Piston installation on saw partner

Diagnostics of the chainsaw Partner 350

The correct definition of a malfunction is already more than half of the repair. In case of malfunctions associated with the fact that the saw does not start, the essence of the diagnosis is to check the spark and the presence of fuel in the cylinder, since there is either nothing to burn or nothing to ignite in the chainsaw.

spark test

To check the spark, it is necessary to unscrew the candle, install it in the cap of the high-voltage wire and attach it to the cylinder (there must be a mass on the candle). Next, pull the starter several times, while carefully looking at the candle. There will be no spark if the Partner 350 chainsaw has such malfunctions as:

defective candle (removed only by replacing it with a known good one);
broken wires in the system;
malfunction of the ignition control button;
defective ignition coil;
no gap between coil and flywheel;
broken key between crankshaft and flywheel.

Fuel check

The first sign that the cylinder is not getting fuel is a dry spark plug. Having found a dry candle, the next thing to do to more accurately determine the malfunction is to try running the Partner 350 chainsaw, pouring into the cylinder, through the candle hole, no more than 5 ml of gasoline. If the chainsaw does not start after that, then most likely there is no compression in it or it is not enough to start the engine. Causes:

CPG wear;
thermal scuffing of the cylinder or piston;
bullying due to the ingress of a foreign body into the CPG.

If, after gasoline was poured under the candle, the saw started up, then the problem is in the carburetor or the fuel line of the Partner 350. It is necessary to carry out a complete diagnosis of the fuel system.

Bearing diagnostics

When diagnosing a chainsaw, it is necessary to check the crankshaft bearings for play. To do this, shake the flywheel up and down. If there is play, then the bearings must be replaced.

Also do not forget to check the play of the crankshaft connecting rod. To do this, the piston must be locked in the upper position and gradually shake the flywheel to the left to the right, simulating its natural movement. If there is play, then the Partner 350 crankshaft must be replaced.

Gas Tank Breather Chainsaw Where Is It

Why won't the chainsaw start? Frequent malfunctions and methods for their elimination

Chainsaws are light in design and reliable in operation.

With the right appeal, breakdowns appear occasionally and are quickly eliminated if the owner knows where to find the cause.

And yet, the question of why the chainsaw does not start cannot be answered with certainty. This tool in its own database is an ordinary two-stroke gasoline engine. For its normal operation, four conditions are needed: fuel, air, spark and lubricant.

The carburetor is responsible for the manufacture of the air-fuel mixture, the air cleans the filter from dust, the spark is made by the ignition unit and the candle, and the lubricant is in gasoline.

The reasons why the chainsaw refuses to start must be found one by one, starting from the usual ones and moving on to more complex ones. Anyone who immediately rushes to disassemble the carburetor when the chainsaw does not start well on a hot one is at great risk. This assembly is best repaired and adjusted in a specialized workshop, and not on the knee.

By the way, some manufacturers of chainsaws, so that users do not climb into the carburetor to change the composition of the fuel mixture, make the jets unregulated.

For trouble-free operation of the chainsaw, special attention must be paid to fuel . If the fuel mixture is not properly prepared, then even a reliable Husqvarna will not start. In this case, the owner will begin to look for the cause of the malfunction anywhere, but not in the fuel. To eliminate this factor, you must always prepare a fuel mixture from high-quality gasoline and the brand of oil that is indicated in the instructions.

It must be done in such quantity that it is fully developed in 1-2 weeks . If you keep it in a canister for a month, then gasoline will lose its octane qualities and you are guaranteed problems with the saw.

Quite often, chainsaw malfunctions occur due to filling the candle with gasoline at the time of launch. This problem is eliminated by turning out and drying the spark plug (without calcination!) At the same time, excess fuel is drained through the spark plug hole, after which a 20-30 minute break is taken, then the spark plug is put back in place and the start is repeated. A good owner always has new spark plugs in stock so that when troubleshooting, this part is excluded from the list of suspects.

READ How to Properly Adjust the Carburetor on a Husqvarna Chainsaw

The absence of a spark is often caused not only by the failure of the candle , but also by poor contact between its tip and the high voltage wire. If this connection does not cause suspicion during the check, but the spark does not appear when the starter is turned on, the electronic ignition unit is to blame. This node is not repaired, but replaced with a new one.

Remember that spark plug inspection provides important information. If it is dry, then no fuel enters the cylinder and you need to check the entire supply chain, starting from the carburetor. Black soot indicates improper adjustment of the carburetor, supplying too much fuel to the mixture or overflowing oil into gasoline.

Gas tank ventilation

The process of replacing and installing a breather

and plugs for fixing
chainsaws
(Huskvarna) 236, 240.

Fuel tank check valve

carburetor? There is only one reason, the formation of a vacuum in the tank. Solving the problem, pull out the white plug, clean

If the chainsaw starts and stalls when you press the gas, this indicates a poor fuel supply. The cause may be a clogged fuel filter or carburetor jet. The first node can be checked and cleaned very quickly, but in the second case it is better to trust the experts.

Disassembling and cleaning a chainsaw carburetor requires experience and accuracy . Therefore, only those owners who have repeatedly and successfully performed this procedure are usually taken for it.

READ Chainsaw Carburetor Adjustment Carver

The air filter should also be given attention so as not to look for the cause of chainsaw malfunctions in the wrong direction. If it is clogged with dust, then you cannot count on easy start-up and stable operation.

Each chainsaw model has its own characteristic and easily fixable faults . Therefore, do not rush to disassemble and repair, but rather read the reviews of the owners on the forums. For example, Stihl chainsaws may not start due to a banal clogging of the breather.

This valve equalizes the pressure in the gas tank as fuel is consumed. When it clogs, a vacuum forms in the tank and fuel stops flowing into the carburetor. This disease is treated by cleaning the breather with an ordinary sewing needle.

Eliminating the breather from the list of suspects is not difficult . To do this, disconnect the fuel hose from the carburetor and see if fuel flows out of it. When gasoline flows in a full stream, the breather is clean, but if fuel does not flow from the gas line or flows out very slowly, then the cause of the malfunction has been established.

Many owners of new Stihl chainsaws are frightened by the increase in idle speed after the first tanks of gasoline have been developed. Experts consider this behavior of the saw to be normal and indicate that the running-in of the engine and carburetor is proceeding normally. Therefore, do not rush to contact the service, but simply reduce the engine speed with the carburetor idle screw.

If the power drops and the chainsaw stalls at idle , do not forget to check the muffler, which may be clogged with tarry exhaust deposits. Do-it-yourself Husqvarna 142 chainsaw repair, purchase where the breather is located. Cleaning the exhaust port and muffler eliminates these problems.

It is especially unpleasant for the owner when all possible causes seem to be eliminated: a new serviceable spark plug is installed, the carburetor is neatly and correctly cleaned, the fuel is normal, but the chainsaw still does not want to start.

READ How to Test Chainsaw Magneto

Tools

In order to disassemble the Partner 350, you will need several specific tools:

Clutch wrench (you can buy or make your own from a socket of a suitable size).
Piston stopper.
Torx hexagon set.
Soft metal punch.

For ease of disassembly, Partner 350 will need tweezers and a medical clip. Of the usual tools, you must have screwdrivers or a cordless drill with a set of nozzles, a hammer.

Algorithm and description of the disassembly process

If you need to completely disassemble the Partner 350 chainsaw, the first thing disassembly begins with is cleaning the saw with a compressor. Next, the chainsaw nodes are removed in the following order:

chain brake cover and saw set;
top cover;
saw handle;
starter.

After the first stage of disassembly is over, we re-clean the chainsaw with a compressor, since we already have access to the air ducts, which in most cases are heavily polluted with wood dust.

In the next step, it is convenient to remove the air filter housing and Partner 350 carburetor.

After removing the carburetor, the cylinder inlet port must be plugged with a rag, this will protect against foreign objects entering the engine crankcase.

The muffler can be removed either immediately after the carburetor has been removed, or after the engine has been removed. The outlet window is also closed with rags.

Next, remove the clutch and flywheel.

To do this, you will need to use a piston stopper by installing it in the candle hole.

The clutch on all Partner 350 chainsaws is unscrewed in the direction of the chain, this is done so that it does not unwind during operation. The flywheel nut has a standard thread and is unscrewed with a socket by 13, counterclockwise.

After removing the clutch, access to the oil pump appears, it must also be removed.

At the last stage, you need to unscrew the screws of the engine and remove it from the case.

Assembly Partner 350

In order to correctly assemble the Partner 350, it is necessary to install all the elements in the reverse order of removal.

If this is the first time you have encountered the repair of the Partner 350 chainsaw, then when disassembling, put the parts in the order in which they were removed. This will allow you not to get confused and not to forget to install any node.

An important feature of the Partner 350 chainsaw engine assembly is that the crankcase cover is installed without a gasket. Instead, a red sealant is used, which is applied in a thin layer to the crankcase installation site. Before applying the sealant, it is necessary to degrease the crankcase cover and its installation site, for better adhesion of the sealant.

Setting the clearance of the flywheel and coil (ignition adjustment)

During the assembly process of the Partner 350 chainsaw, if not only the flywheel, but also the ignition coil was removed on it, a gap must be set between them. To do this, the flywheel is first installed, then a piece from a one and a half liter plastic bottle is placed on it, and then the coil is placed and fixed with two fixing screws, while the flywheel must be turned to the coil with magnetic contacts.

How to disassemble a chainsaw

Chainsaw repairs can only be carried out after the tool has been disassembled. It must be done as carefully as possible, while each part is recommended to be cleaned with detergent and dried thoroughly. Only after this is it possible to assemble the tool.

How to remove an asterisk

To access the chainsaw sprocket, you need:

Remove the crankcase cover, chain set and bar, and then the air filter.
Unscrew the spark plug, instead of which insert the piston stopper.
Unscrew the clutch, having previously installed the puller in the hole for the universal key. This will allow access to the asterisk, after which the latter can be removed.

After the defective part has been removed, the sprocket can be replaced with your own hands.

How to replace the oil pump

The removal of the oil pump occurs in the following sequence:

Remove the chain set, and then unscrew the bolts that secure the chain guide to the housing.
Now you need to remove the pump and divide it into two parts, then remove the gasket and put a new one in its place.

If these actions do not correct the problem, then the oil pump must be replaced. All assembly steps must be performed in reverse order.

Replacing the piston group

If it is necessary to replace the cylinder and piston of the Partner 350 chainsaw, it must be disassembled according to the algorithm described above. The piston is fixed at the top of the crankshaft connecting rod with a piston pin. A separator with roller bearings is installed between the pin and the connecting rod.

To replace the piston and cylinder, it is necessary to remove the piston from the cylinder and remove it from the crankshaft, for this, on one side of the piston, using nippers and a small screwdriver, the piston pin stopper is removed.

Then, from the opposite side, it is squeezed out with a small screwdriver. If the pin comes out tight, it can be slowly knocked out with a hammer and a drift that is suitable in size, but smaller than the diameter of the piston pin bore.

The new piston is installed on the crankshaft so that the arrow on the piston cover points in the direction of chain movement.

To check the correct installation, it is necessary to take the crankshaft with the piston installed on it so that the shaft on which the flywheel is installed is in your left hand, while the arrow should look away from you.

After the new piston is mounted on the crankshaft, a ring is installed on it, after which the piston is inserted into the cylinder, while the parts must be lubricated with engine oil, which will not break the ring and facilitate the process. Next, the crankcase is installed.

Service center masters use the algorithm for replacing the piston group, which allows you to work without completely disassembling the Partner 350 chainsaw. You can see how this replacement takes place in the video.

Where is the breather

The Partner 350 chainsaw, like other chainsaws, has two breathers. One is responsible for equalizing the pressure in the oil tank, the second - the fuel. The oil tank breather is installed next to its cover, and a special disposable metal plug is installed on top of the breather to allow air to pass through.

The Partner 350 fuel tank breather is located in the carburetor installation area, like the previous one, it is closed with a plug.

Tip: The breathers must be replaced when a vacuum is created in the tanks and the fuel and oil supply stops.

Fuel Hose Replacement On Chinese Chainsaw

Content

yourself chainsaw repair

All chainsaw malfunctions can be divided into two main groups: engine problems 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 does not start;
starts, but stalls;
works unstable;
does not develop power, i.e. Runs fine at idle, but stalls under load.

When repairing a chainsaw with your own hands, it is necessary to act by way of exclusion. alternately inspect all possible causes of a malfunction, starting with those whose verification and elimination takes the least time (see here about the design and operation of a two-stroke motor).

Ignition system

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

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

If the candle is dry, this means that the problem is most likely not in the ignition system, but in the fuel mixture . You can wrap the candle back and take on the fuel system. If the spark plug is heavily splattered with the fuel mixture, then there is an excess of it. This may be due to misalignment of the carburetor or a violation of the rules for starting. The candle is wiped and dried, the cylinder is drained by cutting off the fuel supply and working as a starter. to ventilate the combustion chamber and remove excess fuel. Then install the candle in place and repeat the start.

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

The ratio between oil and gasoline in the mixture may be violated, the carburetor is not adjusted, or low-quality oil is used. The candle is washed in gasoline, cleaned with a needle or awl from soot, the electrodes are cleaned with fine sandpaper and put in place.

In all these cases, it will not be superfluous to check the gap between the spark plug electrodes. Depending on its brand, it should be in the range of 0.5-0.65 mm. You also need to check the sealing gasket of the spark plug. 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 a spark plug test, there is good reason to believe that the malfunction is in the fuel system, you need to check the spark plug for a spark. At least to be sure that everything is in order with this. For this:

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

READ Chainsaw Chain for Rip Sawing Difference

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

The reason for the lack of a spark may 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 the saw was disassembled with the removal of the flywheel and the ignition module before that. The gap is set using a 0.2 mm thick gasket placed between the flywheel boss and the ignition module. A defective ignition module must be replaced.

After checking the ignition system in this way and not finding a malfunction, you can proceed to the fuel mixture .

Fuel supply system

. If by inspection of the spark plug it was found that fuel was not entering the cylinder, all possible reasons for this should be considered. It could be:

non-flow of fuel from the tank due to a clogged hole in its cover (breather), while a vacuum is created in the tank that prevents fuel from flowing out;
contamination of the fuel filter installed in the tank;
no or insufficient flow of the fuel mixture from the carburetor into 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 with a full jet, the breather and filter can not be checked, if it does not flow or flows weakly, we can assume that the cause of the malfunction has been found. The breather is cleaned with a needle. The fuel filter is removed through the filler hole of the empty fuel tank, with a wire hook, together with the 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.

Replacing the fuel hose on a 3816 chainsaw

How to replace the fuel hose

on
chainsaw
what to do if oil is leaking
chainsaws
? In this video, we are

Replacing the fuel hose on a Husqvarna 136 chainsaw

Fuel hose replacement

on
chainsaw

hose
was also replaced .

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

As a rule, chainsaw repair is not complete without cleaning the air filter, since it gets dirty pretty quickly. When this happens, the air supply to the carburetor is reduced, the fuel mixture at the outlet of the carburetor is too rich, which disrupts the normal operation of the engine. Carefully remove the dirty filter for cleaning so that dirt from it does not get into the carburetor. The filter should be cleaned or washed in water with some detergent, dried and reinstalled.

READ DIY Husqvarna 236 Chainsaw Adjustment Carburetor

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

If adjusting the carburetor 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 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 imperceptibly jumping out of their places and irretrievably lost, so that, having disassembled this capricious device, you can not assemble it.

Below is a diagram of another chainsaw carburetor .

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

Muffler

. Often the cause of engine failure, especially when the engine runs normally at low speeds and stalls under load, is clogging of the muffler spark arrester with combustion products, which prevents normal exhaust. Repair in this case consists in removing the muffler, disassembling (if it is collapsible) and wet cleaning it from carbon deposits using detergents. The non-separable muffler is dried with a hairdryer after washing. Remember that soot contains substances that are carcinogens, and dry cleaning, as a result of which their inhalation is possible, is unacceptable. When removing the muffler, plug the engine outlet with a clean rag.

One of the reasons why a muffler can become clogged. this is the use of a fuel mixture with an excess amount of oil (the amount of oil is more than recommended by the manufacturer), and the use of either oil not intended for two-stroke engines or low-quality oil.

Cylinder-piston group

. Malfunctions of the cylinder-piston group are among the most serious. This is the wear of the cylinder and piston, scratches and scuffs on their surface, wear or sinking in the grooves of the piston rings, wear of the crankshaft bearings. Most of these faults result in a drop in cylinder pressure and, as a result, the engine cannot be started or is unable to deliver full power. There are several ways to assess the condition of the cylinder-piston group (CPG).

You can remove the muffler and look through the window that opens, in which part of the side surface of the cylinder is visible. Despite the limited nature of the review, it is still possible to obtain a general idea of the state of the CPG in this way.

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

READ Chainsaw Won't Start Malfunction Causes

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 latter for a working chainsaw should be at least 8-9 atm (0.8-0.9 MPa). With its decrease, the engine power also decreases. At a pressure of 5 atm, the engine may work, and will, but only at idle.

It is possible to accurately assess the condition 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. With regard to the cylinder, when the surface is worn out or damaged, it is possible to bore it to the repair size. The cause of low compression may be wear or coking of the piston ring. A serviceable ring should be clean from carbon deposits, sit freely in the piston groove and tightly 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 pipes to the pump fittings. They may fall off or crack. Violation of the tightness of the oil pipeline, in addition to drips, can also lead to insufficient chain lubrication. The pump begins to suck in air, which affects its performance. Violation of the tightness is eliminated by replacing the tubes or sealing them with sealant.

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

chain brake

Replacement of wearing parts

If you do not replace wearing parts on time, their excessive wear will adversely affect the rest of the chainsaw. In particular, if the tire and drive sprocket are not changed in time, increased vibration will adversely affect the crankshaft bearings. The limiting depth of the sprocket teeth should be 0.5 mm. In practice, sprockets are often operated to a wear depth of 1 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 out, it is necessary to change the tire itself, by this time its wear reaches the limit values.

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

When installing a new chain, a new drive sprocket should be installed. Since the life of the drive sprocket is twice the life of the chain under normal load, it is advisable to use one sprocket to alternate between two chains. Due to this, the sprocket and chains wear out almost simultaneously. If a new chain is put on a worn sprocket, then the drive links of the chain wear out much faster. For profitable operation of the chainsaw, always use together: one guide bar, two chain sprockets, four saw chains.

Troubleshooting common problems

The Partner 350 has popular faults that owners of these saws can diagnose and fix on their own. Let's take a closer look at popular malfunctions and how to fix them yourself.

Silences when you press the gas

If the Partner 350 stalls when you press the gas, then most likely there are problems with the fuel system. The most common failure is an incorrectly adjusted carburetor or its malfunction, as well as extraneous air leakage.

Tip: If the chainsaw stalls with increasing speed, do not immediately adjust the carburetor. Start by checking the engine for foreign air leaks. One of the signs of air leakage is increased idling.

Runs and dies

If the Partner 350 starts up and immediately stalls, then, as in the previous case, there may be several reasons, but the most common is a difficult fuel supply. It is worth starting troubleshooting by checking the condition of the fuel filter and lines. If fuel is supplied normally, then check the spark and try to start the chainsaw on a new candle, as the saw may stall due to interruptions in sparking.

It is also necessary to check the draft of the air damper. If it does not open the choke or does not open fully, then the engine may stall from excessive fuel enrichment.

Lack of chain lubrication

There are several reasons for the lack of lubrication on the Partner 350 chainsaw, and in this case we can list them all.

Oil line break.
Clogged oil filter.
Worm gear defective.
Clogged line or pump.

How to solve oil pump problems is described above.

Pouring a candle

A very common problem that Partner 350 owners have to face. The first thing to start with is to replace the spark plug with a known good one. If it doesn’t help, the spark is good, but the engine floods, then the reason is hidden in the carburetor settings. Instructions for diagnosing and setting up a carburetor for Partner 350 are on our website.

Ignition

fuel mixture

disassemble and clean the breather

ventilation of crankcase gases of VAZ-classic cars, cleaning tips, tips.

For more information about repair and tool selection, visit our website www.LookTool.Ru, we are glad to everyone.

Is the candle wet? Completely “thrown” with a gasoline-oil mixture? Your petrol trimmer, the repair we are trying to describe, has problems with carburetor adjustments. This often happens when non-specialists tried to configure it. If you do not have experience, we strongly advise you to contact a service center, since by your actions you may well burn the entire piston system.

However, not everything is so bad: if you violate the rules of a cold start, all the time trying to pump up the fuel mixture, then this can easily lead to throwing.

Another thing is when the candle is covered with a thick layer of black soot. In this case, the gasoline trimmer, the repair of which we describe, was exposed to a poor-quality fuel mixture. Maybe the point is again in the wrong adjustment of the carburetor, which produces a too saturated fuel mixture. Just change the spark plug.

Fuel supply

Often, the lack of gasoline entering the combustion chamber is due to the fact that a lot of dirt has accumulated in the gas tank, which simply clogged the supply hose. as shown in Clean the breather How to repair the starter on the trimmer. Disconnect the fuel hose. If fuel does not flow from it, then a clogged fuel filter or breather is to blame. The latter can be cleaned with a needle, and the former should be completely changed every three months.

Among other things, the repair of gasoline trimmers "Patriot" often requires the replacement of the air filter. Being clogged, it prevents the formation of a normally enriched fuel mixture.

And one more thing: often a muffler clogged with soot is to blame for everything. It must be dismantled, washed in kerosene or burned on a burner. This is especially often done by those for whom the repair of Husqvarna gasoline trimmers is a daily job.

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Chainsaw piston group

The dimensions of the cylinder-piston group are determined primarily by the diameter of the piston made of heat-resistant aluminum alloy. Regardless of the model, the CPG chainsaw consists of a cylinder, a piston, a holding pin and two clamps.

Chainsaw Cylinder Mirror

When buying a piston chainsaw, you should pay attention to the inner surface of the cylinder, which must be polished and have a glossy sheen. In the presence of damage, scratches, experts do not recommend installing such a cylinder.

In order to increase compression in the working unit and, as a result, increase power, many manufacturers install two piston rings each. The compression rings of the chainsaw made of special cast iron fit snugly against the cylinder, as a result of which the combustion chamber is sealed.