Replacing the piston on the Stihl 180 chainsaw

When a piston needs to be replaced

There can be quite a few reasons why the piston needs to be replaced, as well as a completely piston one, but they can all be divided into natural and resulting from improper operation. Natural, this is the wear resulting from the long-term operation of the Stihl 180 chainsaw. There are much more artificial ones, for example:

  • overheating of the engine and the appearance of thermal seizures;
    replacing, piston, stihl, chainsaw
  • ingress of a foreign body into the cylinder and the appearance of mechanical scoring;
  • breakage of the piston ring as a result of exceeding the maximum engine speed;
  • breakage of the piston skirt due to overspeed;
  • the use of low-quality fuel, as a result of which the piston group of the chainsaw wears out from the side of the intake channel in the cylinder;
  • operation of a Stihl chainsaw with a dirty fuel filter, as a result of which the percentage of oil in the fuel mixture is reduced;

It is necessary to diagnose the CPG if the Stihl ms 180 suddenly lost power or does not start, while the starter of the tool does not turn. If the starter cranks, but the saw does not start, while there is a spark and the fuel enters the cylinder properly, it is necessary to measure the compression in the engine.

If there is a suspicion of problems with the CPG, it is advisable to contact a service center authorized by the manufacturer, since only there they can accurately diagnose the malfunction without full analysis and, if necessary, carry out a high-quality repair.

9.5. 11 atm. It is considered a normal indicator at which the Stihl chainsaw starts up properly and delivers maximum power, if the compression is lower, there is a possibility that there are scuffs on the cylinder-piston group, or its wear is quite large. In any case, with reduced compression, for further diagnostics, it is necessary to completely disassemble the saw.

It is possible to determine the presence of scoring on the piston, as well as the breakage of the piston ring, if you remove the muffler and conduct a visual inspection of the visible part of the piston, while the rings can be checked for elasticity by pressing on them with a small screwdriver. There will be slight movement on the working rings, a defective or jammed piston ring will not move.

How to change a piston on a Stihl 180 chainsaw

The main malfunctions of the Stihl ms 180 chainsaw are associated with the piston group. Consider the main reasons why the piston needs to be replaced. Let’s give a description of the piston and the algorithm for its replacement.

  • When a piston needs to be replaced
  • Description of the piston group of the Stihl 180 chainsaw
  • How to change a piston on a Stihl 180 chainsaw
  • Why the Stihl chainsaw won’t start after replacing the piston
  • Video
  • Outcomes

Description of the piston group of the Stihl 180 chainsaw

On the Stihl 180 chainsaw, the piston group has a diameter of 38 mm. The dimension of the chainsaw CPG is determined by the piston diameter, the cylinder is slightly larger. As standard, the MS 180 CPG is supplied complete with a piston pin, two piston rings and two retaining rings.

The inner surface of the cylinder must be perfectly sanded and have a glossy sheen, which must be taken into account when buying a spare cylinder piston for a stihl ms chainsaw. If there is damage to the inside of the cylinder, it is not necessary to install such a cylinder.

A distinctive feature of the CPG on the Stihl MC 180 is that it has two compression rings, while almost all of its main competitors have only one. According to the manufacturer, the installation of a pair of rings makes it possible to better stabilize the piston in operation, enhance its cooling and increase the compression in the engine, thereby improving starting.

How to change a piston on a Stihl 180 chainsaw

If you need to replace the old piston and install a new one, you need to know how to do this correctly and follow a certain algorithm of actions. You also need to have a small slotted screwdriver, a special Stihl combination wrench, a power screwdriver, a hammer, a soft material drift, a compressor and a Stihl piston stopper.

When starting work on replacing the piston or piston group assembly, the chainsaw must be cleaned of dirt as efficiently as possible. Further, the work is carried out according to the following algorithm:

Stihl ms 180 chainsaw piston change (quick view)

  • The top cover is removed from the saw and the spark plug is unscrewed.
  • Side cover is removed.
  • Using a power screwdriver, the stoppers are removed from the shock absorbers of the chainsaw, after which its handle is disconnected from the body.
  • Next, you need to remove the drive sprocket and starter.
  • Install the piston stopper in the spark plug hole and loosen the flywheel nut and clutch.
  • Remove the flywheel, clutch and oil pump worm drive mechanism, which is located behind the clutch.
  • Unscrew the two screws securing the carburetor and air filter. Remove the filter, engine control lever and Stihl carburetor.
  • Remove ignition coil and muffler.

After all these operations have been carried out, it is necessary to clean the saw from dirt again, then turn it upside down and unscrew the four screws securing the engine to the chainsaw body. By unscrewing the screws, the motor is separated from the housing and cleaned again.

On the removed engine, the pallet is untwisted and removed, after which the piston assembly with the crankshaft is removed from the engine.

When removing the piston from the cylinder, you must remember how it was located relative to the cylinder.

Next, using a small screwdriver, the piston pin retaining rings are removed, and the crankshaft is disconnected from the piston.

In the case when it is necessary to replace only the piston, you can install it on the crankshaft, and then mount the piston pin circlips, while positioning them so that the break point of the circlip is directed downward. This is necessary in order to exclude the possibility of spontaneous popping out of the circlip during engine operation (according to the manufacturer’s instructions Stihl). After that, the compression rings are installed, the cylinder is lubricated with engine oil and the engine is assembled.

The work of installing the piston into the cylinder must be carried out with utmost care, since the compression rings are fragile and easily break.

The crankcase is installed on the engine, a sealant is used as a gasket, after which four fastening screws are mounted and tightened crosswise. Further, the engine is installed on the body of the chainsaw. Subsequent assembly is performed according to the reverse disassembly algorithm.

Why the Stihl chainsaw won’t start after replacing the piston

If the saw does not start after replacing the piston saw, it is necessary to check the fuel supply to the chamber, as well as to diagnose the ignition system. Very often, when installing the control lever on the chainsaw, the craftsmen forget to connect the wires coming from the ignition coil, as a result of which the spark disappears and the saw does not start.

Also, the problem may lie in a pinched fuel supply hose or if it is not connected at all. Of course, there can be many reasons, but it is worth remembering that if all the work on replacing the piston is carried out correctly, the tool should start without any problems and work normally.

On the video you can watch a detailed video instruction, in which the master showed in all details how to properly disassemble the saw and install a new reciprocating saw on it. Also in the video you can see how the saw is cleaned correctly during the repair process.

We examined the main causes and malfunctions of the Stihl ms 180 chainsaw in which it is necessary to replace the CPG. But, as a rule, in each specific case, the reasons may overlap, and for proper repair, an integrated approach to solving the problem is required. Putting a new reciprocating saw on the saw does not always mean solving the problem. It is imperative to eliminate the causes of the malfunction and the tool will serve for a long time without problems and the need for repair.

The device of the cylinder-piston group of a gasoline saw

Consider the device of the cylinder-piston group of an internal combustion engine / internal combustion engine / gasoline saw.

In the figure, we see:

  • cylinder,
  • piston,
  • piston pin,
  • compression ring,
  • retaining rings.

The engine cylinder is used for combustion of the fuel-air mixture. Combustion, the exhaust gases push the piston, and it directly transfers the force to the engine crankshaft.

The compression ring provides sufficient pressure for the engine to operate in the combustion chamber.

The gudgeon pin holds the piston and the circlips secure it.

BenzoInstrument. LIKBEZ

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Documents satisfying your request: 9 [shown 5]

All my attempts to find out what kind of model it is and in what years it was produced ended. to no avail (I will be VERY grateful for you if you can help me with anything in this matter). But I can roughly imagine that in some places it is the 60-70s of the last century. If you do not change the chainsaw 1. if the piston in the cylinder is not how to dilute the gasoline. The chainsaw uses a CONTACT ignition from the BOSCH company.

The number 21554 is stamped on the crankcase. The importance of correctly installing the saw chain on the chainsaw. How to install the chain correctly. What kind of number is this. a mystery to me

There is a nameplate on the left side of the saw.

What kind of information is indicated on it for me as well. the black forest :-))).

I partially disassembled the chainsaw (for cleaning and assessing the condition of the parts). I also replaced the tip of the spark plug (it was all cracked) and installed an ignition switch (it was absent at the time of purchase of the saw). How to correctly install the rings on the piston of a two-stroke scooter published on 25.08 | author: scooter.rv.ua in the installation of rings on the piston of a two-stroke scooter, however, like a four-stroke, there is nothing. These details, as you realize, are not unique :-))). And another disadvantage is that there is no oil reservoir cover. (Everything is indicated by arrows in the photo).

Carburetor air damper actuator

There is a chain on the saw. TAKASAGO (I have never heard of such, but this is evidenced by the inscription on the cutting tooth).

Bus length. 620 mm.

DOLMAR chainsaw. About three or four months ago, this copy of the Dolmar chainsaw was in my hands.

Disassembly. assembly of the STIHL MS180 chainsaw. Compliance rate: 21.43%
Fragments of the post text. Disassembly. assembly of the STIHL MS180 chainsaw. Dismantling the STIHL MS180 chainsaw. Assembling the STIHL MS180 chainsaw.

Chainsaw PARTNER 352.

Chain lubrication system

There are several problems with chain lubrication. These include:

  • Oil leaks. If there is an oil leak, then it is necessary to inspect the pipes for integrity at the joints with the pump unions. Defective tubes are replaced.
  • Lack of oil. Most often the channels are clogged.
  • Cracks and chips on the oil pump housing. To solve the problem, you need to replace the parts.

Replacement piston group of chainsaw 4500

The video describes a detailed replacement of the piston group of a chainsaw, How to do it correctly, in stages and without.

We examined the main causes and malfunctions of the Stihl ms 180 chainsaw in which it is necessary to replace the CPG. But, as a rule, in each specific case, the reasons may overlap, and for proper repair, an integrated approach to solving the problem is required. Putting a new reciprocating saw on the saw does not always mean solving the problem. It is imperative to eliminate the causes of the malfunction and the tool will serve for a long time without problems and the need for repair.

All about the garden

Possible problems

The main problem that arises during the repair is the lack of the necessary information on how to carry out the repair. This is due to the fact that many foreign manufacturers believe that the saw should be disposed of after a certain period of time and use up. Therefore, many craftsmen have certain doubts, especially when repairing budget models.

But expensive professional models also create certain difficulties:

  • The first problem is to supply expensive spare parts.
  • For the maintenance and repair of some units, special equipment is useful.

Cylinder-piston group

It happens that the engine does not start or malfunctions due to low cylinder pressure. The malfunction may consist in a worn out piston, cylinder or bearings, sinking of the piston rings. You can consider the problem in general terms, for this you need to remove the muffler and inspect the system.

Compression in the engine can be measured by placing a compression gauge in the spark plug hole. After a while, you can draw conclusions based on the results of the measurement. You can only consider the problem by completely disassembling the system. If scratches or chips are visible on the piston, then it needs to be replaced. The piston ring must be installed in its rightful place, clean and intact.

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