How to check chainsaw crankcase tightness

Pump to check chainsaw crankcase for leaks

Chainsaw related breakdowns can be numerous, and solving some can be quite difficult. If you’ve been working with this power tool for a long time, have you ever had a problem where the gasoline doesn’t come into the carburetor or comes in, but it’s very difficult and doesn’t let the chain saw start normally. Fortunately, experts have long found the causes of such a failure, and so we have compiled the main ways to repair.

The first thing to do is to check for trivial reasons, such as the presence of gasoline in the tank. If there is one, check the fuel flow process from the tank on the wire. Just disconnect the gas line from the carburetor and try to pump fuel. The correct way would be to feed fuel through the hose with jerks, this will make sure that there are no problems with the gas tank. If the fuel does not flow even jerkily or drips too slowly, the reasons may be as follows:

The fuel filter is clogged with dirt and dust;

Surprisingly, even having a full tank can be the cause when no fuel comes in. Try not to overfill the tank. An overfilled fuel tank can pressurize the tube that connects to the carburetor.

Poor quality gasoline

Every experienced chainsaw user knows that fuel should not be left in the tank of the tool for long. The fact is that during prolonged storage inside the tank will occur unnecessary processes with the formation of resin and polymerization of various components. Do not leave fuel in the tank for more than 2 weeks and even if your power tool starts with that fuel, it can cause fouling of the cylinder block (rings, piston).

Air filter

If your chainsaw has no gasoline in the carburetor, pay attention to the type of air filter. If it doesn’t work properly, the chainsaw becomes unstable and then has trouble starting or stops when it’s running. The air is harder to flow into the machine and makes the mixture too rich. You won’t be able to start it, and dust is the cause.

Remove the air filter carefully, because if dust is stored on it, it can crumble onto the carburetor. It is sufficient to clean the air filter with water and detergent. Be sure to dry the filter before installing it.

Chainsaw Crankshaft Seal Replacement

Repair of a chainsaw with their own hands: analysis of the main breakdowns and ways to fix them

It would seem, for what benzopila dacha owner who grows vegetables and fruits, or the owner of a suburban home, which has a small garden and a few flower beds? The question falls away when there is a desire to build a bath house, renovate the greenhouse, to fell an old business or just to make a bench for recreation. Unfortunately, no matter what mechanism occasionally needs prevention and replacement of parts, and it requires an excellent understanding of the device of the product, in addition, the repair of chainsaws with their own hands will save time and money.

The design of the chainsaw and the general classification of malfunctions

The main condition for successful repair is the correct diagnosis. Therefore, in order to determine why the chainsaw failed and, most importantly, how to make it work again, first of all it is necessary to know the features of its construction.

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It should be noted, it is not particularly difficult, as it includes:


  • Engine (two-stroke gasoline engine);
  • the functional part (saw bar and chain);
  • Systems that ensure the joint operation of the two units (ignition, filtration, lubrication, etc.д.), that is, the tool as a whole.

In order to simplify the diagnosis of malfunctions, it is customary to distinguish them into two main categories:

The most frequent faults occur in the engine systems, but the other parts of the tool, due to intensive use or improper maintenance, can fail at any time. How to determine where exactly the failure occurred? Here is some simple logic.

If the problem is in the engine, it will:

How to Pressure Test a Chainsaw by Matthew Olson

As for all other faults, as a rule, they manifest themselves with a normally running motor.

Checking the ignition system

The first thing to do if the chainsaw is broken. look around the spark plug by disconnecting the wire and carefully twist it with a special key.

Parts of the chainsaw ignition system: 1. handwheel with magnets, 2. ignition module, 3. spark plug, 4. high voltage wire

check, chainsaw, crankcase

Unscrew the spark plug to check its condition

  • Dry. The fuel mixture is most likely not getting into the cylinder. It’s not the ignition system, so the spark plug is screwed back on.
  • Very spattered with fuel. The reason for excessive fuel consistency is either improper starting or improper carburetor adjustment. The spark plug is wiped thoroughly, the fuel feed is cut off and the starter is turned on to remove the excess fuel and air out the combustion chamber. Then put the spark plug back in place and restart the mechanism.
  • Covered with black sludge. That could be a sign of bad oil, an improperly adjusted carburetor or a faulty petrol to oil ratio. Clean the spark plug, remove the carbon deposits with a sharp object (an awl or needle), sand down the electrodes and replace.

READ Adjusting the carburetor on a Poulan chain saw

Checking the spark plug, you need to pay attention to the gap between the electrodes: the normal value is from 0,5 to 0,65 mm. A damaged or worn gasket should be replaced.

A huge amount of dark soot on the spark plugs indicates a malfunction of the engine

To be absolutely sure you should also check the spark plug. To do this, the ignition cable is put on the spark plug, connect the spark plug nut and the cylinder with pliers, turn on the starter and look for a spark. If there is no spark, the spark plug needs to be replaced. If the new plug also does not give the spark. the problem in the high-voltage wire or a violation of the connection with the plug.

Evaluation of the cylinder-piston group condition

Often the engine does not start or does not work at full power due to low pressure in the cylinder. It may be caused by wear of a piston or cylinder, sunk piston rings, worn bearings. To partially discern the condition of the cylinder-piston group (CPG) is possible by removing the muffler and looking through the opening.

Compressometer, placed in the plug hole, will help to make a stasis of compression in the engine. the results of the measurement can also glasnost about the state of the cylinder head. Clear data is obtained only after a complete disassembly of the mechanism. If there are any chips or scratches on the piston, it must be replaced. The piston ring must be unstained, free of fouling, and in its proper place.

Piston and crank mechanism wear and tear is considered a severe problem

If pistons have chips and scratches, they must be replaced

How to Check Oil Seals on a Chainsaw Crankshaft

It would seem that why would a chainsaw be necessary for an elderly resident who grows vegetables and fruits, or has a small garden and a few flower beds? The question disappears when the desire arises to build a bank, modernize an old business, or simply create a bench. Unfortunately, any mechanism needs to be repaired with your own hands, saving you time and money.

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Constructional elements of chainsaws

All this is due to its own structure, regardless of whether it is a European production (Echo, STIHL, Husqvarna) or domestic (Kedr, Ural). The main components are located inside the housing. Fuel tank and engine, on the outside. The starter, the handle, the dust part (the bar) and the chain. A sharp jerk of the cable starts the engine, and it’s the blade of the saw.

To begin, we suggest that you read the video clips that show how a chainsaw is built and how it works:

To eliminate which disassembly is required. What can happen to a simple machine like a chainsaw? At least the following:

Significant problems are related to engine operation (fuel system, exhaust system, ignition, cylinder and piston) or malfunctions of other systems and components (clutch, brake chains, tire, lubrication system). Let’s look at the most common breakdowns and methods of fixing them.

Clockwise saw starts with a single jerk and does not fail in the cut

Fuel system repairs

Fuel can’t get into the cylinder for the following reasons:

  • Fuel filter is dirty. You need to remove the fuel hose and check the fuel flow. If the jetting is weak, you may need to clean the filter. It has been replaced with a new fuel tank. We recommend changing the fuel filter every three months.
  • Clogged breather tube (hole in the fuel tank cap). Also check hose connections in case the needle is clogged.
  • Not enough or not enough fuel. There may be several reasons for this. The first reason. clogged air filter. This is because too much fuel mixture disturbs the engine. The clogged filter is carefully removed, cleaned and washed with water, then dried and replaced.

Other reason. Improperly regulated carbon emissions. Adjustment is done with three screws.

Timely replacement of the fuel filter ensures a full fuel supply

The fuel hose and the feed actuator must fit tightly on the valve.

check, chainsaw, crankcase

The throttle control lever cable should be in place

You must use the instructions when working, otherwise you can only make it worse.

And the last reason. it is a breach of membrane integrity or clogging of the carburetor ducts.

All parts should be clean, dry and undamaged.

Muffler disassembly and cleaning

If the engine is running normally at low rpm, it may cause the spark plug to be clogged with combustion products.

  • remove the muffler;
  • disassemble (there are inseparable models);
  • clean deposits with detergents;
  • dry out;
  • set it in place.

Dry cleaning is unacceptable because it contains dangerous carcinogens. After removing the muffler, cover the branch with a clean cloth.

Faulty chainsaws indicate a possible clogging of the muffler

The composition of the fuel mixture must be monitored to prevent the muffler from clogging. The amount of oil must not exceed the norm. Poor oil quality also has a negative impact on engine performance.

Chain Lubrication System Repair

  • Oil leakage. You need to check for cracks. Troubled tubes sealed or replaced.
  • Not enough oil flow. Lubrication ducts are most likely clogged.
  • Cracks in the oil pump housing. Part must be replaced.

Chainsaw material is also useful:

Here’s how to diagnose the lubrication system:

Adjusting the brake chain

Brake chains often fail due to clogged lubricant or sawdust on brake band and space under cover. All parts can be cleaned of debris. Can replace it.

Chain brake restored by mechanical cleaning.

Some chainsaw parts wear out faster than others. Anti-vibration elements. It’s always best to have spare parts on hand for quick replacements. Don’t neglect sharpening the chain.

How to check the crankshaft oil seals on a chainsaw

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In this video we’ll look at how to quickly replace the chainsaw or brushcutter crankshaft oil seals.

Buy parts for chain saws and brush cutters

Malfunction of an undefined category

In some cases, chainsaw owners have to solve more complicated problems to fully restore the functionality of their cutting tool.

The chainsaw does not develop full power

In addition to the problem discussed above with a lack of gasoline or air flow into the cylinder, the cause of weak power may be a clogged muffler.

If you don’t periodically clean a clogged combustion muffler, the problem of poor engine performance may not be the only.

Leaking carburetor and clogged injector

Over time, the screws that secure the carburetor cap can become loose or the gaskets can fail. A clogged filter or improperly replaced filter can result in clogged jets. All of these factors also impair chain saw performance and shorten the life of the saw.

To prevent this, it is sufficient to periodically inspect the saw and, if necessary, tighten the screws evenly.

The chainsaw won’t hold idle speed

It’s not uncommon for a chainsaw to refuse to idle smoothly after extended periods of transportation and constant use. This problem is usually fixed by adjusting the carburetor.

You can learn how to correct carburetor adjustment in this article

If the carburetor is tuned like clockwork, you need to check:

  • Fuel system. It is more logical to begin with the fuel pump.
  • Muffler. There is a high probability that the engine will not run well because of excessive soot buildup.

Your chain saw is losing power under load

If the saw’s power has gone somewhere in the process, you should look for the problem in the following places:


The overall arrangement is traditional in style. The machine is distinguished by its simplicity and hence its reliability.

The schematic diagram of the general construction of the Partner 350 chain saw.

Engine start-up is characterised by simplicity and reliability. This is made possible by electronic ignition. Large role in start-up is played by the primer (fuel priming pump).

The air filter is equipped with a dual air-filter system. By equipping the starter drum with a vane, coarse debris does not reach the filter at all. Its service life is thereby extended and the degree of air purification is increased. Benefits for the engine on the whole.

Safe handling of the chain saw is ensured by a chain brake that operates in two modes: manual and automatic.

The oil pump is only switched on during sawing. This means that the chain lubrication system is working automatically. It is necessary to take into account that different kinds of oils are used for the chain lubrication and the working mixture. If you want to know what kind of oil to use with your Partner 350 chain saw, watch the following video

Saw chains. The Partner 350 features the Oregon 91P052E 3/8″ 1.3mm 52 link chain. Substitutes are allowed for the following products: STIHL 39970000052c and others. For example, Husqvarna 5776151-22. With a chain pitch of 3/8″ and a groove width of 1.3 mm, make sure the number of links is 52 or less. Less (46 to 50) is fine, more is not desirable.

The anti-vibration system on the Partner 350 is a little stiff. Considering that this saw is not intended for professional use, the system as a whole can be considered satisfactory. By the way, subsequent models have undergone significant improvements in this regard.

Recommended parts, components, mechanisms, lubricants and fuel-and-lubricants are not compatible.

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