How To Repair Stihl Chainsaw? Do It Yourself!

With all the diversity of modern building materials, wood remains very relevant. Therefore, loggers, improvement workers, summer residents are interested in tools for woodworking, including chainsaws.
Chainsaw Stihl is easy to operate, inexpensive in price, reliable, has a long service life.
Different people prefer different brands. Someone is interested in a chainsaw Partner, someone. a device brand Stihl, someone. something else. But they all break down at times, and their failures are similar to one another, and different. Next, consider the repair chainsaw Stihl do it yourself.
This brand is well-known both among professionals and private individuals involved in arranging their own living space. The high popularity of the Stihl chainsaw causes frequent practical use of this tool and makes it necessary to look for ways to effectively combat its typical breakdowns.

Basic types and troubleshooting, tools for troubleshooting:

Before you begin disassembling a faulty mechanism, you must prepare the appropriate tools. Since the chainsaw is a technically relatively simple device.

This list is small and includes:

  • set of screwdrivers;
  • spanners;
  • set of socket keys;
  • the needle.

In order to conduct a full-fledged high-quality restoration of the working condition of the Stihl chainsaw with your own hands, it is necessary to establish the exact cause of the breakdown. Since this chainsaw refers to the mechanisms set in motion by the internal combustion engine, the main malfunctions are associated with this unit.

The most common Stihl chainsaws in service are the following faults:

  • no engine start;
  • unstable operation of the internal combustion engine immediately after the start-up, as a result of which after a short operation the power unit spontaneously turns off;
  • running engine does not reach full capacity;
  • oil is leaking.

One of the frequent breakdowns of the sawing device is also an open circuit. But it does not apply to problems arising from the operation of the motor system. Usually repairing a broken chain comes down to replacing it with a new one.
Troubleshooting, which led to the failure of the chainsaw, is performed in the following order. First of all, check the level of gasoline in the tank. If the level is OK, proceed to inspect the trigger. If the trigger does not show signs of breakage, it is necessary to pay attention to the spark plug.
If, as a result of a thorough inspection and checking the correctness of the gap, it is established that the candle is completely intact, then the carburetor may be the cause of the malfunctions that force you to repair the chainsaw. This often happens due to the fact that this device is clogged corny.
However, if the old candle is replaced with a new one, the carburetor is completely cleaned, and the chainsaw still does not start up or, having earned, quickly deafens, then a faulty cylinder-piston group (CPG) may be to blame. In order to qualitatively check the entire group, you will have to spend some time, almost completely disassembling the specified system. In this case, the technical condition of the cylinder, piston and piston rings is checked.
And now we will consider each malfunction in a little more detail.

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Malfunctioning fuel supply system.

As mentioned earlier, the inspection of a failed sawing tool must begin with the determination of the presence of gasoline in the fuel tank, as well as with the determination of the technical condition of the breather.
Repair chainsaws Stihl in case of malfunction of the fuel supply system.
When checking the fuel level, it is imperative to open the fuel tank cap. This should be done even if the owner of the tool has the confidence that there is gasoline in the tank.
Often the saw can not start due to the lack of fuel in the combustion chamber. The reason for this is most often the ordinary clogging of the breather. a special bypass valve, which serves to equalize the pressure in the tank with the gradual consumption of gasoline. In this case, the repair of the chainsaw comes down to a careful cleaning of the breather with an ordinary sewing needle.

Trigger Troubleshooting.

The cause of the failure of the entire instrument may be an inoperative trigger or problems in the ignition system. If it turns out that the starter is operating normally, then it is necessary to verify the condition of the spark plug. In order to do this, the candle is turned out of the socket and carefully inspected, paying attention to the presence of foreign deposits on its electrodes.
It is worth noting that the presence of traces of a certain property in the place where a spark was formed speaks very eloquently about the sources of the “disease” of the entire starting system. Such source, in particular, can be a carburetor. Thus, the complete absence of any signs of fuel on the candle (its complete dryness) most likely indicates that the fuel does not pass into the combustion chamber due to the carburetor is completely blocked.
If the gasoline on the chainsaw candle is fixed, and the cutting device itself does not work normally, then this indicates an excess of air-fuel mixture. The reason for this condition may be a failure in the carburetor adjustments, clogging of its nozzles, as well as improper starting of the mechanism. In the case of fixation on the candle of a characteristic deposit, it is possible to speak with sufficient confidence about the improper functioning of the carburetor or the use of low-quality gasoline.
With all the above signs reflected on the spark plug, it is necessary to remove the carburetor and check its technical condition. If a blockage is detected, the carburetor should be thoroughly cleaned, then the device must be adjusted according to the technological requirements and the gasoline used in the tank must be replaced. It should always be remembered that the carburetor is a rather complex assembly consisting of many small components, parts, and tubules. Therefore, its repair should be carried out with extreme caution and care.
In addition to restoring the carburetor, you need to check on the stand and the performance of the spark plug itself and, if necessary, set the correct gap in it. If the candle and its work do not like at all, it is recommended to replace it with a new candle.

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Malfunctions of the piston group of chainsaws.

Sometimes the tool engine does not start up or works with obvious interruptions and without reaching the rated and maximum power due to a malfunction of the piston / cylinder group. In this case, the repair of the chainsaw is done in the following order.
On the cylinder head 4 bolts are turned off, after which the cylinder is removed from the block. The piston is carefully checked for the presence of chips, scratches, scuffing. Their presence is unacceptable and entails replacing the piston. However, there should not be the slightest mechanical damage on the cylinder itself. It can either be repaired by boring a mirror for a piston repair size, or it can be replaced with a new one with a piston.
Of great importance for ensuring optimal pressure in the combustion chamber is the absence of signs of wear of the piston body and piston rings. From this largely depends on the normal operation of the engine chainsaws.
Determine the degree of deterioration of parts can only be after removing the piston group from the motor. The rings themselves should be tight enough and free to sit on the piston. In the presence or absence of wear of the piston and rings can be verified experimentally. To do this, follow the piston inserted into the cylinder, slightly swing it in different directions. Too free piston stroke, most likely, testifies to its wear.
To eliminate this defect, they either drill the cylinder and install repair parts, or change the entire set of CPG. Otherwise, the chainsaw will not develop the required power.

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Malfunctions in the lubrication system and their removal.

Repair chainsaws required in case there are problems with the lubrication system. Most often they consist in the absence of oil supply to the chain, as evidenced by the apparent dryness of the latter, or in the leakage of oil.
Lubricating fluid is either bad or does not flow at all to the circuit, as a rule, due to clogging or complete blockage of the supply oil channels. To identify the places of overlap of the current of oil, it is necessary to carefully examine the oil hose and the points of its connections. In addition, be sure to clean the oil filter.
If the oil leaks, it indicates a violation of the tightness of the oil channels or hose. This is usually due to mechanical damage. Most often the unsuitable hose is removed, and a new one is put in its place. But sometimes they use a less radical method, treating a damaged hose with an appropriate sealant.
Thus, the repair of a Stihl chainsaw due to the relative simplicity of its design and the fundamental similarity of its power unit with many other internal combustion engines can be carried out on its own. And it can be done in normal home conditions, without resorting to the help of specialist repairmen.