How to Disassemble a Stihl 180 For Piston Replacement

Stihl chainsaw is a tool that is designed for harvesting wood, processing plants, creating landscape design and other household needs. If any parts break down or the device fails, you will need to repair the Stihl chainsaw.

How to Disassemble a Stihl 180 For Piston Replacement

Major malfunctions

A chainsaw should be used according to the operating instructions, then it will last a long time and will not fail. All possible malfunctions of the Stihl chainsaw can be identified and eliminated independently. Consider the main problems that may arise in the components and design of the device, and how to repair a Stihl 180 chainsaw with your own hands.

Fills the candle

If you notice that a candle is being poured on a Stihl chainsaw, then possibly a malfunction has occurred in the fuel system. The engine should run on a mixture of gasoline and oil. If the mixture is poor, then a decrease in power occurs, the cylinder overheats and the saw systems wear out. A wet candle on a Stihl chainsaw is due to a disproportion in the fuel mixture. The lack of air in the mixture prevents the proper combustion of the emulsion.

Using low-quality gasoline can cause engine wear.

The oiling of the spark also causes the use of oil for 4-stroke engines, piston wear. If such a malfunction occurs, remove the gas tank cap and adjust the fuel supply. The air intake should be brought in good condition. A clogged filter must be purged with air, but it is better to replace it. How filters can be cleaned is described in the chainsaw instruction manual.

It will be possible to determine the quality of the mixture using a candle insulator. If brown color appeared on it, then this means that the quality of the mixture is normal. White or soot indicates a poor or over-enriched mixture.

The cause of oiling is a candle. Interruptions in the formation of sparks are observed when the gap is set incorrectly. In the instructions for repair and operation of the apparatus, the distance between the contacts of the candle is given. If you do not have such data, then you can set 0.7-1 mm.

If the gap is less, then the efficiency of ignition of the mixture decreases, if more, then interruptions in the formation of a spark occur. To eliminate over-enrichment of the mixture, purge the motor. In this case, you need to remove the candle and turn the crankshaft several times with a manual starter.

The chain is not lubricated

When repairing a chainsaw, you will notice that oil does not get on the chain. If the chain is not lubricated, it means that the lubrication system has interrupted. There are such malfunctions:

  1. The chain is dry, light in color.
  2. The chain stretches too fast.
  3. The tire is too hot and the paint has melted on it.
  4. The oil does not decrease in the tank.
  5. With a sharp chain, the saw began to cut worse.

Such signs indicate that there have been disruptions in the lubrication process. To check the oil supply to the lubrication unit, remove the tire and turn on the chainsaw. Then increase the speed and observe the end point of the oil line. If the oil goes, then its volume is not enough for proper lubrication. If there is no feed, clean the filter. The oil flow should also be adjusted. In the absence of malfunctions, further diagnostics and DIY repair are required. If it turns out that the substance is not supplied, the oil system is repaired.

Consider the main malfunctions and methods for their elimination:

  1. Breakage of an oil hose. This can be seen during inspection. In this case, the hose must be replaced.
  2. If there is no thread on the oil pump shaft, replace it.
  3. If there are defects in the thread, then it must be replaced.
  4. If there is no corkscrew of the main shaft, then you can install in its place a nail of the same diameter.
  5. Filter clogging could occur. With the Stihl MS 180 saw, this happens often. You can rinse it with gasoline. If this does not solve the problem, replace the filter.

The Stihl 180 chainsaw often has an oil line depressurization. This happens where the oil line coming from the tank is inserted into the tool body. Breakage can be detected by smudges of oil at the bottom of the saw.

To fix the problem, remove the handle of the saw, pull out the hose. After that, clean the hose. Then apply sealant to it and put into the tool body.

Does not start

If the chainsaw does not start, then the cause may be a breakdown of the ignition unit and engine start. If there are no deviations when measuring the gap between the module and the flywheel, then check the spark plug. They pull it out of the shaft and measure the gap. If fuel enters the combustion chamber, and there is no breakdown in the ignition system, then the carburetor is faulty.

Does not develop momentum

If the saw does not support idle, then the following may have happened:

  • Clogged filter;
  • Violation of the ignition system;
  • The carburetor has deteriorated;
  • Deformed engine parts.

For self-repair, you need to perform the following actions:

  1. Flush or replace the fuel hose.
  2. Clean the filter.
  3. Check the quality of gasoline and oil.
  4. Check the operation of the carburetor and spark plugs.

When the Stihl chainsaws are repaired, they will work correctly.

If the saw is not gaining momentum, then this could lead to:

  • Faulty engine;
  • Cylinder wear;
  • Failure of piston rings;
  • Breakage of the spark plug;
  • Coil malfunction;
  • Imbalance of carburetor screws.

If after testing no defects are found, then the carburetor is checked.

How to disassemble, repair and assemble a Stihl chainsaw

To repair the device, you must first disassemble it. It is required to remove the side cover, saw chain and tire. Then clean the tool, blow it off with a compressor and clean all the nodes with a brush. Then remove the handle. To do this, remove the plugs from the shock absorbers with a screwdriver. After that, the shock absorbers and the handle are removed.

Then they remove the starter. Remove the housing cover and unscrew the starter screws. Remove the item. Then they remove the flywheel by unscrewing the nut that holds it, unscrew the nut of the flywheel. Twist to the left. Remove the flywheel. Then the clutch, oil pump drive and carburetor are dismantled.

After that, remove and disassemble the motor. It rests on 4 screws on the bottom of the saw. It is necessary to untwist them and take out the motor. Then disassemble the engine itself. Unscrew the crankcase screws, remove it. Then the crankshaft, oil seals, bearings and piston rings are dismantled. At the end of the disassembly, repairs and troubleshooting are performed.

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After repair, the tool will need to be assembled back. 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 the flywheel is to be mounted. Put the piston in the cylinder. Install bearings, oil seals and circlip in the cylinder. Then degrease the crankcase fixation place and install it in its place. During assembly, the reverse dismantling sequence must be observed.

How to remove the clutch

Before unscrewing the clutch, remove the drive sprocket. Remove the lock washer and remove the sprocket and needle bearing. Unscrew the clutch. Remove the reflector plate and pump.

How to remove and replace the sprocket

Replacing the sprocket on a chainsaw is needed in cases where:

  • Jammed chain movement;
  • Wear on the drive sprocket.

To replace, remove the chainsaw sprocket. The teeth of the sprocket should not deviate from the required dimensions, otherwise the work of the saw will be accompanied by vibration, which will lead to damage to the crankshaft and bearings. The sprocket’s life is 2 times the working life of the chain. Use 2-3 chains before abrasion of their cutting surface. After that, change the asterisk. It is located behind the clutch. Remove the clutch assembly cover.

Remove the tire, chain and clutch. But first you need to fix the crankshaft. Then the puller is placed in the hole of the coupling and rotated clockwise. Remove the clutch. Behind it is an asterisk. Now they are dismantling it. If it is faulty, it is replaced.

Repair and replacement of the oil pump

Consider how to change the oil pump. If the element leaks, then the gasket between its two parts should be updated. If this part of the oil pump is not damaged, then it must be wiped and put in place. Now check the hose. There should be no cracks on it. If the hose is damaged, replace it. Then the compressor cleans the output channels.

Piston replacement

Consider how the diagnosis and replacement of the piston group. It is necessary to check the condition of the cylinder and the degree of wear of the piston. After dismantling the motor, the pan is unscrewed, the crankshaft with the piston is removed from the cylinder. Unscrew the stoppers of the piston pin. If the piston is defective, it must be replaced. The retaining rings are fixed with a slit down. Before installing the piston group in the cylinder, the piston is lubricated with oil. Before mounting the crankcase, degrease its surface and apply sealant.

How to set the ignition

It is necessary to set the ignition on the chainsaw. The ignition is adjusted as follows:

  • Turn out the candle and evaluate its appearance;
  • Specify the distance between the magnets and the coil (up to 0.2 mm);
  • Check spark.

Carburetor repair and tuning

The carburetor is adjusted on a warm engine. If the engine cannot be tuned, then the carburetor may become stuck in the mixture with excess gasoline. To remove the part, it is necessary to unscrew the fastening nuts, disconnect the ignition and traction from the engine control lever. Then they remove the lever. Then you can remove the filter and carburetor.

The silencer is fixed with two nuts. You need to untwist them and pull the muffler towards you. Then unscrew the screws of the coil and dismantle it. At the Stihl saw, the carburetor has 1 idle adjustment screw. If the idle speed is violated, then a carburetor repair is needed. This is a complex process, it is difficult to do it yourself. Contact a repair shop.

Starter Cord Replacement

Remove the side cover. Inspect the inside of the protective cover. If there is no damage, check the launch unit. Unscrew the starter bolt and remove the spring. Diagnose a pulley with a cord. If the rope is intact, then each launch of the trigger mechanism is checked:

The starter cord is made of synthetics and gradually wears out. If it is damaged, has cracks or tears, then you need to replace it.

A common type of chain saw is a chainsaw. Such a device is widely used in construction work, the preparation of firewood and other various operations with wood. But no matter how high-quality the device may be, malfunctions can occur in its operation. It is more profitable to repair the Stihl 180 chainsaw yourself, as this will save not only money, but also help to understand its structure.

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 maintaining its movement under the action of centrifugal clutch. In addition to the electric motor, the chainsaw includes:

  • Starter;
  • Flywheel, it is also a cooling unit;
  • Ignition unit;
  • Clutch and brake mechanism;
  • Carburetor with STIHL compensator;
  • Air filter;
  • Fuel and oil tank;
  • Muffler;
  • Anti-vibration system.

Fuel from the tank enters the carburetor, where air is mixed with air from the cleaning unit. From the carburetor, a mixture of air and fuel enters the engine. The saw carburetor has one construction screw that controls the idle speed. All device settings are made at the factory and provide an optimal supply of fuel-air mixture.

In the engine cylinder, the mixture is ignited, and with the help of a starter, the engine starts. Under the action of the piston, the shaft, which is part of the crank mechanism, begins to move. An asterisk is located on the shaft, on which chain links are worn.

The chainsaw uses a single cylinder engine. A clutch is used as a protection mechanism, which allows the motor to idle in the event of a chain jamming. At the initial speed, special pads located in the radial direction are pressed by the springs to the middle of the shaft, thereby preventing it from rotating. At high speeds, the centrifugal force increases, which leads to compression of the springs. The pads are squeezed 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 during rotation, an electromotive force (EMF) occurs, which leads to the appearance of current in the electronics unit. The unit sends a signal to the candle, provoking the appearance of a spark on its terminals. This spark ignites the mixture coming from the carburetor. After a successful start, the chainsaw begins to repeat all the working processes in a cycle.

The circuit of the device is drawn from the teeth and connecting elements. The device is equipped with a brake system to protect the user from a reverse impact. Oil is supplied automatically by the pump.

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Types of damage

Before starting work on troubleshooting a Stihl 180 chainsaw, it is necessary to prepare the tools and allow the engine to cool, eliminating unintentional starting.

To properly repair the breakdown, it is necessary to analyze what actions preceded its occurrence. Based on the fact that the chainsaw is equipped with an electric motor, the main breakdowns are primarily associated with it. The most common failures include:

  • Inability to start the engine;
  • Device self-shutdown during operation;
  • The electric motor does not gain the required speed during operation;
  • The appearance of extraneous noise and the smell of burning;
  • Oil leak.

Common breakdowns of consumables for chainsaws include breaking the chain, which always occurs between its links. When connecting the links to the rivet, you will need to tightly press their side parts and flare. If the protrusions are sharpened, then they cannot be riveted, therefore, contact welding is required.

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

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

  • To study the general condition of the device;
  • Check the level of the mixture in the fuel tank;
  • Inspect the node responsible for starting the saw;
  • Diagnose the performance of the candle and the condition of the o-ring;
  • Rate carb.

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

Dismantling a chainsaw

Before proceeding directly to disassembling the saw, you will first need to clean it. All operations must be performed carefully and without rushing. So that fasteners and small parts are not lost, you can use containers in which structural elements are folded during disassembly.

Disassembly begins by loosening the screws holding the clutch cover, and then loosens the chain tension. Only after this the bolts are completely unscrewed. Then the clutch plate, tire and chain are removed. The next step removes the top case cover. Using a brush and compressed air, the drive gear block is cleaned. Usually the most contaminated area. It is most convenient to wash places in oil smudges with gasoline.

The steps for disassembling a device occur in the following order:

  1. The vibration handle is removed. It is fixed to the saw body on three shock absorbers. To remove, you will need to remove the plugs, after which, using a screwdriver, squeeze the shock absorbers, starting from the farthest located in relation to the handle. Then unscrew the two screws and disassemble the handle. Now you can remove the gas trigger by disconnecting the wire rod.
  2. The starter is removed. After removing the top cover, access to the plugs of the oil and fuel tank will be freed. By removing the plugs, the starter is removed. The installation location of the starter is thoroughly cleaned of sawdust.
  3. The flywheel is released. In order to remove it from the seat, you will need to use a cap-head with a size of 13. Initially, the candle is twisted, the piston is blocked through the hole formed. By loosening the nut, a punch is installed on it, on which a sharp blow is made. From this action, the flywheel jumps off the shaft, after which it is easily removed by hand.
  4. The clutch and the oil pump drive are dismantled. First, the drive sprocket and needle bearing are removed. The lock washer is removed for this. The head with size 19 unscrews the bolts holding the clutch. It is worth noting that the thread on it is left. Having removed the clutch, the reflecting plate and the oil supply drive are removed.
  5. At the penultimate stage, a carburetor with a silencer and an ignition coil are removed. In order to remove the carburetor, you will need an 8 head and extension cord. Before removing the air filter and the carburetor, you will need to disconnect the ignition wire and disconnect the air damper. The muffler is held by two nuts that are easily unscrewed.
  6. The engine is removed. Turning over the saw body, four screws securing the motor are loosened. Then, with a gentle movement, it is removed from the installation site.

The engine itself is easy to understand. First, four screws are loosened and the crater is removed. Next, the crankshaft is removed along with the seals and other elements. Removing the piston from the connecting rod occurs after removing the retaining ring and extruding the piston pin.

Malfunctions and their elimination

Damage caused by the operation of the device occurs for two reasons: violation of the operating conditions and the limited service life of the elements of the chainsaw. As a rule, all repair operations are associated with blockages of certain nodes. The most time-consuming process is engine restoration. Repairing it yourself without a tool and knowledge will be problematic, but fixing the remaining nodes with your own hands should not be difficult.

Carburetor breakdown

Troubleshooting and repair of the carburetor of the Stihl 180 chainsaw can be done by yourself. Violations in the operation of the carburetor are associated with an electric motor. This is manifested in the inability of the saw to gain high speed or to stop it spontaneously.

Most often, this situation occurs due to a stuck valve in the nozzle assembly. To check the nozzle, you will need to remove the carburetor and blow it away from debris. The principle of operation of the valve is based on passing air in only one direction. If it is blown in both directions, it will be necessary to replace it.

Another reason for stopping the chainsaw at increased speeds may be a violation in the air intake. If there is a suspicion of leakage of the suction unit, it is easiest to replace the gaskets. When replacing gaskets, it is worth paying attention to the condition of the needle bearing, the defects of which lead to the fact that the valve does not pass the fuel mixture. A piston with a spring may also be “guilty” in the wrong suction, they are also visually inspected for wear and, if necessary, changed.

Fuel system repair

Characteristic signs indicating a breakdown in the feed system are that fuel is no longer flowing into the cylinder. With such a problem, it is first necessary to check the hose and the condition of the membrane. If everything is in order with these nodes, then the causes are a clogged filter or breather.

If it is suspected that the filter is clogged, the hose is pulled out and the jet of outgoing fuel is visually inspected. If the stream is continuous and under pressure, then everything indicates precisely a filter malfunction. You can try to clean it, but it is more advisable to replace it. The more the manufacturer, with an average load on the device, recommends replacing it every four months. A bad jet of fuel indicates the clogging of the breather. The breather is cleaned with a sharp needle.

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In addition, a clogged air filter is also the culprit. The amount of air mixed with the fuel is not enough, so the fuel mixture becomes too enriched, and engine operation is disrupted. Troubleshooting is carried out by removing the filter and washing it in water.

In case of failures in the fuel supply, it is also worth paying attention to the carburetor channels and the integrity of the membrane.

Ignition System Check

This system will require verification in the first place if the chainsaw ceases to start. You will need to unscrew the candle and examine it. If it is dry, then the fuel does not reach the cylinder. The candle is wiped dry, and then, blocking the fuel supply, the starter starts. This inclusion allows you to dry the combustion chamber and get rid of gasoline residues.

The resulting soot on a candle indicates an incorrect ratio of fuel to oil or their poor quality. Sludge is eliminated by mechanical friction, a knife or needle is used as a tool.

It is imperative to make sure that a spark appears between the terminals of the candle. If there is no spark, then the candle is replaced with a new one. In addition, high-voltage wires are checked for integrity.

It happens that the starter cord breaks. To replace it, you will need to disassemble the starter, gaining access to the drum. It should be noted that the cord must be used original or similar. For example, it is suitable from the Stihl 250 or 361 models.

It should be noted that for reliable operation of the Stihl chainsaw it is necessary to select high-quality fuel. Over, its quantity must comply with the requirements of the manufacturer. If you periodically perform maintenance on the chainsaw, then you won’t have to wonder why it suddenly broke.

The main malfunctions of the Stihl ms 180 chainsaw are related to the piston group. Let us see the main prerequisites for which the piston needs to be changed. Give a description piston and the method of its substitution.

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When to replace a piston

You will like a lot of circumstances for which the piston needs to be changed, in general, and for one hundred percent piston, but our client is left to divide them into natural ones that seemed at the end of the incorrect operation. Natural, this is the wear and tear formed due to the long-term operation of the Stihl 180 chainsaw. Artificial is not easy, for example:

    Motor overheating and the occurrence of thermal scoring;

Diagnostics of the CPG is necessary if the Stihl ms 180 has sharply lost power otherwise it will not start, while the tool starter does not crank. If the passage if the starter is cranking, alas, the saw does not start, with all this there is a spark and fuel enters the cylinder correctly, you need to measure the compression in the engine.

If there is a suspicion of problems with the central processing unit, it is better to contact a service center authorized by the manufacturer, since only there are variations in it without a full analysis to accurately diagnose the malfunction and if it is necessary to carry out high-quality repairs.

9.5. 11 Atm. It is considered a common indicator when the Stihl chainsaw starts up regularly and gives out the highest power, if the compression is lower, there is a possibility that there are bumps on the cylinder-piston group or its wear is quite large. Under any circumstances, with reduced compression, for the upcoming diagnosis, you need to completely disassemble the saw.

You can find the presence of scuffing on the piston, as well as breaking the piston ring, if you remove the muffler and conduct a visual inspection of the visible part of the piston, while there is an option to check the elasticity of the ring by pressing a small screwdriver on them. On the working rings there will be little walking, a defective or pinched piston ring will not go.

Description piston group Stihl chainsaws 180

On a Stihl 180 chainsaw, the piston group has a diameter of 38 mm. The dimension of the CPG chainsaw is determined by the diameter of the piston, the cylinder is a bit complicated. In the complete set, the standard ЦПГ MS 180 is delivered complete with a piston pin, 2 piston rings and 2 retainer rings.

The inner surface of the cylinder must become completely polished and have a glossy shine, where you need to pay attention when buying a spare CPG for a stihl ms chainsaw. If there is damage on the inside of the cylinder, there is no need to install such a cylinder.

Replacing the piston group on a Stihl MS180 chainsaw

In this we will show you how to perform piston replacement chainsaw chains Stihl MS180, crankshaft oil seals.

Hallmark of the CPG on Stihl MS 180 will be that he has two compression rings installed, although in fact all of his 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 operations, enhance its cooling and increase compression in the engine, which improves start-up.

How to change a piston on a Stihl 180 chainsaw

As you need to replace the old piston and install the latest, you should know how to do it correctly and follow a certain method of action. You also need a small slotted screwdriver, a special Stihl combination wrench, a power screwdriver, a hammer, a drift of soft material, a compressor and a stop for the Stihl piston.

Getting started on replacing the piston either piston group assembled, the chainsaw needs to be cleaned of maximum pollution. Further, the work is carried out according to the following method:

  1. The top cover is removed from the saw and the spark plug turns out.
  2. The side cover is removed.
  3. Using a power screwdriver, the stoppers are removed from the shock absorbers of the chainsaw, after which its handle is disconnected from the body.
  4. Next, you need to remove the driven sprocket and starter.
  5. Install the piston stopper in the spark plug hole and loosen the flywheel mounting nut and clutch.
  6. Remove the flywheel, clutch, and oil pump worm gear mechanism located behind the clutch.
  7. Loosen the two screws securing the carburetor and air filter. Remove the filter, engine control lever and Stihl carburetor.
  8. Remove ignition coil and muffler.

When these operations are carried out, it is necessary to further clean the saw from dirt, then turn it upside down and remove the four screws securing the motor to the chainsaw body. Having unscrewed the screws, the engine is separated from the body and cleaned again.

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