Replacing the Stihl 361 Oil Pump
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.
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:
- The chain is dry, light in color.
- The chain stretches too fast.
- The tire is too hot and the paint has melted on it.
- The oil does not decrease in the tank.
- 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:
- Breakage of an oil hose. This can be seen during inspection. In this case, the hose must be replaced.
- If there is no thread on the oil pump shaft, replace it.
- If there are defects in the thread, then it must be replaced.
- If there is no corkscrew of the main shaft, then you can install in its place a nail of the same diameter.
- 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:
- Flush or replace the fuel hose.
- Clean the filter.
- Check the quality of gasoline and oil.
- 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.
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.
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.