How to assemble a piston on a STIHL 180

Choosing a piston for the STIHL 180 chainsaw

In this article, we will look at piston groups from the STIHL 180 chainsaw. The STIHL 180 chainsaw is the most popular saw in the world (like a Kalashnikov assault rifle), therefore, there are a lot of piston ones on it. The site zipo76.ru has a large selection of piston from different CHINESE factories. We zipo76.ru have been selling and repairing tools for a long time. We use only the best spare parts for your tool. We give a guarantee for spare parts and repairs.

The right one at the edge is ORIGINAL.

A good tool is a guarantee of quality and easy work. A good spare part is a salvation for a good tool. By purchasing a bad analogue of the Chinese piston, you will ensure: Overheating of the cylinder at idle speed; quick failure of the Chinese cylinder due to poor fuel; Short service life of the STIHL piston chainsaw.

And so, how can we choose the highest quality spare part from a huge variety of piston? The complete set of the cylinder of the piston group includes a piston pin, piston rings, two stoppers. It is not recommended to assemble a piston from different kits. For example, if you change the piston to an analogue on the original piston STIHL 180, then it does not look like for a long time and seizures will quickly appear.

It is important that the crankshaft bearing fits snugly into the piston and oil pan seat. If the bearing without effort, freely enters the seat, then you need to choose another piston.

The original is very easy to distinguish from its counterpart. The original piston piston has different abrasions, it has paint markings: brown, green, white. Also, the original must be embossed with the STIHL logo and name.

It is worth carefully examining the piston for the presence of chrome plating. On the third piston, you can see that the chromium spraying has irregularities and, therefore, we do not need such a piston for the saw. And finally, try, if you are allowed, of course, to scratch the cylinder with something and make sure of the surfacing. If everything is scratched without any effort, then there is no chrome, only aluminum. Be sure to visually inspect the piston for defects in casting defects. Everything should be smooth and without chipping of the radiator fins.

How long do the Chinese piston counterparts on the STIHL 180 last? There are many factors to consider that affect the performance of your chainsaw. Simple replacement of filters and refueling with quality fuel and oil will ensure a longer service life. Usually, according to personal observation and experience, analogs run fine, if you do not forget that the STIHL 180 is a household saw and is not intended for professional work. An analogue CHINESE piston, with large volumes of wood sawing, is enough for an average of a year.

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.

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.

When a piston needs to be replaced

The circumstances for which the piston needs to be changed, as in general, and one hundred percent piston, you will like more enough, alas, what remains for our client to do is divide them into natural ones and those that appeared during incorrect operation. Natural, this is the wear caused by the long-term operation of the STIHL 180 chainsaw. Artificial is not yet easy, for example:

    overheating of the motor and the occurrence of thermal seizures;
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It is necessary to diagnose the CPG in this case if the STIHL 180 ms has dramatically lost its power, in other words, it does not start, in this case the tool starter does not turn. For which the design is intended, if the starter turns, alas, the saw does not start, with all this, of course, the spark and fuel enters the cylinder regularly, you need to measure the compression in the engine.

If you suspect difficulties with the CPG, it is better to contact a service center authorized by the manufacturer, since it is exclusively there to accurately diagnose the malfunction without full analysis and, if necessary, carry out high-quality repairs.

Бензопила Stihl MS 180 сборка поршневой, установка коленвала

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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 100 eighty will be that it has two compression rings installed, although not practically 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 during operation, to increase its cooling, not to increase the compression in the engine, by introducing which the start-up is improved.

Stihl ms 180 chainsaw piston change (quick view)

How to change a piston on a STIHL 180 chainsaw

How to change a piston on a STIHL 180 chainsaw

The main malfunctions of the STIHL ms 100 eighty chainsaw are associated with the piston group. Let’s see the main prerequisites for changing the piston. We will give a description of the piston not a method of replacing it.

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Replacement Piston Chainsaw STIHL 180 Video

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. Let’s see the main prerequisites for changing the piston. Let’s give a description piston and the method of its substitution.

IMPORTANT. An experienced electrician has leaked into the network the secret of how to pay for electricity in half, a legal way. Read more

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.

Malfunctions and their elimination

Breakdowns caused by the operation of the device occur for two reasons: violations of operating conditions and limited service life of the chainsaw elements. As a rule, all repair operations are associated with blockages of certain units. The most time consuming process is the restoration of the engine. It will be problematic to repair it yourself without tools and knowledge, but it should not be difficult to repair the rest of the nodes with your own hands.

Removing the flywheel

The flywheel of the STIHL 180 chainsaw is tightened with great effort, so you need a head with a metal knob to remove it. The nut holding the flywheel is unscrewed by the head by 13.

To block the crankshaft from turning, you need to unscrew the spark plug and install the piston stopper through the spark plug hole, if it is not there, you can use the old cord from the starter, with knots tied to it and immersed in the cylinder through the spark plug hole.

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

After the piston is locked in the cylinder, you can unscrew the flywheel nut. The thread in the nut is ordinary, so you need to turn it to the left. Having loosened the nut, it is not necessary to remove it to the end, it is enough to unscrew it until its upper edge is equal to the tip of the shaft, after which a soft metal drift is installed on the nut and a sharp blow is made on it. Thus, the flywheel jumps off the shaft from a sharp impact and can be easily removed without the help of additional tools.

Principle of operation

Before identifying a malfunction and repairing the STIHL 180 chainsaw, you should study the principle of its operation and what structural elements it consists of. As part of the chainsaw, its main element is necessarily present. a two-stroke engine. It is he who is responsible for the reliability and performance of the device. The engine is involved in starting the chain drive and keeping it moving by the centrifugal clutch. In addition to the electric motor, the chainsaw includes:

Schimb set motor Stihl ms 180 ��‍��⚙️

  • starter;
  • flywheel, it is also a cooling unit;
  • ignition block;
  • clutch and brake mechanism;
  • carburetor with STIHL compensator;
  • air filter;
  • fuel and oil tank;
  • muffler;
  • anti-vibration system.

assemble, piston, stihl

Fuel from the tank enters the carburetor, where air from the cleaning unit is mixed with it. From the carburetor, the air / fuel mixture enters the engine. The saw carburetor has one miter screw that controls the idle speed. All device settings are made at the factory and ensure optimal flow of the fuel-air mixture.

The mixture is ignited in the engine cylinder, and the engine is started with the help of the starter. Under the action of the piston, the shaft, which is part of the crank mechanism, begins its movement. There is an asterisk on the shaft, on which the chain links are put on.

The chainsaw uses a single-cylinder engine. A clutch is used as a protection mechanism, which allows the electric motor to idle in the event of a chain jam. At the initial revolutions, special pads located in the radial direction are pressed by springs against the middle of the shaft, thereby preventing it from rotating. At high rpm, the centrifugal force increases, which causes the springs to compress. The pads are squeezed out from the center of the shaft, the sprocket rotates and the chain starts.

The electrical circuit of the device is involved in the ignition system. Due to the use of a flywheel with magnets, an electromotive force (EMF) arises during rotation, which leads to the appearance of a current in the electronics unit. The block sends a signal to the candle, provoking the appearance of a spark at its terminals. This spark ignites the carburetor mixture. After a successful start, the chainsaw begins to repeat all work processes in a cycle.

The chain of the device is assembled from teeth and connecting elements. To protect the user from kickback, the device is equipped with a brake system. Oil is supplied in automatic mode under the action of a pump.

Doesn’t start

If the chainsaw does not start, then the cause may be a breakdown of the ignition and engine start unit. If, when measuring the gap between the module and the flywheel, no deviations are found, then the spark plug should be checked. It is pulled out of the shaft and the gap is measured. If fuel enters the combustion chamber, and there are no breakdowns in the ignition system, then the carburetor is faulty.

How to disassemble, repair and assemble a STIHL chainsaw

In order to repair the device, it must first be disassembled. You need to remove the side cover, saw chain and bar. Then clean the tool, blow it out with a compressor and clean all the components with a brush. Then remove the handle. To do this, remove the plugs from the shock absorbers using a screwdriver. After that, remove the shock absorbers and the handle.

Then the starter is removed. Remove the housing cover and unscrew the starter screws. The part is removed. Then remove the flywheel by unscrewing the nut that holds it, unscrew the flywheel nut. You need to twist to the left. Remove the flywheel. Then dismantle the clutch, oil pump drive and carburetor.

After that, the motor is removed and disassembled. It is held by 4 screws on the bottom of the saw. You need to unscrew them and remove the motor. Then the engine itself is disassembled. Unscrew the crankcase screws, remove it. Then dismantle the crankshaft, oil seals, bearings and piston rings. At the end of the disassembly, repairs and troubleshooting are performed.

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After repair, the tool will need to be reassembled. To do this, install the piston on the connecting rod. The arrow on it should look along the chain, and to the left of the piston will be the side of the crankshaft in which you want to mount the flywheel. They put the piston in the cylinder. Install the bearings, oil seals and circlip into the cylinder. After that, degrease the place of fixing the crankcase and install it in its place. When reassembling, follow the reverse sequence of dismantling.

And also watch the video Dismantling the STIHL MS180 chainsaw

Good evening, I have such a problem. saw STIHL ms180c, worked a little, saw trees last time, there were interruptions in the operation of the engine. Then it stalled. what I didn’t do, 0, disassembled the blew, cleaned, the carburetor, assembled it, started up with a half-turn, worked fine, gained momentum, stalled, and again 0, replaced the spark plug. ignition coil, 0, disassembled carburet, clean, blew, assembled, started. and I worked again, the gasoline ran out, I just poured, poured gasoline, everything is 0 again, the candle is wet, there is a spark, tell me. how to solve this problem, described meticulously, to make it clearer, can anyone come across this problem.

Hello, and when you turned out the candle, did you try it? is there a spark? it happens that there is a spark and everything seems to be in order, but the saw still does not start. I really had the same situation on another brand. it turned out there was no compression. changed the oil seals and it seems to be still (for the second year already) working. there is still a problem. filters. changed them? in general, a bunch, each time different answers, so as not to bother for a long time, try the service, if it is too expensive, then

Types of breakdowns

Before starting work on finding a malfunction of the STIHL 180 chainsaw, it is necessary to prepare the tools and allow the engine to cool down, thus excluding unintentional start.

For a qualitative elimination of a breakdown, it is necessary to analyze what actions preceded its appearance. If we proceed from the fact that the chainsaw is equipped with an electric motor, the main breakdowns are primarily associated with it. The most common malfunctions include:

  • inability to start the engine;
  • self-shutdown of the device during operation;
  • the electric motor does not pick up the required speed during operation;
  • the appearance of extraneous noise and a burning smell;
  • oil leak.

Common breakdowns of chainsaw consumables include chain breakage, which always occurs between its links. When connecting the links to the rivet, you will need to firmly press their side parts and flare them. If the protrusions are worn off, then it will not work to rivet them, therefore contact welding will be needed.

In addition to breaking the chain, it can also stretch. This happens when using a low-quality chain or in case of its frequent overheating, as well as wear of the driven sprocket. Overheating is associated with a disruption in the oil supply caused by blockage of the injection. To eliminate the malfunction, you will need to purge the oil supply system. In the event of stretching, the chainsaw works in jerks. To restore normal operation, you can try to remove one link, while it should be borne in mind that it is not so easy to rivet the links.

When searching for breakdowns in the device, it is recommended to follow the following sequence of actions:

  • examine the general condition of the device;
  • check the mixture level in the fuel tank;
  • inspect the unit responsible for starting the saw;
  • diagnose the performance of the spark plug and the condition of the sealing ring;
  • evaluate carburetor.

Some types of malfunctions can be eliminated by simple actions such as cleaning the components. But malfunctions associated with the carburetor or ignition system require complete or partial disassembly of the saw.

Removing the starter

At the next stage, the upper case cover is removed and the 4 starter mounting screws are loosened, after which it is necessary to remove the oil tank and fuel barrel covers. The starter is removed quite simply and there should be no problems.

After removing the starter, the opened inner cavity of the chainsaw must be cleaned, since usually there is a large amount of compressed small sawdust on the body under the starter.