Replacing crankshaft oil seals on a Chinese chainsaw

How to Check Chainsaw Crankshaft Seals Without Disassembly

Although the chainsaw is a simple device, from time to time problems arise in its operation, which can only be solved by disassembly. The following malfunctions are examples:

  • The chainsaw does not pick up speed;
  • The chainsaw stops functioning in the cut;
  • The chainsaw starts and stalls;
  • The chainsaw loses its power;
  • The chainsaw is not picking up speed when pressed.

Most malfunctions are due to engine failures, but also to malfunctions in other systems and components. Proper handling of this technique is important. If all the rules of use are followed, the problems are probably most obvious. Finding the causes of malfunctions is advisable to start with checking the simplest part of the chainsaw and end with the most complex.

Malfunction of the fuel system in the chainsaw

Every person who is familiar with gasoline tools knows that sometimes the technique works intermittently, and can at one point stall and no longer start. There are many reasons why the chain saw does not start, let us try to consider the most common of them. The first thing to do when the chainsaw malfunctions is to inspect the spark plug by disconnecting the wire and carefully unscrewing it with a special wrench. The components of the ignition system of the chainsaw:

The spark plug is unscrewed to check its condition Its appearance speaks volumes:

  • Dry. Fuel mixture is most likely not getting into the cylinder. It’s not the ignition system, so the spark plug is screwed back in.
  • Highly splashed with fuel. Excess fuel mixture is caused by either improper starting or improper carburetor adjustment. Wipe the spark plug thoroughly, cut off the fuel supply and turn on the starter. to remove excess fuel and air out the combustion chamber. Then put the spark plug back in its place and restart the machine.
  • The spark plug has a black sludge on it. This could indicate the use of low-quality oil, a poorly regulated carburetor or a miscalculated gasoline to oil ratio. The spark plug should be washed, cleaned of carbon deposits with a sharp object (an awl or a needle), the electrodes wiped with a sandpaper and put back in place.

Checking the spark plug, pay attention to the gap between the electrodes: the normal value is between 0.5 and 0.65 mm. A damaged or worn gasket must be replaced.

A large amount of black soot on the spark plug indicates engine malfunction. To be absolutely sure, check also the spark plug. To do this, put the ignition cable on the plug, connect the nut and the cylinder with pliers, start the starter and watch for sparks. If there is no spark, the spark plug must be replaced. If the new spark plug also does not produce a spark. the problem is in the high-voltage wire or in a violation of the connection with the spark plug.

Fuel may not enter the cylinder for the following reasons:

  • Fuel filter clogging. You should remove the fuel hose and check how the fuel is flowing. If the jetting is poor, the filter may need to be cleaned. It is taken out through the filler hole of the fuel tank and cleaned, in case of heavy contamination it is replaced with a new one. It is recommended to replace the fuel filter every three months as a preventive measure.
  • The breather plug (hole in the fuel tank lid) is clogged. Check also by disconnecting the hose and if it is blocked, clean it with a needle.
  • Missing or insufficient quantity of fuel. There can be several reasons for the malfunction. The first reason is the air filter is clogged. Air is not getting to the carburettor in the proper amount and engine operation is disturbed because the fuel mixture is too rich. The dirty filter is carefully removed, cleaned and washed in water, then dried and installed in place.
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Another reason is that the carburetor is not properly adjusted. Adjust with three screws.

Timely replacement of the fuel filter ensures a full fuel supply.Fuel hose and air damper actuator must fit tightly on fittings. The throttle lever cable must be in place. During work, it is necessary to use the manual, otherwise you can only make things worse.

And the last reason. the failure of the integrity of the membrane or clogging of the carburetor channels. To repair the carburetor yourself, it is necessary to become familiar with all its parts. All parts must be clean, dry and in good condition.

  • Oil leaking. Check if the pipes are firmly connected to the pump joints and there are no cracks. Troubley tubes can be sealed or replaced.
  • Insufficient oil supply. Lube lines are more likely to be clogged.
  • Cracked oil pump housing. The spark plug needs to be replaced.

The chain brake often does not work because the brake band and the space under the cover is clogged with grease or sawdust. All parts should be cleaned of blockages. It is possible that the belt is simply worn out, then it must be replaced.The function of the chain brake can be restored by mechanical cleaning. Some chain saw parts wear out quicker than others.

Faults in the ignition system are the most common cause of failure of the power tool’s engine. This is where you should start troubleshooting.

Inspect the spark plug. To do this, carefully remove the high-voltage wire from the head, then unscrew the spark plug from its housing with a special wrench.

If the spark plug is wet, it is too much fuel. Over-fueling is most often caused by improper carburetor adjustment or ignition system problems.

The candle should be thoroughly wiped with a dry paper towel and dried. It is also necessary to drain the cylinder, close the fuel supply and run the starter several times to remove excess fuel mixture.

After these actions it is necessary to put the spark plug back in place, open the fuel supply and try again.

If the spark plug noticeable a lot of black carbon deposits, it usually indicates a malfunction in the fuel supply. a violation of the ratio of gasoline / oil, poor-quality oil or the need to adjust the carburetor.

In this case you need to clean the spark plug with a needle or a sharp awl from the accumulated carbon deposits, clean the electrodes with an emerald skin until they get a metallic sheen and plug it back in. At the same time it is necessary to check the tightness of the spark plug gasket.

If a blue spark is flashed from a distance of 2-3 mm, everything is fine. If the spark appears only at a distance of 0.5. 1 mm, most likely there is a problem with the ignition system. If there is no spark, you need to check the high voltage cable with a probe. There may have been a wire break in it.

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Chains for chain saws. How to choose? How it works? Video.

If all the actions performed were not successful, try to change the spark plug to a known faulty one and try to run the chainsaw again.

Chainsaw bearings

Many rural residents, as well as dacha owners, farmers and owners of large homesteads have a Russian or imported chain saw in their arsenal. This is a simple, rugged tool with a single-cylinder, two-stroke carburetor engine that can be used for anything from building work to chopping firewood and taking care of trees and shrubs. The design of chainsaws is purposefully made extremely simplified, so that users could independently carry out maintenance and repair work, being away from big cities and official service centers. In addition to many other important operations, such as replacing and adjusting spark plugs, cleaning the fuel filter and muffler, chainsaw maintenance and repair includes lubricating or replacing bearings. Since these play a major role in the chain saw’s function, this aspect of servicing has to be given close attention.

The fuel filter is dirty

If the air filter is not working for you, then try changing the fuel filter. it is in the tank and attached to the hose that takes fuel from the tank.

You have to gently pry the hose out of the tank and remove the end where the filter is mounted. Here the option to work without a filter, as in the case of the air, is better not to apply, because you can not know exactly whether there are any unnecessary impurities in the fuel.

So just change the fuel filter for a new one and try it again. If it’s okay, congratulations. you have found the cause.

The chainsaw starts and stops. the reason

If the chainsaw starts and stops on the first try, it may be because the chain brake is giving out or the chain is jammed because of lack of oil. In this case, the oil level is measured. If the oil volume is sufficient, the cause may be a tube that leads to the lubricator mechanism.

Another cause could be carburetor failure. If it only needs adjustment, you can do it yourself according to the instructions. If the carburetor needs to be cleaned or repaired, you cannot do without the help of professionals.

Another possible cause of this fault is that the fuel level in the tank is too low. In this case, the chainsaw stalls when tilted because the rest of the fuel mixture is in the part of the tank that is opposite the suction tube.

replacing, crankshaft, seals, chainsaw

Removing the flywheel

The chainsaw flywheel Pin 180 is twisted with great force, so a metal ring head is required to remove it. The nut holding the flywheel is disconnected by 13.

To block the crankshaft from turning, you must unscrew the spark plug and install the piston plug through the spark plug hole, if it is not there, you can use an old lace from the starter, with the knots attached to it and dipped into the cylinder through the spark plug hole.

It is strictly forbidden to rotate the flywheel by installing a power screwdriver and other tools between the ribs and the body, with such a method of blocking from turning the flywheel blades are not able to withstand the load and break.

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Carburetor malfunction

If all of the above steps were not successful, your chainsaw may be suffering from a faulty carburetor.

In this case, it is checked and adjusted. However, if you have no experience doing such work, then you should find through friends or on the ad a specialist who knows how to do it. Otherwise you risk losing your saw. The carburetor is a device consisting of many parts of very small size, which, if unskilled disassembly can simply fall out and get lost.

How to remove the gas tank on a chainsaw

A chainsaw is a simple device that can last a long time with proper care. In this case, the saw is a tool, subject to different loads and, therefore, breakdowns still occur. To find out what caused a particular malfunction and how to fix it, you will learn from this article.

Repair it yourself or take it to a service center

It is worth realizing that not every problem can be repaired by yourself. Not every chainsaw owner has a compressometer at home, or a special tool that can create a vacuum and pressure to check the compressor crankcase for leaks, for example. In such a case, you simply cannot do without calling in a specialist.

Troubleshooting Algorithm

If you are sure you can reassemble the chainsaw after disassembly, get a screwdriver. To determine the true cause of the problem it is necessary to analyze the condition and the behavior of the saw.

No gasoline in chainsaw cylinder

There are several reasons why the fuel mixture has stopped flowing into the cylinder:

  • The air filter is clogged.
  • carburetor settings are off.
  • The carburetor diaphragm was no longer intact.
  • Channels that carry gasoline are clogged.

Комментарии и мнения владельцев and opinions of the owners 40

yesterday the crankshaft bearings jammed on startup for some reason. took it apart it is dirty and everything washed and oiled. Everything started spinning. Reassembled it. saw does not start spark and gas is flowing. there is only one BUT. assembled with clear silicone sealant. reassembled it and after an hour tried to start it. silent. and poured under the spark plug, zero too. maybe it will not start because of bad sealing? the saw was new and only worked 5 times.

Dirt in the bearing means dirt in the gasoline! I don’t know, try another sealant.But that’s probably not the reason!

in the first part of the photo you can see a bottle of oil 80% of it is faulty and that is why the bearings are scuffed

Capacitance color print quality. Well, the video’s just fried.

You’re the expert! 1) The label is not visible on the photo, but you see the print quality and you have identified a fake, or rather you saw it right away. 2) The color of the bottle can distort the camera as you want, depending on the white balance setting and the sensitivity of the camera. 3) I bought oil from an authorized STIHL dealership, not at the market!

They even repair chainsaws here))). And they say the site automotive. I, too STIHL, 290 meters, and disassembled then the oil hose changed

Good chainsaw. I have been working since 2008 and there are no problems. I saw about 12 cubic meters per year to heat the house.

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