Replacing Crankshaft Oil Seals for Chinese Chainsaw

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Chinese chainsaw shoots at a carburetor. Why doesn’t it start hot?

Before you begin to solve this problem, it should be noted that the productive and proper operation of the engine depends primarily on speed through the application of the starter mechanism. In most models, this “minimum” level is 800 rpm. Air stops flowing into the carburetor in the right amount, the Stihl chainsaw. Of no small importance is the fact that the main reason for the "not working" chainsaw is the usual engine flooding.

After this, it is worth noting that before starting the immediate implementation of actions regarding the “prescribed recommendations”, try to start the device directly in the idle position. To do this, just pull the “rope”. Since in that case, if not a hot engine, the plant will be produced without any problems.

But if you do not succeed, it means that it is already quite cooled. In this case, fix the half-gas according to the instructions in the instructions that came with your chainsaw.

But if this does not help, in this case, you should directly rotate the cold-running screw, directly clockwise.

Remember that the higher the RPM level in your device, the easier it will be for you to start the device. Why does a chainsaw shoot if a chainsaw does not start or shoots at a carburetor. And remember that the chain must be stationary relative to the cold running.

Replacing the crankshaft oil seals of the Chinese chainsaw. Replacing oil seals on a chainsaw: Stihl, Ural and others

Today, many users can not do without a quality chainsaw, because in everyday tasks it helps to cope with a variety of wood, branches and logging. Thus, the tool should always be in good condition, for which timely diagnose and repair the desired item.

Depending on the model used, parts and small oil seals can be of different quality. Replacing the seals on the crankshaft and other elements is a responsible matter, although it takes a minimum of time. Oil seals are made of high-strength rubber, but they leak over time, and timely replacement is required. When the oil seal crackes or gets a defect, oil starts to leak, which leads to a breakdown of the entire engine. Therefore, when determining the problem, quickly replace with a similar part.

Each chainsaw, regardless of brand and price, has the same design, so more often the oil seal flows in the crankshaft area. Oil seals are also located in all rotating saw mechanisms; check them if possible. If you are minimally versed in the design of a chainsaw, then it will be easy to get to the gland. Just remove all elements that interfere with access to the crankshaft oil seal.

Please note: there are 2 oil seals on the crankshaft, one at the beginning of the crankshaft, the other at the end. The part reliably seals the inside of the engine, closing the bearing. Without this oil seal, oil will whip in all directions, so you can determine the breakdown by oil leakage from the crankshaft.

How to remove the Stihl chainsaw crankshaft oil seal?

Regardless of the brand of the chainsaw or its design, the seals are removed using a similar technology. When you get to the broken part, carefully remove the stuffing box. This is done in several ways:

  • Using a special puller, but make sure that the oil does not come out of the crankcase;
  • A cheaper and easier way is to pick out the gland from the groove with a sharp object;
  • If the part sits tight and its size is sufficient, you can go the old proven way. screw a screw into the gland and pull it out with pliers.

It is not necessary to protect the old stuffing box during dismantling, but the main thing is not to damage other parts of the chainsaw. If we are talking about branded, then the work is best done in specialized services. It is also better to buy an oil seal than the original one, practice shows that cheap analogues quickly begin to leak.

A new oil seal is put on quite simply, it must be pressed into the landing hole with a puller or other object. The main thing is that he entered smoothly and did not stick out. Also, everything needs to be done carefully, since the rubber part is easily damaged. The sizes of the chainsaw seals can be indicated in the old sample, or they can be easily selected according to the model of your chainsaw. As you can see, the replacement does not cause any difficulty, similarly carried out with other oil seals.

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Repair gas handle chainsaw. Dismantling and assembling a chainsaw yourself

The low level of technical equipment of many service departments and the high cost of their services force many owners of faulty chainsaw equipment to repair their gadgets themselves. How to disassemble a chainsaw, replace defective parts, and also correctly assemble a chainsaw with minimal time and money?

Self-disassembling a chainsaw involves the availability of spare parts, the appropriate tool and locksmith skills. It is possible that the dismantling of individual parts will require special pullers, the manufacture of which will take more time than the repair itself.

In a number of modern models of household and semi-professional chainsaws, special keys that are not included in the supplied kit are used to dismantle the drive chain sprocket.

Self Repair Issues

The problem in many cases is complicated by the lack of complete information on repair technology. According to foreign manufacturers, after the resource has been depleted, the saw should be written off as a waste, therefore the maintainability of many budget-level models raises reasonable doubts.

It is more difficult to restore professional-grade chainsaws.

  • The problem is complicated by the high cost of spare parts.
  • It is possible that to restore the operability of individual components and mechanisms, in particular, special equipment will be required to set up fuel equipment.

Replacing expensive branded parts with affordable, but short-lived Chinese counterparts does not justify itself economically. Practice shows that these components produce a resource at best by 50-60%.

Fault Detection Algorithm

The cause of the failure of the saw or the deterioration of its performance may be:

  • clogged fuel tank cap breather;
  • air intake by carburetor due to destruction of the gasket or loosening of threaded fasteners;
  • mechanical jamming of removable saw equipment and other minor defects.

Before starting disassembly, make sure that more extensive repairs are needed.

It is most likely that it will not be possible to independently assemble a new chainsaw after repair with the original quality. In the design of modern chainsaws, press fitings of mating parts, which have minimal maintainability, are often used.

Even partial analysis of the chainsaw with a tool at hand can lead to undesirable consequences. In most cases, to eliminate the malfunction, you can limit yourself to dismantling a single unit or system.

This list includes:

  • connecting rod and piston group;
  • carburetor;
  • clutch mechanism;
  • chain sprocket.
Replacing crankshaft oil seals for Chinese chainsaw

Tips for dismantling different components and systems

In the scope of this article, only general recommendations can be given, since chainsaws from different manufacturers can have significant technical differences.

Before disassembling the faulty tool, it is necessary to dismantle the saw set, drain the fuel and oil from the filling tanks, and clean the hard-to-reach places of the chainsaw from surface contamination.

Fuel system

Disassembling the carburetor requires special attention. This unit consists of many small parts, so the removed parts in a given sequence are stacked on a blank sheet of paper. After flushing all components, the carburetor is assembled in the reverse order.

Video: Replacing Crankshaft Oil Seals for Chinese Chainsaw


Compression recovery

Less complicated piston repair. To dismantle the cylinder, it is enough to remove the threaded fasteners, lay the saw on its side to prevent the pieces of the destroyed compression ring, piston skirt or other foreign objects from getting into the engine crankcase.

The cylinder mirror wears out unevenly, so installing a new piston does not give a significant effect. As a rule, during overhaul, after checking the suitability of the crankshaft, a complete set consisting of a cylinder, a compression ring piston and a piston pin is installed.

Launcher Repair

Disassembling the starter to replace the cord for an experienced user does not create problems, but the plastic case in most cases can not be repaired. Most of them are copies of the most popular European models, so we disassemble the Chinese chainsaw according to the standard scheme.

Worn parts of the saw set are not restored.

  • At home, you can shorten the new chain for installation on a shorter bus.
  • The resource of branded component tires is equal to the resources of three saw chains.
  • This indicator can be significantly reduced by incorrect choice of chain pitch or by large wear of the crown of the drive sprocket.

Finishing work

In a number of models, engine controls, start locks and an emergency stop system are displayed on the handles, to the place where the operator’s hand is grabbed. It is recommended to assemble the chainsaw handle after preliminary cleaning of the contacts of all electrical and mechanical communications.

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Self-assembly of a chainsaw is part of the repair work that requires special attention. The success of the final result is facilitated by the correct sequence of operations, a sufficiently high quality of parts, gaskets and other consumables.

Chainsaw carburetter adjustments and Chinese tool arrangement

The carburetor in internal combustion engines is responsible for preparing the fuel mixture. It consists of gasoline, air, and oil. When all of these ingredients have been used in the wrong proportions, the engine will not be able to operate normally. To prevent this, it is necessary to adjust the carburetor of the chainsaw.

Carburetor principle

Regardless of the manufacturer of the chainsaw, the procedure and principles of operation of the carburetor remain unchanged. This device consists of several main elements:

  • Tapering air pipe.
  • Fuel supply system.
  • Adjustable air damper.

After atmospheric pressure, the air after passing the preliminary treatment enters the narrow part of the tube, where its flow rate is regulated by means of a damper. Also here, the air becomes discharged and the resulting vacuum draws a combustible liquid from the fuel line. To adjust the fuel consumption, a special needle is used, connected to the nozzle chamber. The quality of the fuel mixture is regulated using the damper. when you open the air, more fuel starts to flow into the carburetor and the power of the power plant increases.

To avoid problems with the tool, it is necessary to periodically adjust the chainsaw. When too much air enters the mixture, it becomes lean and engine power decreases. Lack of air also negatively affects the operation of the unit, as fuel consumption increases. However, it does not burn out completely, which leads to the appearance of carbon deposits on the cylinder walls. It is quite obvious that the question of how to adjust the carburetor on a chainsaw is asked by many owners of this tool.

However, first, it is worth noting the signs of the quality work of the power plant:

  • Turnovers quickly gain.
  • The sound when the engine is running is similar to a four-stroke.
  • At idle, no chain scrolling is observed.

Situations in which setting is required

A new tool has been prepared for use. In this regard, for some time, the question of how to set up a carburetor on a chainsaw will not arise. However, experienced owners of the unit often carry out fine-tuning. For this, there is absolutely no need to disassemble the carburetor, as its design provides three adjusting screws:

  • L. used at low revs.
  • N. allows you to configure the maximum flow of flammable liquid.
  • T. is necessary for adjustment at idle.

All fine-tuning actions are carried out by ear, and at this time it is necessary to adhere to safety rules. Before starting all manipulations, markings should be made on the adjusting screws so that, if necessary, it is easier to return to the default setting.

The most common problem is the setting that is performed after a malfunction of the unit. Among the main reasons for their appearance should be noted:

  • Imbalance of screws and violation of the location of the protective cap.
  • Deterioration of the piston system, which requires changes in the composition of the fuel mixture.
  • Problems with the carburetor itself.

Adjustment algorithm

All work on setting up the carburetor chainsaw is carried out in four stages:

    The engine is being adjusted to run smoothly at low revs.

  • The carburetor is configured to create and supply a high-quality fuel mixture.
  • Fine adjustment is carried out at idle and only after the power plant warms up.
  • The quality of the tool in all modes is checked.

And now, as detailed as possible on how to adjust the chainsaw. If the tool does not start, it is necessary to set the adjusting screws H and L in their original position. Then you have to start the engine and let it warm up. After that, you can begin to adjust at low speeds. To achieve the optimum operating mode, screws L and T are to be used.

First of all, using the screw L, start the engine at maximum speed, and then release it by ¼. Screw T will allow you to configure the power plant idling. Traction and maximum revolutions are adjusted using the screw N, which must be slowly tightened, while monitoring the readings of the electronic tachometer. It is important to remember that the maximum number of revolutions declared by the tool manufacturer cannot be exceeded.

After adjustment, allow the engine to cool. Then it remains to start it in accordance with the algorithm for starting a cold unit. If at this time there were no problems, and at idle the chainsaw works well, you should check it under load. If there is a lack of power of the power plant, the adjustment is made using screw N.

Almost all Chinese chainsaws are equipped with carburetors, the device of which is similar to European models. Therefore, the differences in the setting will be insignificant. during the initial setting, the H and L screws must be unscrewed two turns. All subsequent actions remain unchanged.

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DIY chainsaw and do-it-yourself tool repair

A chainsaw today is a valuable helper in the household. For many owners of country houses, this unit has become indispensable. Despite the rather simple design, the tool sometimes fails. However, almost any person with a certain amount of knowledge in the field of technology and having a set of necessary tools can independently repair a chainsaw.

Chainsaw device

The simple design of the tool allows you to repair the chainsaw with your own hands. The main elements of the unit are as follows:

  • Power point.
  • Clutch.
  • Oil pump.
  • Chain drive.
  • The chain catcher and the braking system.

Depending on the brand, some changes may be made to the design of a tool. For example, the engine may be located horizontally or vertically. In professional saws, the second option is most often used. Due to the horizontal arrangement of the power plant, the dimensions of the tool are significantly reduced, which is important for home use. Knowing the unit’s device, you can quickly understand how to disassemble a chainsaw.

Most common tool malfunctions

No matter how competently the unit is operated, periodically there are malfunctions in the operation of its systems. To fix them, you need to determine the reason. Knowing the device of the chainsaw, it can be argued that most often problems arise with the operation of the engine. However, do not forget about other components that are also subject to wear.

Powertrain issues

It can take quite a while to identify the cause of a malfunction in the engine. Among the main signs of failure, several main ones should be noted:

  • The engine does not start.
  • The power plant starts to work, but quickly stalls.
  • At idle, maximum power is not reached.
  • Interruptions in work are observed.

When diagnosing a malfunction, the exception method must be used. It is better to start checking with those reasons that require a minimum of time to eliminate. Most often, the malfunction of the power plant is associated with the ignition system. It is the condition of the candle that can say a lot about the operation of the entire engine. First, using a special key, you must remove this element and then check its external state. The performance of the ignition system can be easily determined by sparking. When a strong and stable spark appears, you should proceed to the inspection of the fuel supply system.

The following problems are possible in her work:

  • Clogging of the cap breather prevents the fuel supply.
  • The fuel filter is dirty.
  • An insufficient amount of fuel flows from the carburetor into the cylinder.

To fix the problem, disassemble the system and clean it thoroughly. Fuel supply problems can be caused by contamination of the corresponding filter, which interferes with the process of creating a high-quality fuel mixture. If the chainsaw stalls under load, you should inspect the muffler, in which a large amount of combustion products could accumulate. The most difficult problem is the malfunction of the cylinder-piston group. This applies not only to the repair of Chinese chainsaws, but also to products of well-known brands. In this situation, it is practically impossible to do without the acquisition of spare parts.

Lubrication system and chain brake

When using the tool, particular attention should be paid to monitoring the operation of the chain lubrication system. Most often, problems arise due to clogging of the channels through which the lubricant is supplied. With a slight oil leak, you can continue working with a chainsaw. Otherwise, urgent measures must be taken to rectify the malfunction.

The first step is to check the tightness of the connection of the fittings to the tubes. It is possible that the replacement of these parts will be required, but everything can do with a simple replacement of the sealant. Do not forget about the oil pump, which must be checked visually. It must be replaced if there are cracks in the case. Problems with the operation of the brake most often occur due to contamination of the brake band.

Recommendations for use

To increase the life of the tool, you must follow some rules. This primarily concerns the saw chain and guide rails. It is recommended to replace the chain every three hours, and turn the guides 180 degrees. As a result, these elements will wear out evenly, which will extend the life of the entire tool.

During operation, it is important to constantly monitor the cleanliness of the chainsaw. When sawing wood, the unit quickly becomes clogged with sawdust, which must be removed in a timely manner. Contamination of process openings can cause problems with the fuel system. It is also important to timely change the oil and other consumables.