How to change a piston on a STIHL 180 chainsaw

Malfunction of the fuel supply system

As mentioned earlier, the examination of a faulty sawing tool should begin with establishing the presence of gasoline in the fuel tank, as well as determining the technical condition of the fan.

Repair of a STIHL chainsaw in the event of a malfunction of the fuel supply system.

When checking the fuel level, be sure to open the lid of the gas tank. This should be done even if the owner of the tool has confidence that there is gas in the tank.

Often the saw cannot be started due to lack of fuel in the combustion chamber. A prerequisite for this in most cases is the usual clogging of the fan. A special bypass valve that serves to equalize the pressure in the tank with gradual consumption of gasoline. In this case, the repair of the chainsaw is reduced to a thorough cleaning of the breathing tube with a conventional sewing needle.

Description of the piston group of the STIHL 180 chainsaw

On a STIHL chainsaw, one hundred and eighty piston group has a diameter of thirty-eight mm. The size of the CPG of the chainsaw is determined by the piston diameter, the cylinder is slightly larger. The MS standard comes with one hundred and eighty CPG supplied complete with piston pin, two piston rings and two back-up rings.

The distinguishing feature of the CPG on the STIHL MC 180 is that it has two compression rings, whereas 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 compression in the engine, thereby improving start-up.

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The STIHL MS 180 chainsaw is an indispensable tool for harvesting wood and other wood construction work. It is one of the most recognized gardening devices that comes with multifunctional features.

The tool weighs about 4 kg. The power reaches 1.5 kW and the busbar length is 35 cm.

change, piston, stihl, chainsaw

Note that from a semi-professional device for this model of the saw got electronic ignition and a fairly fast chain tension. In addition, the STIHL MS 180 saw has 2 tanks for gasoline and an oil mixture.

Reduced vibration is one of the main features.

This result is achieved thanks to 4 shock absorbers. It’s no secret that high depreciation has a detrimental effect on human health and in Europe they have been struggling with it for a long time.

It should be noted that it is not advisable to disassemble this saw on your own without special instruction, in this case it is better to entrust the device to the masters.

Carburetor repair STIHL MS 180

Repairing a STIHL MS 180 carburetor is a difficult process. Note that during repairs, the risk of abrupt changes in the cylinder-piston group is practically absent.

If the chainsaw does not start, then follow these steps:

1) open and close the gas tank cap;

2) it is advisable to remove the candle and then drain;

If after this there were no positive results, then it is better to check the condition of the air filter, the process of supplying gasoline and the functioning of the spark plug.

This problem is associated with the valve (blind man), which is clogged, and as a result, a vacuum is formed. To eliminate this inconvenience, you need to clean the valve (blind man) with a needle.

Check the filter systematically, if the muffler is clogged, then the device will not be able to deliver the power that is built into it.

If the chainsaw was purchased with a guarantee (as a rule, there is no other option), immediately hand it over to the service.

Thus, the STIHL MS 180 chainsaw is very convenient to use, has good ergonomics and a number of significant advantages.

DIY STIHL ms170 (piston ring problem) Part1

We investigated 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 can overlap, and for proper repair, an integrated approach to solving the problem is needed. 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.

Service prices

Name of works Price in rubles
Diagnostics (diagnostics are not paid for during repair) 600 rbl.
Comprehensive maintenance (consumables and labor) 1800 rbl.
Engine bulkhead 1500 rbl.
Replacing the cylinder 1500 rbl.
Replacing the engine crankshaft 1500 rbl.
Replacing the piston 1500 rbl.
Replacing the piston ring 1500 rbl.
Flywheel replacement RUB 500.
Replacing the flywheel key RUB 500.
Replacing engine oil seals 1500 rbl.
Replacing the crankcase RUB 500. 900.
Replacing the crankcase gasket RUB 500. 900.
Replacing the spark plug 100 rbl.
Replacing the carburetor and adjusting RUB 500.
Replacing the fuel tank 500. 1000 rubles.
Replacing the fuel priming primer 100 rbl.
Replacing shock absorbers 100. 500 rubles.
Replacing the drive sprocket RUB 500.
Replacing the brake cover 100 rbl.
Replacing the brake spring 100 rbl.
Replacing the oil pump RUB 500.
Replacing the oil line / filter RUB 500.
Replacing the intake manifold 300 rbl.
Replacing the chain tensioner 200 rbl.
Replacing the clutch RUB 500.
Replacing the clutch spring RUB 500.
Replacing the magneto RUB 500.
Replacing the fuel hose 200 rbl.
Replacing the fuel line / filter 300 rbl.
Replacing the trigger / throttle block RUB 500.
Replacing the air filter 100 rbl.
Replacing the oil pump plunger (prof.) RUB 500.
Replacing the muffler 200 rbl.
Replacing the recoil starter 200 rbl.
Replacing the starter spring RUB 500.
Replacing the starter cord 600 rbl.
Replacing the dog / spring 300 rbl.
Replacing the ignition switch 200 rbl.
Repair of a recoil starter 500. 1000 rubles.
Carburetor repair 600. 2000 rubles.
Carburetor adjustment RUB 500.
Throttle cable adjustment 100 rbl.
Cleaning the fuel system 600. 800 rubles.
Flushing the air filter 200 rbl.
Flushing the gas tank RUB 500.

When a piston needs to be replaced

There can be quite a lot of circumstances for which the piston needs to be changed, as in general, and one hundred percent piston, but all of them can be divided into natural ones and those that appeared as a result of incorrect operation. how to remove the clutch disassembling the STIHL 180 chainsaw oil on the chainsaw is not. Replacing the piston on a STIHL 180 chainsaw: when and how to change it. Chainsaw starter repair replacement of the STIHL ms 180 chainsaw starter spring STIHL 181. Repair of the STIHL ms230 chainsaw disassembly of the STIHL 180 chainsaw part 1 replacement of the piston group. Natural wear is caused by long-term use of the STIHL 180 chainsaw. There are even more artificial ones, for example:

  • overheating of the motor and the occurrence of thermal seizures;
  • ingress of a foreign body into the cylinder and the occurrence of mechanical scoring;
  • breakage of the piston ring as a result of exceeding the highest engine speed;
  • breakage of the piston skirt due to overspeed;
  • the introduction of poor 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 decreases;
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It is necessary to diagnose the CPG if the STIHL 180 ms has 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. Replacing the piston group in a chainsaw or working at high speeds. On STIHL chainsaws ms 180 carburetor adjustment instructions for STIHL chainsaws ms 660. In any case, with reduced compression, for further diagnostics, you must completely disassemble the saw.

It is possible to determine the presence of seizures on the piston, as well as a broken 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 them with a small screwdriver. There will be slight movement on the working rings, a defective or jammed piston ring will not move.

The advantages of repairing STIHL chainsaws in the “Direct Hands” service center

By ordering a service from us, you will have access to the following benefits:

  • only experienced craftsmen trained by STIHL;
  • different payment options;
  • the workshop works seven days a week;
  • consultations are provided free of charge;
  • we cooperate with individuals and legal entities;
  • the breakdown is eliminated in 1-2 days, even during the peak season;
  • are fixed and do not increase in the course of work.

Major breakdowns

Before handing over a broken chainsaw to a repair service, you should try to identify the breakdown yourself and, possibly, fix it. For this, there is a chainsaw repair manual, which is always included in the delivery set. In it you can find answers on how to carry out repairs in cases when:

  • the chain broke;
  • the saw will not start;
  • the saw starts up and stalls in the fight;
  • the chainsaw works, but not at full capacity.

Description of the piston group of the STIHL 180 chainsaw

On the STIHL 180 chainsaw, the piston group has a diameter of 38 mm. replacing the piston group on a STIHL chainsaw how to wind a line on a mower. If in the photo the electronic ignition is turned 180 and how about the Ural chainsaw? The dimension of the chainsaw CPG is determined by the piston diameter, the cylinder is slightly larger. replacing the piston group on the STIHL ms180 chainsaw how to make the device yourself. 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 purchasing a replacement cylinder head for a STIHL ms chainsaw. If there is damage to the inside of the cylinder, it is not necessary to install such a cylinder.

Stihl ms 180 chainsaw piston change (quick view)

CPG device

So, what is included in the CPG (cylinder-piston group):

  • Piston
  • Cylinder
  • Rings (oil scraper and compression)

The CPG is the main unit of the engine, the malfunctions of which inevitably lead to costly repairs. To maintain it in working order, you just need to strictly follow the instructions and follow some general rules:

  • Use quality oils, diluted in the exact proportion indicated by the manufacturer.
  • Avoid overheating the engine.
  • Observe the work standards for the chainsaw class (household, semi-professional, professional).
  • Always use a properly sharpened chain set in the correct direction.

We examined the main causes and malfunctions of the STIHL chainsaw ms 180 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.

How to change a piston on a STIHL 180 chainsaw

If there is a desire to replace an old piston installation with a newer one, you should know how to do it correctly and not follow a certain method of action. You also need to have a small slotted screwdriver, a special STIHL combination wrench, a power screwdriver, a hammer, a punch made of soft material, a compressor not a STIHL piston stopper.

When starting to work on replacing the piston with a different piston group assembly, the chainsaw must be cleaned of contamination with the greatest quality. Further, the work is carried out according to the following method:

  • The top cover is removed from the saw the spark plug is not turned out.
  • 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.
  • Loosen the two screws securing the carburetor and air filter. Remove 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.

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 CPG of a chainsaw is determined by the diameter of the piston, the cylinder is a bit more than simple. In the complete set, the standard CPG MS 180 is supplied complete with a piston pin, 2 piston rings and 2 retaining rings.

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The inner surface of the cylinder can be completely sanded and have a glossy shine, where you need to direct attention when buying a spare cylinder for your STIHL ms chainsaw. If there is damage to the inside of the cylinder, it is not necessary to install such a cylinder.

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How to change a piston on a STIHL 180 chainsaw

As needed, replacing the old piston and the newest installation, you should know how to do this correctly and follow a certain method of action. You also need to have a small slotted screwdriver, a special STIHL combination wrench, a power screwdriver, a hammer, a punch made of soft material, a compressor and a STIHL piston stopper.

When starting work on replacing the piston, either piston group assembled, the chainsaw must be cleaned of contamination with maximum quality. Further, the work is carried out according to the following method:

  • The top cover is removed from the saw and the spark plug is turned out.
  • 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 driven 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.
  • Loosen the two screws securing the carburetor and air filter. Remove filter, engine control lever and STIHL carburetor.
  • Remove ignition coil and muffler.

If such operations are carried out, you need to additionally clean the saw of dirt, then turn it upside down and unscrew the four screws securing the motor to the chainsaw body. By unscrewing the screws, the engine is separated from the case and cleaned one more time.

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

Replacing the piston group on the STIHL MS180 chainsaw

Here we will show you how to replace the piston group on the STIHL MS180 chainsaw, crankshaft oil seals.

A distinctive feature of the CPG on the STIHL MC 180 is that it has two compression rings installed, although in fact all of its main rivals have only one. As the manufacturer convinces, the installation of a pair of rings makes it possible to better stabilize the piston in work, enhance its cooling and increase the compression in the engine, which is why starting is improved.

When needed replacement piston

The circumstances for which the piston needs to be changed, as in general, not a lot of piston ones, you will like a lot, but our client is left to divide them into natural ones that did not appear after the end of incorrect operation. Natural, this is the wear caused by the long-term use of the STIHL 180 chainsaw. Artificial ones are still difficult, nettles:

    overheating of the motor, no thermal seizure;

It is necessary to diagnose the CPG based on the criteria if STIHL 100 ms of eighty has dramatically lost power otherwise it does not start, while the starter of the tool does not turn. If the passage if the starter turns, but the saw does not start, a spark is immediately encountered, non-fuel enters the cylinder correctly, you need to measure the compression in the engine.

If you suspect problems with the CPG, it is better to contact a service center authorized by the manufacturer, since it is exclusively in the computer to be without full analysis to accurately diagnose the malfunction, not if you need to carry out high-quality repairs.

How to avoid scuffing the piston of a chainsaw

Greetings, dear readers! Spring is coming, and many will go to the country. And this means that the time has come to share your experience as a repairman for garden motor vehicles. This article is just part of a small series. Here are links to other articles:

During the work of the workshop, I have accumulated an impressive collection of photographs of various faults, a special position in which a collection of photographs of failed cylinder-piston groups occupies.

The photos show cracks and a hole in the piston crown, as well as splashes of molten aluminum in its interior. This happened due to the fact that the owner of this grass trimmer put the wound tool aside and began to chat with a neighbor in the country. After chatting for about five minutes, he gave the gas to full (you cannot work at half a gas ) and started to work, but the grass trimmer instantly stalled and stopped starting because the piston bottom began to overheat during idle time and simply melted.

Two-stroke engines for garden equipment are cooled due to two things: forced blowing of the cylinder by the flywheel impeller and the air-fuel mixture entering the crankcase. The first cools the cylinder more, the second the piston. Never leave your chainsaw idling for more than a minute, rather turn off the engine.

They can occur for a number of reasons, the first of which is dry contact. As a rule, a large number of small seizures on the piston indicates that pure gasoline was used during operation, and not a fuel mixture. Let me remind you that the working revolutions of the chainsaw are in the region of 11-12 thousand per minute, with such a speed the chainsaw will not work “dry” even for a minute. A similar picture will be observed when using old fuel. As a rule, seizures appear on the side of the exhaust window, in the area most critical for oil starvation.

Specifically for this piston, it is quite difficult to say from what it suffered more. Judging by the soot on its upper part, the oil was poured anyhow, without observing any proportions. The muffler of this unit was also clogged with soot, and clear fuel was drained from the tank. Apparently, it was pure gasoline, or a very old mixture. But the old mixture most often becomes cloudy, so two conclusions can be drawn: either the mixture is old, but the oil in it is not two-stroke (some of them pour out motor oil, unwittingly), or it is pure gasoline.

Engagement and breakage of piston rings.

And here is an example of what happens if, when preparing the fuel mixture, the proportion is violated and the oil is poured much more than the required amount. As a result of using a mixture with a high m of oil, or a mixture with oil not intended for two-stroke engines, intense ash formation was caused, followed by the occurrence of piston rings, one of which broke off and caused critical damage to the piston. It should be noted that rings breaks not so often, I would even say that it is quite rare, but this does not make the engine easier.

In the technical regulations for old Soviet motor vehicles, I often came across two “recipes” for preparing a fuel mixture for one and the same machine. One proportion was considered more environmentally friendly (the one with less oil), the other extended the engine life (the one with more oil). But that was before, with old technology and old oils. Nowadays there is a continuous struggle to reduce the harmfulness of exhaust, oils have a completely different composition and the engine is of a different design, therefore I recommend that you use the proportion that the manufacturer himself indicated on the canister of the oil that you have chosen.

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And here is an example of a piston with a coked ring and a small seizure. Fortunately, this unit was restored without replacing the CPG, escaping only by cleaning the piston from carbon deposits, a little grinding and replacing the piston ring. The entire surface of the piston is covered with tar and ash deposits, here the use of a low-quality fuel mixture is beyond doubt. The cylinder was slightly damaged, small workings and lack of honing are visible, but no scoring is observed.

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 purchasing a replacement cylinder head 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 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:

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, then mount the piston pin circlips, while positioning them so that the snap ring break point is directed downward. This is necessary in order to prevent the circlip from spontaneously jumping out when the engine is running (according to the STIHL manufacturer’s instructions). 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 carried out according to the reverse disassembly algorithm.

It stops and does not work in standby mode:

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Chainsaw engine breakdown

During operation, parts of the cylinder-piston group of the saw fail due to friction forces, high temperatures and loads. If the tool does not reach full power at startup and stalls at idle speed, a possible problem could be damage to engine parts. To disassemble the power unit, it is necessary to unscrew 4 bolts and remove the cylinder. The owner is required to carefully inspect its internal work surface for the presence of chips, nicks and cracks.

Even the slightest damage to the “mirror” of the cylinder can negatively affect the compression of the chainsaw engine and its performance.

Cylinder-piston group of the STIHL MS180 chainsaw

When diagnosing an internal combustion engine, we also perform a visual inspection of the piston and compression rings. Made of aluminum alloy and cast iron, respectively, they are more exposed to abrasion loads than a steel cylinder. In case of breakage and excessive wear of the piston rings, it is necessary to replace them.

If, upon visual inspection, the ovality of the cylinder working surface is observed, it will need to be bored. To do this, we measure its diameter over a larger size, select the piston and perform the subsequent machining.

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.

Chainsaw won’t start

If you find it difficult to start a chainsaw, many people immediately sin with the carburetor. In fact, there are several options, and the cause of the problem can be anything:

If none of the above methods helped, the cause is more serious. Malfunction of one of the components of the connecting rod and piston group. In this case, it is recommended to take the chainsaw to a service center.

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

When passing through, if the saw does not start after replacing the piston, you need to check the fuel supply to the chamber, and also diagnose the accounting of the ignition system. Often in the process of installing the control lever on the chainsaw, craftsmen forget to connect the wires coming from the ignition coil, and as a result, the spark disappears and the saw does not start.

Also, the discrepancy is hidden in the pinched fuel hose, or in this case, if it is not connected at all. You will like a huge number of circumstances, but it should be borne in mind that, provided that the work on replacing the piston is carried out correctly, the tool should start without problems and work normally.