What to do if the STIHL 180 does not start. A Search for the Reason

The main problem that the STIHL ms 180 chain saw does not start is the lack of spark between the electrodes on the spark plug. You can find the signs of this fault by unscrewing the spark plug and looking around. Having found upon inspection that the spark plug is wet, you need to start searching for the premise of the lack of spark on the spark plug. Sometimes the lack of spark on the spark plug, explained by the wrong gap between the contacts of the ignition module as it is still called the flywheel. You will like it more than simple, also it can be absolutely absent, in this case there will be scratches on the flywheel, which were formed after the contact with the contacts of the coil.

Check and set the gap, without a special tool. you can. For this purpose you will need to remove the starter, loosen the two screws fixing the coil and put a plate cut from a plastic bottle between the contacts of the flywheel and the ignition module, tighten the screws fixing the module.

No spark between the electrodes on the spark plug. that’s the trouble with starting a STIHL chain saw. To identify it, it is necessary to unscrew the plug and inspect it. If the spark plug is wet, you should proceed to further troubleshooting.

Plug location on STIHL 180 chain saw To check if the spark plug is working, it is inserted in the cap of the high-voltage lead and pressed against the engine cylinder. After that, they pull the starter handle several times. It should be remembered that the check of the serviceability of the spark plugs is carried out only with the ignition on.

Undoubtedly, every diligent owner takes care of his equipment. That’s why he always has new spark plugs available. To be sure that the problem lies in a faulty spark plug, you must perform the above operation with a new spark plug. If it is sparking then the spark plug must be replaced with a spark plug in good condition. Otherwise, you should look for a problem in the ignition unit.

Checking the spark plug on a STIHL STIHL 180 chain saw

The gap between the ignition coil and the chainsaw flywheel

It is not possible to look inside the ignition unit. And the reason for this is the non-disassembled construction. At service centers, they check its functionality with a special tool. Troubleshooting at home can be done by replacing the block.

But before you run to the store for a new ignition module for your STIHL chain saw, you must make sure that the problem is not due to an incorrect contact gap between the handwheel and the ignition module. The lack of spark can be caused by too much or too little clearance. In the latter case the handwheel will be in contact with the module contacts and scratches will result.

  • remove the starter
  • Loosen the screws that secure the ignition module;
  • put a plate cut from an ordinary plastic bottle between the module and the flywheel;
  • tighten the screws.

If all of these remedies have resulted in an ignition, your STIHL chain saw is ready to go. Otherwise, you will have to make a second inspection. If the inspection again reveals a lack of clearance, you will have to look for the cause in the crankshaft bearings.

stihl, chain, does, lubricate

Ideally, this is done with the help of a template, which you can choose:

Ideally, the clearance between the electrodes should be around 0.5 mm. Try to fix the fasteners tightly before removing the template, but do not overdo it so as not to inadvertently break the delicate parts located with this assembly.

How to Clean a Plug?

Pay attention to cleaning the spark plugs (an important step in tool maintenance” as well as gap correction). In the case of intensive use of the machine, this procedure is carried out weekly. In another case, twice a year is enough (before winter operation and summer season).

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The candles of the chainsaw Partner, as well as the candles, Champion, parts of other models and brands of tools are ideally cleaned chemically. They are degreased with solvent or acetone and then dried (in summer in the sun, or alternatively on a stove burner). Then the candle is treated with 20% ammonium acetate solution (the liquid is hot). If necessary, it can be ground using a wire brush or a wire brush. Finally, the part is washed and dried.

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Sprocket lubricant

At the end of the chain saw bar there is an idler sprocket that starts the chain. It also needs periodic lubrication. This is done with thick materials. STIHL multi-purpose grease can be used. Domestic lithol-based greases are also good. There is a hole on the bar for greasing the chainwheel. Pump grease into it with a grease gun or syringe.

Take note that frequent use of the bar nose, for example when selecting grooves, increases the load on the sprocket and needs to be lubricated more often.

Manufacturers of adhesive oils

Almost all chainsaw manufacturers also produce consumables for chainsaws, because they believe these products are best suited for use with their saws. There is no information on the correctness of this information, but based on experience in operating and repairing chainsaws, it can be noted that there is no significant difference in the service life of parts or at least visible wear.

But a fact is a fact, the manufacturers recommend it and it cannot be concealed. So let’s go back to the manufacturers, and start with the popular STIHL brand.

STIHL Adhesion Oils

The following adhesion oils are available for different operating temperatures and have a good lubricity index:

  • ForestPlus adhesive oil. recommended for temperatures down to.15 °C, shelf life 3 years if stored correctly. Comes in liter or five-liter containers;
  • BioPlus. its peculiarity is the plant base which allows it to decompose quickly in the soil. It can be used up to minus 15, comes in three, five and one-liter containers;
  • The latest SynthPlus oil is distinguished by its ability to keep its performance at minus 25°C.

Husqvarna oils

The company offers its customers Husqvarna Bio Advanced oil for normal and extreme conditions. The oil is produced from vegetable components and is environmentally safe, available in liter and five-liter containers.

As an economical solution, the company has Vegoil oil; according to the manufacturer, its consumption is reduced by 40% compared to other oils. Comes in a liter container.

The company also makes a bearing oil that it recommends for lubricating the bearings of the drive sprocket and the sprocket on the saw bar.

Less common, but popular with chainsaw owners, are:

  • Polar Lube mineral oil. by Oleo-Mac;
  • Adhesive Champion, sold in containers of up to 10 liters, which is convenient for forestry applications;
  • Makita Biotop;
  • Enkor.

To get acquainted with some chain oils watch the video below, in which a salesman of a large tool chain, Комментарии и мнения владельцев on the use of adhesive oils from different manufacturers.

Troubleshooting chain related problems

Always check chain lubrication while chain saw is in use. This is precisely the part that is subjected to the most severe working conditions. The chain is subject to constant overheating, dust and abrasive particles clog it. All this has a negative effect on its service life. Special grease can remedy the situation. This is fed to the chain from a reservoir, ensuring uninterrupted operation.

stihl, chain, does, lubricate

If there is no lubrication during operation, there is a high probability of overheating. When there is no oil flow, the chain starts to elongate. It can still get stuck or come off by itself, and this can cause serious personal injury.

Channels through which fuel is fed can become clogged with small particles and it is therefore useful to clean them periodically. It is important to keep an eye on the oil level in the tank. Debris in the channel is a frequent cause of the chain brake not working. This can have a negative effect on performance.

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Keeping the channels clean and taking good care of your chainsaw will keep it running for a long time.

But what do you do if you follow the recommendations and oil still leaks. It is necessary to make sure that the chainsaw is working properly. It is likely that it was assembled incorrectly. If the malfunction is not detected, it is recommended to take it to a workshop. In some cases it is necessary to replace the pump, but this should be done if the saw is new. Old tools are leaking because the tank is worn out.

The current state of the chainsaw can only be assessed by an expert. If you have no knowledge or lack of confidence in your own abilities, it is advisable to entrust the repair of the tool to a professional.

Every chainsaw, regardless of model, brand or class has basically the same structure. It consists of several important components, among which is the lubrication system. Without it, the powertrain would not work. Due to the functioning of the forced lubrication system, the tool chain reduces the risk of severe wear, which is guaranteed in conditions of constant friction of the carving element against the guide bar, the inevitable heat. Lubrication softens the friction on the chainring and reduces the need for repair or total replacement of the chainwheel.

We have examined the main causes and faults of STIHL ms 180 chain saws which need to have the cylinder head replaced. But as a rule, in each individual case the causes may overlap, and proper repair requires a comprehensive approach to solving the problem. Putting a new piston saw on the saw does not always solve the problem. It is absolutely necessary to eliminate the causes of failure, and the tool will serve for a long time without problems and without the need for repair.

When to replace the piston

There are many reasons, requires replacement of the piston, but it can also be completely controlled by the piston, but they can all be classified as natural and due to improper use. Of course, it is wear and tear due to prolonged use of the STIHL ms one hundred and eighty chain saw.

The CKD should be diagnosed if the STIHL ms one hundred and eighty suddenly loses power or does not start until the tool’s starter motor is tightened. If the starter motor revs but the saw does not start, there is a spark and the fuel is flowing correctly into the cylinder, you should measure the engine compression.

If you suspect that there is a problem with the processor, it is advisable to contact a service center authorized by the manufacturer, because only there they can accurately diagnose the problem without a complete analysis and, if necessary, carry out a quality repair.

9.5. Eleven atm. It is normal for a STIHL chain saw to regularly start and deliver its maximum power. If compression is lower, the piston/cylinder group is more likely to be hit or worn out. In either case, if compression is low, the dust must be completely disassembled for further diagnosis.

You can remove the muffler and visually inspect the visible part of the piston to determine if there is a piston knob and piston ring failure, and the rings can be checked for elasticity by pressing on them with a small screwdriver. There will not be much movement on the wear rings, piston ring with a defect or pinch will not go.


If oil is being pumped to the chain in excessive quantities, not only while the saw is running but also when idling, manual adjustment should be made (if the pump design allows it). This is done by means of a screw located on the housing near the guide bar, usually at the bottom or side. Tightening the screw reduces the oil flow and loosening the screw reduces the oil flow. If adjustment does not help, you must check the serviceability of the pump, and also inspect the busbar. perhaps in the place of its connection with the housing there is a gap through which the oil flows by the chain.

stihl, chain, does, lubricate

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Lack of oil can be caused by several reasons, each of which has its own solution:

  • Oil pump malfunction. As a rule, it lies in the unserviceable gasket. In order to replace it, it is necessary to carefully disassemble the pump so as not to damage its moving parts. Then a new gasket is installed and the pump is assembled and reinstalled.
  • Oil Entry Hose Failure. If the pump gasket is serviceable, or if replacing it fails, the hose should be checked for leaks. If it is defective, it must be replaced. Otherwise it is not superfluous to clean it and fix it with sealant.

If the cause is not a broken pump, it is necessary to inspect for obstructions all conductive holes and ducts, and if necessary, clean them of foreign objects. This can be done with a jet of compressed air.

You do not want to tinker with your chainsaw but you need to adjust the oil flow? If the chainsaw isn’t working properly and the oil level is low, the chain can be damaged and the chain can be replaced by an authorized service technician. Your saw will be as good as new!

Probable causes of fuel misfeeds

Chain oil may not come to the chain only if there are 2 faults. These include:

The primary cause of the problem is air intake. The reason is that the oil hose leaks while you are using the chain saw. In these circumstances, you need to remove the hose from the hole. Do this at the point where it is connected to the crankcase. Then the hose is sealed and put back in its normal position. If that does not help, it is most likely that the elasticity has been lost. Changing the hose is a good idea for the chainsaw’s future use.

The 2nd cause. breakdown of the oil pump drive

In common parlance, this part is called the worm. When the actuator fails, the oil stops flowing to the chain.The oil pump actuator is a round plastic ring with grooves on the inside. Intense use of the chain saw leads to the wear of internal parts, and as a result the iron hook inside the drive will get pierced. After this failure the oil stops flowing to the chain.

Eliminate problems with chain life

When the chain saw is in use, the chain lubrication has to be monitored continuously. Because it’s a part that operates under some of the harshest conditions. The chain is permanently overheated and clogged with dust and abrasive particles. It has a negative effect on its service life. Special grease can remedy the situation

This grease comes from a reservoir on the chain so it can work flawlessly.

there is no lubrication and the possibility of overheating remains very high. When there is no oil supply, the chain starts to expand. In all this there is still a possibility of its jamming or spontaneous popping off, and as a result a person can be seriously injured.

Channels through which fuel flows can be clogged with small particles, so it is purposeful to clean them occasionally. The principle is to watch the oil level in the tank. Debris in the channel is a frequent cause of the chain brake not working. This can be bad for your operation.

Keeping the channels clean and taking care of your chainsaw will keep it running for a long time.

In addition I’m showing you two photos (because the video was not very well visible).

The red arrow on this picture shows the shoulder.

The second picture shows the correct position of the oil pump (view from below the chainsaw). The red arrow points to the groove (channel) in the pump body, the blue arrow shows how this channel is located. BACK (towards the rear handle of the chainsaw).

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