Missing Spark On Partner Chainsaw

No Spark In Stihl Chainsaw 180 Reasons AURAMM.RU

What to do if the chain saw does not start

Good afternoon, dear readers and subscribers of my blog! At some inopportune moment, you may find that your chainsaw does not start. But do not rush to immediately take a tool for repair, perhaps you yourself can eliminate this breakdown. I will tell you what to do in cases where the chainsaw does not start, and how to find the right solution to this problem.

We analyze possible reasons breakdowns

Find why the tool cannot be started in the manual itself. But the instruction does not always come.

Although each model has its own characteristics, but in general they are all similar. Therefore, I will tell you about the possible reasons for the breakdown and possible solutions for different tools.

How the mechanism works

Almost all instruments, both foreign (Husqvarna, Makita, Shtil, Partner 350) and Chinese chainsaws, as well as domestic (friendship, Ural), are organized in the same way. Therefore, it is not very difficult to find the reason why the device does not start and do not stop.

There are four elements that can cause problems:

• The fuel for which the carburetor is responsible;
• Grease;
• Air that enters through the air filter;
• A spark whose quality depends on the ignition unit.

They all depend on each other and interact with each other. If any element does not work correctly, the saw stops working.

To begin with, all tools are configured differently. hot and cold. Two commonly used mechanisms are responsible for this process.

Do not forget to see what is written in the user manual. It says that when you turn on, you need to make sure that the emergency stop brake is locked. But to start a saw with a brake is much more difficult, so sometimes it is better not to turn on the brake.

As you can see from the manual, inside the case there is a fuel tank and an engine, and outside. saw section (tire with chain), handle and starter.

First we need to find out exactly how the tool does not start. For example, the saw begins, but immediately catches the eye or loses the power of work, quality cuts.

Possible outages are due to engine problems. But I would not recommend disassembling it immediately. It is better to look for the problem according to the simplest option.

Read the same

It is very important to consider the quality of the fuel. If the mixture is improperly prepared or deteriorates over time, even reliable tools such as Urals or Husqvarna 145 will not work. The instructions should indicate the proportions and the special oil for your chainsaw.

Another common problem. during startup, the user pours a candle. It must be checked if it is completely dry, then the fuel does not go into the cylinder.

NO SPARK IN CHAINSAW, ignition coil replacement / NO SPARK IN THE CHAINSAW, ignition coil replacement

This video discusses the failure of the ignition coil, its replacement and start. chainsaws. And also look mine.

DOES NOT START STihl 170/180. CAUSES.

BASIC CAUSES NO PLANTS ENGINE. NO SPARKS ON THE CANDLE IGNITION (REPLACE CANDLE.

If you see black carbon deposits or a lot of fuel, it is possible that the carburetor incorrectly regulates the fuel supply.

If your sawtooth start starts but stops right away, the problem is finding a carburetor jet or fuel filter. Perhaps they are clogged.

To check if the baffle is damaged, it is necessary to disconnect the fuel hose from the carburetor and see if the fuel mixture flows out of it.

If the saw does not start hot, the problem may be in the muffler. Sometimes it gets clogged from the exhaust.

Quite often, saw breaks occur due to a small amount of chain lubricant. This happens with clogged channels or an oil leak.

Also check the pipe connections with the oil pump nozzles for leaks.

It is very bad when a cylinder malfunction occurs. When checking it, you may find irregularities or chips; this may be the cause of the problem.

We restore the tool

To restore the saw, no matter the brand Ural or Calm, you need to know the location of the deployment.

First, we check and change. If the saw still does not start, we check it further.

The problem is the candle. pull out and dry. In no case do not puncture it, because this will lead to a malfunction of the part. 30 minutes after drying, you can put the candle back before checking to see if any fuel remains in place.

Read the same

In addition, the candle may simply break, so it’s better to get rid of causes.

Another reason the tool is badly damaged and locked. this is a bad contact between the candles and the high voltage wire. If everything is ok here, but sparks still missing, the ignition module itself may break. Such a breakdown can only be eliminated by replacing it.

You should check and clean the air filters from time to time. If you have not tested it since the time of purchase, it could become clogged with dust and cause a malfunction.

Models such as the Calm 180, Ural, or Partner 350 block respite, often resulting in damage. To clean it, you can use a sewing needle.

The Stihl 180, Friendship, Ural and Huskvarna 142 models sometimes clog the muffler, and must also be checked and cleaned.

If the problem is in the carburetor, then without the appropriate experience, you should not try to fix it. It is best to consult a specialist.

If after checking and eliminating the above problems your saw does not start, then most likely the failure is hidden in the cylinder group.

When you see damage and chips on a piston or cylinder, you will have to replace these items.

If the cause of the malfunction of the chainsaw is a plug that leaks, it is likely that insufficient lubricant is being supplied to the circuit. To solve the problem, pipes are replaced only, and the joints are sealed with sealant.

The details of the mechanism cannot last forever, so they will need to be changed periodically. To find out which part, you need to look at the instructions.

Separate breakdown of the most common model

Consider the problems Stihl 180 in more detail:

1. Carburetor clogged or fuel filter. These are the most common problems that are very easily fixed after cleaning. Sometimes the filter needs to be changed;
2. Candle replacement;
3. Sometimes or oil seals.

Saw Stall is strong enough and hardy, so often the breakdown can be eliminated independently. In fact, the same applies to the models of Partner, Ural, Makita and Husqvarna.

If you find a malfunction in your chainsaw, look for a small cause, gradually checking and fixing the problems. Such problems can be easily solved by yourself. But if the breakdown is serious and you do not have enough experience, then this should be done by a specialist.

Related videos

Share articles on social networks and comments. And I say goodbye to you, good luck and see you again!

Read the same

Stihl chainsaw Lost Spark. NZIZN.RU

Chainsaw malfunctions and repairs

Usually, a failure in the operation of chainsaws is caused by a malfunction of the motor or the appearance of breakdowns in its other nodes.

• ignition failure;
• problems in the fuel supply system;
• malfunctions of the piston or cylinder.

In other nodes most often malfunctions arise due to failures of the brake mechanism, lubrication systems, clutch, tire, etc.

Engine malfunctions

The following disadvantages are most often observed in engine operation:

• the engine generally does not start;
• starts, but immediately stalls;
• does not develop suitable power;
• it is unstable.

In order to find the cause of the problem, it is necessary to analyze the likely premises in order by way of exclusion. Let’s go through this chain so that you know how to find a shortage in a chainsaw if it occurs.

Chainsaw ignition system malfunctions

Problems in the ignition system most often become a prerequisite for the failure of a gasoline engine. Therefore, you should begin the search for defects specifically with her.

If slipping spark blue from a distance of 2-3 mm, then everything is in order. If spark arises only at a distance of 0.5. 1 mm, most likely, there were problems with the ignition system. If there is no spark, it is necessary to check the high-voltage cable with a probe. Maybe there was a wire break in it.

No sparks on chainsaw No sparks chainsaw

Does not start chainsaw not sparks a description of all circumstances Cheap products from China

NO SPARK IN CHAINSAW, ignition coil replacement / NO SPARK IN THE CHAINSAW, ignition coil replacement

This video discusses the failure of the ignition coil, its replacement and start chainsaws. And also look mine.

Malfunction of the fuel supply system in the chainsaw

If everything is in order with the ignition system, then go ahead and check the fuel supply system of the chainsaw.

We disconnect the fuel hose from the carburetor and see if fuel flows out of it or not. If the fuel flows in a free stream, then everything is in order. the cover and filter are working properly. If the fuel mixture does not flow at all or flows very weakly, then clean the opening of the cap (breather) with a needle.

Carburetor malfunction

If all the actions described above did not lead to success, perhaps the cause of the inoperability of the chainsaw lies in the malfunction of the carburetor.

Chainsaw silencer malfunction

It often happens that during continuous operation, the walls of the exhaust pipe become covered with soot, which prevents the free exit of exhaust gases.

Malfunctions in the cylinder-piston group

Deterioration of the cylinder and piston, the appearance of scratches and scoring on their surface, wear of the piston rings or crankshaft bearings. all these are very serious damages. As a result, they lead to a drop in pressure in the cylinder. In this case, it will be very difficult to start the engine.

If there is compression, you will feel your finger suck inward.

Malfunctions lubrication systems chains

Each instruction manual indicates the need to monitor the status lubrication systems chains.

Circuit brake malfunction

If the chain brake does not work, the cause may be contamination of the brake band with grease or sawdust with wood resin or underwing space.

You can fix the problem by cleaning the dirt and replacing the brake band.

No Sparks In Chainsaw Reasons AURAMM.RU

Chainsaw repair yourself

Chainsaw malfunctions remain our customer’s faults into two main groups: engine malfunctions with complete non-system components (ignition, fuel supply system, cylinder-piston group, exhaust system) non-malfunctions of other components (chain brake, lubrication system, clutch, tire not etc.).

Engine malfunctions

• The engine will not start;
• Starts up, but stalls;
• unstable;
• does not develop power, i.e. normally runs at idle, but stalls under load.

Carrying out repairs chainsaws yourself, need to act by exclusion. checking one by one our client remains the possible causes of the malfunction, starting with the development of those whose verification and elimination of which takes less time (see here about the device and the two-stroke engine not working).

Ignition system. Almost all types of engine malfunctions listed above can be caused by ignition system malfunctions. Therefore, when they occur, it makes sense to start troubleshooting with a candle. This is all the more justified because the state of the latter can provide useful information about the operation of the fuel system. So, if a problem occurs, you need to turn out the candle and inspect it.

The wire is disconnected, and the candle is twisted with a special key.

If the candle is dry, this means that the problem is most likely not in the ignition system, but in not entering the cylinder fuel mixture. You can wrap the candle back and take up the fuel system. If the candle is heavily sprayed with the fuel mixture, then there is an excess of it. This may occur due to misregistration of the carburetor or violation of the rules for starting. The candle is wiped and dried, the cylinder is drained, cutting off the fuel supply and working as a starter. to vent the combustion chamber and remove excess fuel. Then set the candle in place and repeat the launch.

The presence of a large amount of black soot also indicates a malfunction in the fuel system.

The ratio between oil and gasoline in the mixture may be violated, the carburetor is not adjusted, or poor-quality oil is used. The candle is washed in gasoline, cleaned with a needle or an awl of carbon deposits, clean the electrodes with a fine sandpaper and put in place.

In all these cases, it is not superfluous to check the gap between the electrodes of the candle. Depending on its brand, it should be in the range of 0.5-0.65 mm. It is necessary to check the sealing gasket of the candle. If it is worn or damaged, the tightness of the combustion chamber may not be ensured, which leads to a decrease in compression in the cylinder and problems in the engine.

Even if in the case of checking the spark plug there is good reason to believe that the fault is in the fuel system, you need to check the spark plug for a spark. At least in order to be sure that everything is in order with this. For this:

• put on the spark plug cable;
• using pliers with insulated handles, apply thread or nut to the cylinder;
• pull the starter handle and look. there is spark or she is not.

Read the same

If there is no spark, you just need to replace the candle. If the new candle does not have a spark, it is necessary to check the condition of the high-voltage wire for an open and contact with the candle.

Cause the absence of sparks may also lie in a faulty ignition module or a violation of the gap between it and the flywheel magnetic circuit. It should be 0.2 mm. Violation of the gap becomes especially likely if before that the saw was disassembled with the flywheel and the ignition module removed. The clearance is set using a 0.2 mm thick gasket placed between the flywheel boss and the ignition module. Defective ignition module must be replaced.

Having checked the ignition system in this way and not having detected a malfunction, we can proceed to the fuel mixture supply system.

Fuel supply system. If inspection of the spark plugs found that fuel does not enter the cylinder, you need to consider all the possible reasons for this. It could be:

• non-receipt of fuel from the tank due to a clogged hole in its cap (breather), while a vacuum is created in the tank that prevents fuel from flowing out;
• contamination of the fuel filter installed in the tank;
• not receipt or insufficient supply of fuel mixture from the carburetor to the cylinder.

To diagnose the first two reasons, it is enough to disconnect the fuel hose from the carburetor and see if fuel flows out of it or not. If it flows fully, the breather and filter can not be checked, if it does not or weakly flows, we can assume that the cause of the malfunction is found. The breather is cleaned with a needle. The fuel filter is removed through the filler hole of the empty fuel tank using a wire hook, together with a suction hose from which the filter is disconnected and cleaned or replaced with a new one. Chainsaw manufacturers recommend changing the fuel filter every three months.

NO SPARK IN CHAINSAW, ignition coil replacement / NO SPARK IN THE CHAINSAW, ignition coil replacement

This video discusses the failure of the ignition coil, its replacement and start. chainsaws. And also look mine.

Insufficient intake of the fuel mixture from the carburetor into the cylinder or a violation of the correct ratio between fuel and air mixed in the carburetor can occur for several reasons: due to clogging of the air filter, unregulated carburetor, clogging of its channels or mesh filter.

As a rule, repairing chainsaws is not complete without cleaning the air filter, since it gets dirty quite quickly. When this happens, air intake to the carburetor decreases, the fuel mixture at the outlet of it turns out to be too enriched, which disrupts the normal operation of the engine. Carefully remove the dirty filter for cleaning so that dirt does not get into the carburetor. The filter should be cleaned or washed in water with some detergent, dried and installed again.

Carburetor misregistration is eliminated by its adjustment. This is usually done with three screws. maximum and minimum idle speed and propeller. Adjustment must be carried out in strict accordance with the instructions, non-observance of which can lead to engine damage. Some saw manufacturers leave only one adjusting screw (idle). to exclude unwanted interference by inexperienced users in the carburetor. For an example of adjusting the carburetor of a chainsaw, see the article Working with a chainsaw.

If the carburetor adjustment did not help, you need to clean its channels and filter mesh, and at the same time check the integrity of the membrane. Carburetor. one of the most complex chainsaw devices, so proceed with disassembling and cleaning it with a full understanding of the responsibility of this operation. It consists of many small parts that have the peculiarity of quietly popping out of their seats and irretrievably lost, so that, having disassembled this capricious device, you can not assemble it.

Below is a diagram of another carburetor chainsaw.

If there is no experience and self-confidence, it is better to entrust the repair of a chainsaw carburetor to a service center specialist. Sometimes for high-quality cleaning of the carburetor it is necessary to apply ultrasonic cleaning.

Muffler. Often the cause of engine malfunction, especially in the case when the engine is operating normally at low revs and stalls under load, becomes clogging of the silencer’s spark arrester, which prevents normal exhaust, from the combustion products. Repair in this case consists in removing the muffler, disassembling (if it is collapsible) and wet cleaning it from soot using detergents. The non-separable muffler is dried with a hairdryer after washing. Remember that soot contains substances that are carcinogens, and dry cleaning, which may cause inhalation, is unacceptable. When removing the muffler, the engine outlet is plugged with a clean rag.

Read the same

One of the reasons a muffler may clog. this use fuel mixture with an excess amount of oil (the amount of oil is more than recommended by the manufacturer), and the use of either unsuitable oil or low-quality oil.

Cylinder piston group. Malfunctions of the cylinder-piston group are the most serious. This is the deterioration of the cylinder and piston, scratches and seizures on their surface, wear or sinking in the grooves of the piston rings, wear of the crankshaft bearings. Most of these malfunctions lead to a drop in pressure in the cylinder and, as a consequence, to the inability to start the engine, or its inability to give full power. There are several ways to assess the status of a cylinder-piston group (CPG).

You can remove the muffler and look through the opened window, in which a part of the side surface of the cylinder is visible. Despite the limitations of the review, a general idea of ​​the state of the CPG in this way can still be obtained.

It is useful to measure the compression in the engine, which is quite informative regarding the condition of the parts of the CPG. The operation is carried out using a compressor installed in the candle hole.

The crankshaft is rotated using an electric motor (drill) with a flexible shaft or manually by a starter, while controlling the pressure on the pressure gauge. The last for a workable chainsaw should be at least 8-9 atm (0.8-0.9 MPa). With its decrease, engine power also drops. At a pressure of five atm, the engine may work, and maybe it will, but only at idle.

It is possible to accurately assess the state of the CPG only by completely disassembling the engine. disconnecting the crankcase from the cylinder and removing the piston. If the latter has scuffs, chips or deep scratches, it must be changed. In relation to the cylinder, when developing or damaging the surface, it is possible to squander it under the repair size. The cause of low compression may be wear and coking of the piston ring. The serviceable ring should be clean of carbon deposits, sit in the piston groove freely and firmly pressed against the inner surface of the cylinder.

Chain lubrication system

With a significant (small is considered normal) oil leakage, it is necessary to check the tightness of the connection of the tubes to the pump fittings. They may fall or crack. Violation of the tightness of the oil pipe, in addition to sagging, can lead to insufficient lubrication of the chain. The pump begins to suck in air, which affects its performance. The leak is eliminated by replacing the tubes or sealing them with sealant.

The most serious damage to the lubrication system are cracks in the oil pump housing. In this case, it will have to be replaced.

Chain brake

Replacing Wear Parts

If you do not replace the wearing parts in time, their excessive wear will adversely affect the other parts of the chainsaw. In particular, if you do not change the tire and the drive sprocket in time, increased vibration will adversely affect the crankshaft bearings. The maximum depth of the tooth teeth should be 0.5 mm. In practice, sprockets often operate to a wear depth of one mm or more. not suspecting that this leads to an increased load on the crankshaft bearings and their accelerated failure. When 3-4 chains are worn, it is necessary to change the tire itself, by this time its wear reaches its limit values.

The chainsaw tire wears out especially in the area most often cut, usually. this is the underside of the guide rail. For uniform wear, each time the chain is replaced, the tire must be turned 180 ° relative to the horizontal axis.

When installing a new chain, a new drive sprocket should be installed. Since under normal load the service life of the drive sprocket is twice as long as the service life of the chain, it is advisable to use one sprocket for alternating operation of two chains. Thanks to this, the sprocket and chains wear out almost simultaneously. If a new chain is placed on a worn sprocket, then the leading chain links wear out much faster. For cost-effective operation of the chainsaw, always spend together: one guide bar, two chain sprockets, four saw chains.

Read the same

Why There Is No Spark On AURAMM.RU Chainsaw

DIY chainsaw repair

All malfunctions of chainsaws can be divided into two main groups: problems of the engine with all its components and systems (ignition, fuel supply system, cylinder-piston group, exhaust system) and malfunctions of other components (chain brake, lubrication system, clutch, tire, etc.).

Engine malfunctions

• the engine will not start;
• Starts up, but stalls;
• it is unstable;
• does not develop power, i.e. normally works at idle, but stalls under load.

When repairing a chainsaw with your own hands, it is necessary to act as an exception — to inspect alternately all the possible causes of the malfunction, starting with those that take the least time to check and eliminate (see here for the design and operation of a two-stroke motor).

Ignition system. Almost all types of engine malfunctions listed above can be caused by ignition system malfunctions. Therefore, when they occur, it makes sense to start troubleshooting with a candle. This is all the more justified because the state of the latter can provide useful information about the operation of the fuel system. So, if a problem occurs, you need to turn out the candle and inspect it.

The wire is disconnected, and the candle is twisted with a special key.

If the candle is dry, it means that the problem is most likely not in the ignition system, but in the fuel mixture not entering the cylinder. You can wrap the candle back and take up the fuel system. If the candle is heavily sprayed with the fuel mixture, then there is an excess of it. This may occur due to misregistration of the carburetor or violation of the rules for starting. The candle is wiped and dried, the cylinder is drained, cutting off the fuel supply and working as a starter to ventilate the combustion chamber and remove excess fuel. Why is there no spark on a chainsaw? Then set the candle in place and repeat the launch.

The presence of a large amount of black soot also indicates a malfunction in the fuel system.

The ratio between oil and gasoline in the mixture may be violated, the carburetor is not adjusted, or poor-quality oil is used. The candle is washed in gasoline, cleaned with a needle or an awl of carbon deposits, clean the electrodes with a fine sandpaper and put in place.

In all these cases, it is not superfluous to check the gap between the electrodes of the candle. Depending on its brand, it should be in the range of 0.5-0.65 mm. It is necessary to check the sealing gasket of the candle. chainsaw no spark no description no spark on the chainsaw no why. If it is worn or damaged, the tightness of the combustion chamber may not be ensured, which leads to a decrease in compression in the cylinder and problems in the engine.

Even if in the case of checking the spark plug there is good reason to believe that the fault is in the fuel system, you need to check the spark plug for a spark. At least in order to be sure that everything is in order with this. For this:

• put on the spark plug cable;
• using pliers with insulated handles, apply thread or nut to the cylinder;
• pull the starter handle and see if there is a spark or not.

If there is no spark, you just need to replace the candle. If the new candle does not have a spark, it is necessary to check the condition of the high-voltage wire for an open and contact with the candle.

Read the same

The reason for the absence of a spark can also be a faulty ignition module or a violation of the gap between it and the flywheel magnetic circuit. It should be 0.2 mm. Violation of the gap becomes especially likely if before that the saw was disassembled with the flywheel and the ignition module removed. The clearance is set using a 0.2 mm thick gasket placed between the flywheel boss and the ignition module. Defective ignition module must be replaced.

Having checked the ignition system in this way and not having detected a malfunction, we can proceed to the fuel mixture supply system.

Fuel supply system. If inspection of the spark plugs found that fuel does not enter the cylinder, you need to consider all the possible reasons for this. It could be:

• non-receipt of fuel from the tank due to a clogged hole in its cap (breather), while a vacuum is created in the tank that prevents fuel from flowing out;
• contamination of the fuel filter installed in the tank;
• not receipt or insufficient supply of fuel mixture from the carburetor to the cylinder.

To diagnose the first two reasons, it is enough to disconnect the fuel hose from the carburetor and see if fuel flows out of it or not. If it flows fully, the breather and filter can not be checked, if it does not or weakly flows, we can assume that the cause of the malfunction is found. The breather is cleaned with a needle. The fuel filter is removed through the filler hole of the empty fuel tank using a wire hook, together with a suction hose from which the filter is disconnected and cleaned or replaced with a new one. Chainsaw manufacturers recommend changing the fuel filter every 3 months.

No sparks on chainsaw No sparks chainsaw

NO SPARK IN CHAINSAW, ignition coil replacement / NO SPARK IN THE CHAINSAW, ignition coil replacement

This video discusses the failure of the ignition coil, its replacement and start. chainsaws. And also look mine.

Insufficient intake of the fuel mixture from the carburetor into the cylinder or a violation of the correct ratio between fuel and air mixed in the carburetor can occur for several reasons: due to clogging of the air filter, unregulated carburetor, clogging of its channels or mesh filter.

As a rule, repairing chainsaws is not complete without cleaning the air filter, since it gets dirty quite quickly. When this happens, air intake to the carburetor decreases, the fuel mixture at the outlet of it turns out to be too enriched, which disrupts the normal operation of the engine. Carefully remove the dirty filter for cleaning so that dirt does not get into the carburetor. The filter should be cleaned or washed in water with some detergent, dried and installed again.

Carburetor misregistration is eliminated by its adjustment. Usually this is done with three screws. maximum and minimum speed and idle screw. Adjustment must be carried out in strict accordance with the instructions, non-observance of which can lead to engine damage. Some manufacturers of saws leave only one adjustment screw (idle speed). to exclude unwanted interference of inexperienced users in the operation of the carburetor. No sparks on chainsaw no sparks chainsaw. youtube. For an example of adjusting the carburetor of a chainsaw, see the article Working with a chainsaw.

If the carburetor adjustment did not help, you need to clean its channels and filter mesh, and at the same time check the integrity of the membrane. A carburetor is one of the most complex chainsaw devices, so you need to start disassembling and cleaning it with a full understanding of the responsibility of this operation. It consists of many small parts that have the peculiarity of quietly popping out of their seats and irretrievably lost, so that, having disassembled this capricious device, you can not assemble it.

Below is a diagram of another carburetor chainsaw.

If there is no experience and self-confidence, it is better to entrust the repair of a chainsaw carburetor to a service center specialist. Sometimes for high-quality cleaning of the carburetor it is necessary to apply ultrasonic cleaning.

Muffler. why is there no spark on a chainsaw? Get expert answers for free! Often the cause of engine malfunction, especially in the case when the engine is operating normally at low revs and stalls under load, becomes clogging of the silencer’s spark arrester, which prevents normal exhaust, from the combustion products. Repair in this case consists in removing the muffler, disassembling (if it is collapsible) and wet cleaning it from soot using detergents. The non-separable muffler is dried with a hairdryer after washing. Remember that soot contains substances that are carcinogens, and dry cleaning, which may cause inhalation, is unacceptable. When removing the muffler, the engine outlet is plugged with a clean rag.

Video: Missing Spark On Partner Chainsaw

Read the same

One of the reasons that the silencer may become clogged is the use of a fuel mixture with excess oil (the amount of oil is more than the manufacturer recommends), and the use of oil that is not suitable for two-stroke engines or low-quality oil.

Cylinder piston group. Malfunctions of the cylinder-piston group are the most serious. This is the deterioration of the cylinder and piston, scratches and seizures on their surface, wear or sinking in the grooves of the piston rings, wear of the crankshaft bearings. Most of these malfunctions lead to a drop in pressure in the cylinder and, as a consequence, to the inability to start the engine, or its inability to give full power. There are several ways to assess the status of a cylinder-piston group (CPG).

You can remove the muffler and look through the opened window, in which a part of the side surface of the cylinder is visible. Despite the limitations of the review, a general idea of ​​the state of the CPG in this way can still be obtained.

It is useful to measure the compression in the engine, which is quite informative regarding the condition of the parts of the CPG. The operation is carried out using a compressor installed in the candle hole.

The crankshaft is rotated using an electric motor (drill) with a flexible shaft or manually by a starter, while controlling the pressure on the pressure gauge. No spark in the chainsaw, ignition coil replacement no spark in the chainsaw, ignition coil replacement no spark on the chainsaw no sparks chainsaw chainsaw search for sparks on the chainsaw, the spark disappeared. The last for a workable chainsaw should be at least 8-9 atm (0.8-0.9 MPa). With its decrease, engine power also drops. At a pressure of 5 atm, the engine may perhaps work, but only at idle.

It is possible to accurately assess the condition of the CPG only by completely disassembling the engine. by disconnecting the crankcase from the cylinder and removing the piston. If the latter has scuffs, chips or deep scratches, it must be changed. In relation to the cylinder, when developing or damaging the surface, it is possible to squander it under the repair size. The cause of low compression may be wear and coking of the piston ring. The serviceable ring should be clean of carbon deposits, sit in the piston groove freely and firmly pressed against the inner surface of the cylinder.

Chain lubrication system

With a significant (small is considered normal) oil leakage, it is necessary to check the tightness of the connection of the tubes to the pump fittings. They may fall or crack. Violation of the tightness of the oil pipe, in addition to sagging, can lead to insufficient lubrication of the chain. The pump begins to suck in air, which affects its performance. No spark on chainsaw | video on Zaporizhzhya. The leak is eliminated by replacing the tubes or sealing them with sealant.

The most serious damage to the lubrication system are cracks in the oil pump housing. In this case, it will have to be replaced.

Chain brake

Replacing Wear Parts

If you do not replace the wearing parts in time, their excessive wear will adversely affect the other parts of the chainsaw. In particular, if you do not change the tire and the drive sprocket in time, increased vibration will adversely affect the crankshaft bearings. The maximum depth of the tooth teeth should be 0.5 mm. In practice, sprockets are often operated up to a wear depth of 1 mm or more, without suspecting that this leads to an increased load on the crankshaft bearings and their accelerated failure. When 3-4 chains are worn, it is necessary to change the tire itself, by this time its wear reaches its limit values.

The chainsaw tire wears out especially in the area that is cut most often, usually the underside of the guide bar. For uniform wear, each time the chain is replaced, the tire must be turned 180 ° relative to the horizontal axis.

When installing a new chain, a new drive sprocket should be installed. Since under normal load the service life of the drive sprocket is twice as long as the service life of the chain, it is advisable to use one sprocket for alternating operation of two chains. Thanks to this, the sprocket and chains wear out almost simultaneously. If a new chain is placed on a worn sprocket, then the leading chain links wear out much faster. For cost-effective operation of the chainsaw, always spend together: one guide bar, two chain sprockets, four saw chains.

Read the same

Why the chainsaw does not start. the search for causes and ways to eliminate them

Amateur and professional chainsaws are complex devices. The engine life of their two-stroke engines, components and assemblies has its limitations. For this reason, quite reliable and expensive tools along with cheap Chinese units periodically fail and refuse to start. The situation when the chainsaw does not start or stalls is not very pleasant and sometimes confuses the user. How to identify and fix a malfunction by returning the instrument to working condition.

Identification and elimination of obvious malfunctions of the chainsaw.

To determine the reason why when starting the chainsaw does not start or stalls, it is necessary to carry out a defect of the tool. The essence of the procedure is the sequential inspection of the state and operation of the main working elements of the saw engine. At this stage, we check:

• The presence of sparks on the spark plug;
• Fuel supply;
• State of filters;
• The operation of the breather of the stalling unit integrated in the fuel cap;
• The functioning of the exhaust channel.

Check spark on spark plug and eliminate causes.

The first step in finding the reasons why the gasoline saw does not start is to check the spark on the spark plug. There are many factors that influence the operation of this element. However, the main ones at the initial stage of instrument troubleshooting are:

• Incorrect carburetor adjustment;
• The presence of more than expected oil in gasoline;
• Clogged air filter.

All of them contribute to the formation of carbon deposits on the electrodes of the candle. In 50 out of 100 cases, the saws do not start up cold due to the lack of spark due to deposits of carbon deposits on the electrodes and their corrosion. As a result, there is either a decrease in the gap or an increase in it.

Checking the spark plug for an idle chainsaw

Checking for a spark is pretty simple. This will require:

• Remove the tip of the high voltage wire;
• Unscrew the candle;
• Put the tip back;
• Lean the candle with the skirt against the cylinder;
• Start with starter.

If a good spark is observed between the electrodes at the time of starting the chainsaw engine, then everything is in order with the ignition unit. If it is not there, then it is worth cleaning the element itself and checking the electrode gap. If necessary, use a special probe to adjust the distance between the contacts.

For candles of different manufacturers, the distance between the electrodes can fluctuate. In some, it can be equal to 0.5 mm. Others have 0.2 mm. Therefore, carefully read the manufacturer’s recommendations.

Sparks on the spark plug may not be for other reasons. Of the main malfunctions that affect the poor start of the chainsaw and the unstable operation of the internal combustion engine at idle, from which the tool can stall, the following can be attributed:

• Overfill of the candle channel with fuel;
• Lack of contact between the high-voltage cradle and the tip of the candle;
• Failure of the ignition unit.

How to start a cold chainsaw, if the candle channel is constantly filled with gasoline? To fix the problem at the time of starting the tool, you can use the following algorithm:

• Unscrew the candle with a special key;
• Wipe it with a clean and dry rag;
• Dry for 20. 30 minutes;
• Remove the soot with a file and adjust the gap between the electrodes;
• Drain the remaining fuel from the candle channel and dry it;
• Collect everything and try to start the mechanism.

As a rule, these measures are enough to start the chainsaw and do the work. However, this extreme measure does not eliminate the main reason why the engine does not start or stalls. the carburetor is not working properly, which needs to be finely tuned.

If there is no spark due to poor contact between the high-voltage cradle and the tip of the spark plug, check the connection. Verification can be carried out using a conventional tester. If a defect is found and corrected, the chainsaw should start without any problems.

If the check shows that the contact is reliable, and the saw does not start further, look for the cause in the ignition unit. As a rule, a faulty unit cannot be repaired or repaired. It will require a complete replacement.

We determine the availability of fuel and its supply.

First you need to make sure that in the tank of the chainsaw that does not want to start, there is a fuel mixture, and it regularly enters the carburetor. With a full tank, we check how the mixture is fed through a gas line. Disconnect the fuel system pipe from the carburetor and try to pump up. In the case of a complete order, when pumping, gasoline will be supplied in jerks in accordance with the standards set by the manufacturer. Poor fuel supply or lack thereof may result:

• The fuel supply channel is clogged;
• Clogged fuel filter.

Often the cause of a poor start of the chainsaw can be too full a tank. In this case, pay attention to the presence of smudges under the cover of the saw case. If they are present, then see the connection of the gas pipe to the carburetor. Most often, it is squeezed out by pressure when tightening the cap of the tank, tucked under the very neck, which prevents the engine from starting up.

The quality of the fuel mixture can also be one of the reasons why the chainsaw does not start. If, after completing the work, the gasoline residues are not drained and the instrument is left for long-term storage (more than 2 weeks), then resin formation and polymerisation of the components will begin to occur inside the tank. What can cause carbon deposits on the piston, rings and cylinder liner. Therefore, always before cooking, prepare the mixture only in the required quantity.

Checking the condition of the fuel and air filters.

If everything is in order with the fuel quality, the chainsaw engine may not start because of clogged fuel and air filters. To diagnose these elements, a number of manipulations related to their dismantling will be required.

For fuel filter:

1. Disconnect the gas supply channel from the carburetor;
2. Pump up fuel.

If the pressure is weak or absent, the filter should be disconnected. Before this, empty the tank from the mixture and remove the filter element itself. Dismantling is carried out by means of a wire hook. A clogged replacement cartridge that has caused poor engine start-ups can be cleaned, but it is best to replace it with a new one. When using the tool in dusty conditions, cleaning should be done on a regular basis.

A clogged air filter can lead to unstable operation of the chainsaw engine, which will make it stall or difficult to start. Dust and dirt deposited on the absorbent material make it difficult for air to enter the system, make the fuel mixture so enriched that it can be difficult to start the tool.

Checking the air filter is one of the first steps in finding the causes of a poor start.

Removing the air filter should be done with caution, since dust accumulated during the operation of the saw on its surface can get into the carburetor. And this is fraught with more expensive repairs. After detaching the cartridge, thoroughly clean it of accumulated dirt and rinse with detergent. Dry the element and put it back in place as well.

Check the breather and clean it.

The breather is another element from the malfunction of which the chainsaw may not start or stall during sawing. This item is located on the fuel cap in the area of ​​the air hole. This is a kind of valve that does not allow gasoline to flow out and equalizes the air pressure necessary for the free flow of fuel into the carburetor.

In case of contamination of the breather, the working chainsaw stalls, and at startup it refuses to start. The thing is that through the hole air stops flowing. As a result, a negative pressure (vacuum) is created inside the fuel tank, which prevents the flow of gasoline to the carburetor.

Identifying the problem is quite simple. Disconnect the fuel supply hose from the carburetor and see what happens to gasoline. If it flows smoothly with a good stream, then the breather is all right. If it is absent or it flows weakly and intermittently, then the reason is identified. the breather is clogged with dirt. You can solve the problem by cleaning the air hole with a regular needle or a powerful jet of compressed air.

Checking the outlet of the chainsaw.

One of the reasons that the chainsaw starts poorly may be the clogging of the exhaust duct or its muffler. At the same time, a drop in power is observed in the process of sawing lumber and logs. Most often, this occurs due to tarry deposits on the spark catcher or the silencer channel, which are formed during the combustion of a poor-quality mixture of gasoline and oil, which interferes with exhaust gases.

Clogged resonator can cause poor start of gasoline saw

To eliminate the cause of a poor start of the chainsaw, in this case, you can remove the accumulated combustion products. To do this, perform a series of manipulations:

• Remove the muffler by unscrewing the screws;
• Remove the cooling panel and gasket;
• Remove the spark arrester;
• Disassemble the resonator housing;
• Wash all elements from soot with detergent;
• Let them dry completely;
• Assemble everything in reverse order;

To prevent dust and sand from entering the cylinder when the muffler is being cleaned, close the exhaust duct of the chainsaw engine with a clean rag.

What to do if the chainsaw does not start further?

If the initial inspection did not give anything or the defects in the search process were eliminated, and the chainsaw does not start further, then you need to look for more serious reasons. It is best to identify and fix such breakdowns in the service center. However, if you have experience, you can find and eliminate them yourself. What to diagnose and check?

1. Compression in the cylinder;
2. Compression in the crankcase;
3. Carburetor operation.

In the first case, checking the compression in the cylinder will make it possible to find out the state of the cylinder-piston group (CPG) of the chainsaw that does not want to start on a cold one. To do this, you need a compressor. The device is screwed into place of the spark plug and the engine is idle. Measurement of testimony allows you to judge the state of the CPG. In the absence of a compressor, the compression in the cylinder can be determined offhand as follows:

• Put your finger on the candle hole;
• Try to start the chainsaw engine.

By putting a finger on the spark plug hole and pulling the starter, you can check the compression in the cylinder

If you feel that the finger pulls strongly into the candle channel, then the compression is all right. The lack of vacuum in the chamber indicates a malfunction. The cylinder-piston group needs a more detailed inspection, which will give an idea of ​​the condition of the piston and cylinder, piston rings and bearings.

Do not start the chainsaw in the cold and may be due to the lack of compression in the crankcase. The main reason for this is damage to the gasket located between the cylinder and the crankcase. Detecting the lack of compression is pretty easy:

• Disconnect the upper tube from the carburetor;
• Pour gasoline into an ordinary cork;
• We load the removed tube into the fuel;
• We pull the starter several times.

If the fuel from the cap is sucked up when the chainsaw starter is started, then the compression is all right. If not, see the gasket.

If the fuel is drawn in, then everything in the lock. the gasket is intact. Otherwise, you will have to purchase a repair kit and make a replacement. How to do this, watch the video why the Chinese chainsaw does not start:

Starting the tool can be complicated by improper operation of the carburetor or its breakdown. It often happens that during the sawing process, the fixing screws loosen and air is sucked into the cylinder. Check that the carburetor is securely fastened. Inspect it for fuel leaks. The causes of the malfunction may be a mass. Accurately determine the malfunction, eliminate it and fine-tune the carburetor is possible only in the service center.

After a step-by-step troubleshooting of the chainsaw engine, you can find the malfunction, fix it yourself and successfully start your working tool. Do not take on those types of work in which you are not sure. Entrust troubleshooting to specialists from the service center.

Causes and descriptions of Stihl chainsaw breakdowns

There is no such master who would refuse his own chainsaws. An extremely useful tool. in skillful hands it performs many tasks. Did you know that carving, or woodcarving with a chainsaw, is a popular art form? But in everyday life, a chainsaw is very necessary. Therefore, when choosing a tool, do not save, but choose a reliable manufacturer.

For instance, German brand Stihl (Stihl) more than 90 years in deserved trust and demand. Under this brand, Stihl motorized equipment and gasoline for chainsaw are produced.

The world’s first hand-held saw with a motor appeared in 1926, and was created by German mechanic Andreas Stihl. Since then, Stihl equipment has not left the list of the most reliable equipment in the world. Therefore, if the Stihl chainsaw does not start, the reason must be serious. But this does not mean that it is insoluble.

Stihl chainsaw, description and features

Chainsaw, or a chainsaw, driven by an internal combustion engine. At the same time, you need to know that the chainsaw is not filled with clean gasoline. The fuel used is a mixture of oil and gasoline in different proportions (depending on brand).

This information is contained in the factory instructions, to read which is advisable in advance, and not only after the shtil chainsaw has broken. And the saw of this brand, believe me, will not break because of a trifle. This applies to any model that is classified as follows:

1. Professional saw. It is distinguished by power and endurance. This technique can work without breakdown for 15 hours a day. The price of the “Stihl” chainsaw in this class is appropriate.
2. Semi-professional saw. A universal tool that is often used in the woodworking industry.
3. Hobby saw, or household. Low power (about 2.6 watts) and endurance (about 20-30 hours a week). This is quite enough for everyday tasks like cutting bushes and trees, harvesting brushwood.

Among Stihl chain saws the most common household model is the “Stihl 180”. It is equipped with a small gasoline and oil tank (0.25 liter and 0.145 liter respectively) and weighs less than 4 kg. Compact and relatively lightweight, the STIHL 180 chainsaw produces a noise of only 98 dB, so your neighbors in the country will not be outraged.

Two stroke engine It copes with household load. This is a great workhorse for your household. True, sometimes she can "blubber."

Typical Stihl Chainsaw Breakdowns

Stihl chainsaw owners 180 unanimously recognize her as a good and reliable technique. But they also call several problems that most often occur with this chainsaw:

• Oil leakage, designed for chain lubrication. Because of what: at the junction of the hose from the oil tank and oil pump, the tightness is broken. As a result, the pump draws air instead of oil. How to fix: disassemble the chainsaw for details. The hose can be replaced or just tightened using silicone glue.
• Chainsaw won’t start. Because of what: a valve designed to equalize the pressure in the gas tank during fuel production, clogged and does not fulfill its function. A vacuum is formed inside the gas tank, which prevents the supply of fuel. How to fix: open and close the gas tank cover, vent the combustion chamber. Remove the candle and dry it. Carefully clean the breather with a thin needle.
• Candle needs to be restored. If it has not yet fulfilled its useful life, you can fix it yourself. First, be sure to remove all remaining fuel from the tank. Take out the candle and leave it outdoors, in a dry place, but without direct sunlight. The candle will dry for about a day, or at least 12-16 hours. After that, you can return it to its place. Important: do not try to light a candle. Such advice can be found in some outdated directories, but for modern models, calcination will simply ruin the part.
• First aid, if the Stihl chainsaw is out of order. Try to apply these tips. in most cases they turn out to be effective. And if not, read on. We will consider possible problems in more detail.

Read about the varieties of caladium with us.

How to plant and care for incense? With these recommendations. easy.

Why won’t a chainsaw start?

The biggest nuisance that can happen is when chainsaw does not start at all. In this case, it is not clear what the cause of the breakdown is. There are several typical situations, and most likely one of them is your case:

1. A chainsaw will not start because there is no spark. To achieve ignition, first take out and check the spark plug. it may be filled. Then allow air to enter the gas tank. just open its lid, wait 5 minutes and close it again. Finally, direct a stream of cool air (ventilation) to the combustion chamber. If the problem is small, then you can assume that you have already solved it. A chainsaw will start without problems.
2. The chainsaw does not start, although there is a spark. Perhaps the candle is completely out of order and needs to be replaced. At the same time, check the condition of the air filter. All these details affect the pressure in the gas tank. Under normal conditions, a valve called a breather is responsible for maintaining even pressure. A defective spark plug and / or air filter will cause it to become contaminated. Accordingly, when gasoline is produced, pressure is disturbed, fuel does not arrive on time, and a vacuum chamber forms in the gas tank. The problem seems big, but in practice, to solve it, you just need to remove the mud plug that interferes with the breather. A thin long needle is a suitable tool for cleaning the breather and restoring the performance of a chainsaw.
3. The chainsaw does not start, although it started yesterday. Make sure that there is enough lubrication on the chain. It may not come in the right amount due to a plug in the oil hose. Or vice versa, a crack has formed in the hose and oil flows out before reaching the destination.
4. The chainsaw starts up briefly and immediately stalls. This symptom is similar to a carb malfunction. But before you repair it, make sure that the problem is not the same as described in the previous paragraph, and its fault is not the breather. Disconnect the fuel hose from the carburetor. See if Gasoline is leaking for a Stihl chainsaw? Try to clean the carburetor, it could well become clogged.
5. The chainsaw starts and soon shuts down spontaneously. Make sure the cylinder is working. During the self-diagnosis of the saw you should be guarded by cracks, chips and other similar defects.

As you can see, in most cases, if a Stihl chainsaw breaks, you can fix the problem yourself. But don’t be too presumptuous! If you did not find a suitable description in this article, then it is better to contact a service center.

Professional craftsmen will probably diagnose why the Stihl chainsaw does not start, and they will fix it in a qualified manner. Let your equipment work without problems!

By the way, if you need to repair a Partner (Partner 350) chainsaw, which is as popular as Stihl, you can read more about this in the next article.

And for those who like to know more, we suggest that you familiarize yourself with the video about the Stihl chainsaw repair

Repair chainsaw ignition unit | Lumberjack

We continue the topic of chainsaw repairs and today we will study malfunctions of the ignition unit.

I want to remind readers of the blog that we are primarily concerned with issues related to instrument malfunctions that arose during work on the cutting area. How to be a lumberjack when his main tool stopped working when felling, bucking or pruning?

I must say right away that in the field it is impossible to repair the ignition module. only a replacement for a new part! The only solution to the problem is to have a spare ignition module with you. With a high degree of probability, I assume that you will respond to this statement negatively, to put it mildly, with a slight irony. "What nonsense, buy an ignition module and carry it with you!". But, once again I remind you that this article is for lumberjacks, many of whom work on a shift. First of all, this problem is relevant for "logger-kalymshchikov" who work with their own tool and negotiated with the employer the conditions, indicating the fact that the tool and repairs at their own expense. Such details of the contract may be included in the calculation of the piece rate for the work, therefore, in the case of force majeure, they can have a different effect on the result of such a “Partnership”.

Nevertheless, I propose to consider issues related to malfunction of ignition of a chainsaw in order to be able to at least diagnose this breakdown. As for the other parts of the ignition. magneto (I mean the flywheel), armored wire, candle, the malfunction can be eliminated directly by the lumberjack

A little about contact and electronic ignition

When I started working in the leshoz, in the late 90s, we fell down the old Urals, and mowed Huskvarna 262. The forest was solid, so the buckler only managed to divide the whips into ridges an endless stream of bundles. Ignition in the Urals was no longer fist (contact), but electronic. By the way, for beginner lumberjacks, who did not encounter contact ignition, but who are interested, I want to briefly clarify the old form of ignition.

The cam contact ignition on old models of chainsaws ("Friendship", "Ural") was simple, and most importantly, it had no electronics (various electronic circuit boards) in its design. The "cams" worked as a breaker, and a high-voltage coil supplied current. Any experienced person could fix the ignition problem at that time. lumberjack for short working hours. However, the ignition was too often “covered”. The disadvantage of cam ignition was the “open” spark, which negatively affected the metal contacts themselves. over time they were covered with soot, the layer of which grew and the spark worsened and disappeared. I had to clean the contacts, set the gap again. Another argument against cam ignition is a larger size and more weight than electronic (this comparison is relevant for modern gearless saws).

Electronic ignition, in turn, is a module, which includes not only the coil, but also the electronic board. On the first Urals with electronic ignition, as far as I remember, the electronic board was filled with mica (epoxy), which, in case of repair, was melted and the board was removed. Later they began to use sealant. Although it is difficult to call a board, since these are separate radio components. a triac, diodes, a capacitor, a resistor. There were two coils. high-voltage and low-voltage, which were located against each other. Under the low-voltage coil was still an additional coil (spark), which "carved a spark." Honestly, we never repaired electronic ignition in the Urals and handed over to the local wood processing complex to the electromechanical workshop, where we were resuscitated to it in a short time.

Modern chainsaw ignition

Ignition, on modern gearless chainsaws, is a module, which includes a coil, the electronic board is a transistor type. The ignition system (non-electronic part) includes a flywheel with magnets (magneto), a glow plug, an armored wire (high voltage wire).

What is inside the ignition module?

Perhaps someone watched videos on video hosting and watched the module in the context. I bring the frames for viewing from this video below.

This is how the ignition coil looks in a half-sawed module

On the other side of the coil there is an electronic board, intensively filled with sealant

Most likely, you can “ring” a board and a coil in a module. To do this, you need a "manual". the electrical circuit of a specific model of a chainsaw. But this procedure will only help to find out the "diagnosis", confirm the functionality of the module or the lack thereof. It is impossible to repair such a module on your own, as you understand, both in field or field conditions, and in services.

Therefore, we, lumberjacks, must first of all be able to find a malfunction in the ignition. if it comes down to a breakdown of the module, then it should be replaced. If the malfunction is diagnosed in other parts of the ignition, we eliminate them. It is possible to check the malfunction of the ignition module without its “ringing”.

The main parts of the ignition of a chainsaw

We proceed directly to the main ignition units of a gearless chainsaw. I will list the parts of the ignition system:

• Flywheel with magnets (magneto)
• Ignition module
• Glow plug
• Armored wire (high voltage wire)
• Short circuit wires (on-off)

Here I call the flywheel. magneto. In fact, magneto is the general name for the entire generator, and not specifically the flywheel with magnets. Therefore, do not focus on my habit of calling, in this case, “things are not by their proper names”)).

What is a flywheel? For beginner lumberjacks, I will explain that visually it resembles a huge (precisely in a chainsaw) gear-fan made of duralumin, the blades of which, during rotation, play, first of all, the role of engine cooling. A flywheel is installed on the left side of the chainsaw, right behind the starter cover. The flywheel is mounted by landing on the crankshaft with a key and on two studs. A thread is cut at the end of the shaft to fix the flywheel with a nut. This nut must be tightly tightened when installing the flywheel, otherwise it may cut off the key, which eliminates backlash. By the way, the key is located on the crankshaft so that when the magnets correspond to the core of the ignition module, the piston was at the appropriate level (top dead center) for cutting the spark and igniting the fuel.

From the end of the flywheel, among the blades, massive magnets with different north-south polarity are installed. As a rule, two magnets are installed, but on some models of chainsaws there may be more of them. Opposite them, on the other side of the flywheel, counterweights are installed for uniform rotation.

Massive magnets with different north-south polarity, which create a magnetic field when the flywheel rotates

A ignition module is installed near a magneto (flywheel) at a certain distance (gap) (a coil with an electronic board in a polymer or textolite “shirt” on a plate metal core, which also serves as a mount to the saw body). The ignition module can be installed from different sides. to the right of the magneto (flywheel), to the left or top. depends on the model of the chainsaw.

Husqvarna ignition module with high voltage wire

On-off wires (breaker) and a cable (armored wire) are mounted from the module (coil), mounted in the cap, where the glow plug is inserted. The on-off wires have a small cross section, in contrast to the candle cable, along which high voltage moves. The candle has a lateral and central electrode, a housing and, accordingly, an insulator. A candle is screwed into the cylinder head and transmits a spark to ignite the fuel mixture in the internal combustion engine.

Work of ignition of a chainsaw

We will learn how electronic ignition works on a modern gearless chainsaw.

When the operator makes a jerk of the starter, the ratchet engages with the “dogs” on the flywheel, bringing it into rotation with the crankshaft. The magnets on the flywheel, passing the rotation, act on the iron plate core of the ignition module. This effect is a magnetic field. Due to the magnetic field, the low-voltage winding in the coil forms an electromotive force and transfers a high voltage to the cable through the high-voltage winding. The electronic board in the module is configured to generate a certain frequency of voltage, necessary for this particular model of chainsaw, or to be more precise, all the characteristics of the internal combustion engine.

The converted high voltage is supplied by the module through the cable to the glow plug, where a spark is cut out between the electrodes. The spark, as we know, ignites the fuel mixture and drives the piston, the internal combustion engine and, accordingly, the operation of the entire tool.

Ignition troubleshooting

It is very important for a lumberjack to make a correct diagnosis when his sawing tool begins to “mope” or “falls into a coma”. This, I repeat again, is extremely important, because the consequences of an incorrect diagnosis can lead to unreasonable expenses, wasted time and even nervous breakdowns.

The fact is that inexperienced lumberjacks are often associated with the failure of a chainsaw with a carburetor malfunction. Indeed, in wet or snowy weather with intensive work in the cutting area, some signs of a chainsaw failure with a carburetor malfunction can be correlated. If at the same time the “vagaries” of the carburetor were systematically observed, the prerequisites for a fault diagnosis error only increase. The operator begins to unsuccessfully adjust the carburetor, clean, blow and dry it. Even worse, if he is convinced of his innocence and decides to purchase a new carburetor. But by the way, a spare carburetor will not be superfluous)).

To immediately avoid such a mistake, you just need to check the spark on the candle. In general, in order to exclude any malfunction in the ignition system, it is necessary to start with checking the spark on the candle. Trite and simple! But for some reason, some lumberjacks began to ignore such a procedure and climb into the carburetor. Though…

How to check a candle

It is not worth eliminating a malfunction of the glow plug itself. Nowadays, there are a lot of falsified fuel for chainsaws. A low-quality mixture directly affects the "lifespan" of a glow plug.

We unscrew the glow plug from the engine and carefully examine it. if it is wet, then it is poured with the fuel mixture and, indeed, the carburetor may be the cause of the malfunction. If the candle is dry, then it is necessary to check for a spark. The defective candle should immediately be removed and replaced with a known-good candle.

Visually, a candle defect can be guessed by the following signs:

• layering or deposits (slag, varnish) on the electrodes;
• heterogeneous color and shape of the electrodes;
• carbon black plaque, oily plaque;
• molten central electrode;

First, make sure that the ignition key, when checking, is on. Exactly. It happens that the operator, drowning intermittently working saw, begins to check the spark plug on the ignition off.

The unscrewed (working) glow plug, without removing from the cap, must be threaded (with a "skirt") or with the side electrode directly to the cylinder. Contact must be reliable! Holding the candle by the cap with one hand, with the other hand we make a jerk of the starter and observe the presence of a spark on the candle between the electrodes.

High voltage wire

With proper ignition, there is either a spark or it does not exist at all. If the spark is weak, then the fault should be sought in the candle itself, or in the power cable (armored wire. high voltage wire). In rare cases, if a weak spark of a candle is observed with repeated replacements of serviceable candles, then a malfunction is still present in the ignition module. In this case, when the tool is operating, the faulty module heats up.

It is very rare, but it happens that a high-voltage wire is broken (from personal experience), in the case of mechanical stress and in case of overheating. A spark from a damaged cable breaks through to ground (per cylinder). a short circuit occurs and engine operation stops due to lack of ignition. In this case, it (armored wire) must be replaced. How to check the serviceability of the wire? Only a temporary replacement. an analogue from another working chainsaw. Or a barbaric way for your health. to hold the wire with your fingers when checking. I hope that the lumberjack has enough "intelligence", and he does not, therefore, begin to check the serviceability of the cable.

By the way, if the cap is broken (breaks through), then when checking the spark on the candle, when you hold the cap with your fingers, the malfunction will be revealed immediately)). Such a breakdown of the candle cap is usually detected in wet weather.

It also happens that the cap of the candle is not broken, but the malfunction is contained inside the cap. poor-quality (or lack thereof) connection of the cable with the landing spring, on which the glow plug is mounted. The cause of such a malfunction is the negligence of the user of the tool, which often pulls the cable from the candle, avoiding careful removal.

Ignition wires

Usually the wires for turning on / off the ignition are paired. one to ground, the other from the coil to the Stop-Start button. When they are closed, the ignition disappears and the chainsaw stalls. Although the wire may be one.

In my practice (experience) this wire was damaged.

How did this happen?

Because of his negligence and inexperience. When installing the starter, on Huskvarnaya, I did not lay the wire in the landing grooves on the deflector and it lay on the edges of the grooves. When I fixed the lid, the wire “crushed” these edges against the lid. The wire insulation was damaged, although the wire strands remained intact. What happened in the end?

The chainsaw actually worked properly. She will work. Even if the cores of the wires break completely, the tool (ignition) will work, however, the chainsaw will not turn off. But if the wires damaged in the insulation (the ends going to the module) are closed together (or a single wire about the “mass”), then the ignition will disappear and the tool will not work, it will not start.

Need for ignition adjustment

If it turns out that the fault is still in the module, then it is necessary to check the gap between the coil (core) and the flywheel (magnets). In the event that the gap does not meet the necessary parameters, then it is knocked down.

It should be understood that ignition alone, on imported direct-powered chainsaws, cannot go astray by itself. If this happened, then your tool is counterfeit, or you ran into a marriage!

The problem lies in the screw clamps, with which the ignition module is fixed. To be more precise. in their absence. What it is?

The ignition module is secured with screws. A chainsaw vibrates during operation, and vibration affects all parts of the structure, all components. The gap between the magneto must be constant and appropriate. The screws (seat) of the fastening of the ignition module must be “sealed” with a special clamp. a viscous substance of various consistencies. In the case of ignition of a chainsaw, the lock should be of a strong consistency. The latch, in fact, is a gasket, a seal, which eliminates the weakening of the fasteners. screws.

To troubleshoot, you must:

1. to turn out screws of fastening of the module;
2. to fix the fixing holes of the screws with the clamp;
3. screw the screws back;
4. set the gap;
5. tighten the screws that secure the module.

Another case when it is necessary to set the ignition is to replace the faulty module with a new one. How the ignition is set, we will consider in the next chapter.

How to set the ignition

I myself have never replaced the ignition module or set the clearance. Although there was a malfunction in the module. at work it was covered at me more than once. The fault was fixed in the service.

However, as you know, there are a lot of videos and article notes on the network on how to replace and set the ignition on gearless chainsaws. Well, we will use these recommendations.

In our case, when a malfunction is detected in the cutting area, replacing the magneto and adjusting the ignition is relevant only when there is a working module in stock and a screw lock. With a high degree of probability, I can suspect that such an option is excluded, although among prudent "covens", "it may even be very possible."

If the repair “suffers”, the ignition was purchased after the “trouble” and not on the watch, then it is advisable to entrust the repair to a specialist in the service center. If you have the time and need for savings, then we make repairs on our own.

First of all, remove (disconnect the connectors) from the wire module. high-voltage cable, start wires. We unscrew the fastening screws (usually two of them) and remove the defective coil.

In its place, we install a new serviceable ignition module. We connect all the wires, use a screw clamp in the threaded mounting holes, bait fastening screws.

Now we need to set the necessary clearance. Turn the handwheel with magnets to the core fragments of the coil. Between the magnets and the ends of the core we install a probe 0.2-0.4 mm thick (check in the “manual” for your saw model). If the probe is missing, then it can be successfully replaced with a fragment from a plastic bottle from under the juice / beer. To do this, cut a rectangular strip, install between the coil and the flywheel, tighten the mounting screws of the module.

The gap is established, it is necessary to eliminate the strip of plastic bottle, which served as a probe. To do this, hold the edge of the strip with pliers and scroll the flywheel. The strip will be removed as the flywheel rotates.

What else do I want to say about the ignition. From my own observations from personal experience, I can say that ignition modules more often they “fly” to Khuskvarnykh (3 cases for all my work experience). On Calm, my ignition never “flew”, although I admit that I worked as a professional Calm for only 1.5 years. There is a “bytovuha” in the household (knot). Stihl 180, I have been operating it for 12 years, but such a misfortune did not happen. Worked at an early stage as a "Partner", but also no breakdowns with ignition did not occur. He didn’t work with other saws, he only “tasted” for a short time at sawing firewood.

Perhaps I’m wrong, so refute my speculation and allegations. I will be glad to discuss.