With all the variety of modern building materials, wood remains very relevant. Therefore, lumberjacks, beautification workers, summer residents are interested in woodworking tools, including chainsaws.
The Stihl chainsaw is easy to operate, inexpensive in price, reliable, has a long service life.
Different people prefer different brands. Someone is interested in the Partner chainsaw, someone. a Stihl brand device, someone. something else. But all of them break at times, and their breakdowns are similar to one another, and differ. Next, consider DIY Stihl chainsaw repair.
This brand is well known both among professionals and among individuals involved in arranging their own living space. The great popularity of the Stihl chainsaw determines the frequent practical use of this tool and makes you look for ways to effectively deal with its typical breakdowns.
Main types and diagnostics of malfunctions, tools for their elimination
Stihl chainsaw design.
Before starting to disassemble the defective mechanism, you should prepare the appropriate tools. Since a chainsaw is a technically relatively simple device, this list is small and includes:
- set of screwdrivers;
- socket wrench set;
- the needle.
In order to carry out a full-fledged high-quality restoration of the working condition of the Stihl chainsaw with your own hands, it is necessary to establish the exact causes of the breakdown. Since this chainsaw refers to mechanisms driven by an internal combustion engine, the main malfunctions are associated with this particular unit.
The most common Stihl chainsaws in operation are the following faults:
- lack of engine start;
- unstable operation of the internal combustion engine immediately after start-up, as a result of which after a short operation the power unit spontaneously shuts down;
- a running engine does not reach full power;
- oil is leaking.
Stihl chainsaw carburetor device
One of the frequent failures of the saw device is also an open circuit. But it does not apply to problems arising from the operation of the motor system. Typically, repairing a torn chain comes down to replacing it with a new one.
The search for the malfunction that led to the failure of the chainsaw is carried out in the following order. First of all, the gasoline level in the tank is checked. If everything is in order with the level, proceed to the inspection of the starting device. If the trigger does not show signs of damage, you must pay attention to the spark plug.
If, as a result of a thorough inspection and verification of the correctness of the gap, it is established that the spark plug is in perfect working order, then the carburetor may be the cause of malfunctions forcing the chainsaw to be repaired. This often happens due to the fact that this device is clogged up.
However, if the old spark plug is replaced with a new one, the carburetor is completely cleaned, and the chainsaw still does not start up or, having earned, dies quickly, then the faulty cylinder-piston group (CPG) may be to blame. In order to qualitatively check the entire group, you will have to spend some time almost completely disassembling the specified system. In this case, the technical condition of the cylinder, piston and piston rings is checked.
And now we consider each malfunction in a little more detail.
Fuel supply system malfunction
As already mentioned, the inspection of a malfunctioning saw tool must begin with the determination of the presence of gasoline in the fuel tank, as well as with the clarification of the technical condition of the breather.
Video: Stihl 260 How To Remove A Carburetor
Stihl chainsaw repair in the event of a malfunction in the fuel supply system.
When checking the fuel level, it is mandatory to open the plug of the gas tank. This must be done even if the tool owner has confidence that there is gas in the tank.
Often, a saw cannot start up due to non-receipt of fuel in the combustion chamber. The reason for this is most often the usual clogging of the breather. a special bypass valve, which serves to equalize the pressure in the tank with a gradual flow of gasoline. In this case, the repair of the chainsaw is reduced to a neat cleaning of the breather with an ordinary sewing needle.
The cause of the failure of the entire tool may be an inoperative starting mechanism or problems in the ignition system. If it turns out that the starting device is operating normally, you need to make sure the spark plug is working. In order to do this, the candle is turned out of the socket and carefully inspected, paying attention to the presence of extraneous plaque on its electrodes.
Chainsaw starter device.
It is worth noting that the presence of traces of a certain property at the place of spark formation very eloquently speaks of the sources of the “disease” of the entire launch system. Such source, in particular, may be a carburetor. So, the complete absence of any signs of fuel on the candle (its complete dryness), most likely, indicates the passage of fuel into the combustion chamber due to the complete clogging of the carburetor.
If gasoline is fixed on the chainsaw candle, and the cutting device itself does not work normally, then this indicates an excess of air-fuel mixture. The reason for this condition is possibly a malfunction in the carburetor adjustments, clogging of its nozzles, as well as improper starting of the mechanism. In the case of fixing a characteristic carbon deposit on a candle, one can speak with sufficient confidence about the improper functioning of the carburetor or about the use of low-quality gasoline.
With all the above signs reflected on the spark plug, it is necessary to remove the carburetor and check its technical condition. If clogging is detected, thoroughly clean the carburetor, then adjust the device according to the technological requirements and replace the gasoline used in the tank. It should always be remembered that the carburetor is a rather complex unit, consisting of many small components, parts and tubules. Therefore, its repair should be carried out with extreme caution and accuracy.
In addition to restoring the carburetor, it is necessary to check on the stand the operability of the spark plug itself and, if necessary, set the correct clearance in it. If the candle and its work do not like at all, it is recommended to replace it with a new candle.
Chainsaw piston group malfunctions
Sometimes the tool engine does not start or runs with obvious interruptions and without reaching the rated and maximum power due to a malfunction of the piston-cylinder group. In this case, do-it-yourself chainsaw repair is done in this sequence.
On the cylinder head, 4 bolts are turned off, after which the cylinder is removed from the block. The piston is carefully checked for chips, scratches, and nicks. Their presence is unacceptable and entails the replacement of the piston. At the same time, there should not be the slightest mechanical damage on the cylinder itself. It can either be repaired with a mirror bore to the repair size of the piston, or replaced with a new assembly with the piston.
Of great importance for ensuring optimal pressure in the combustion chamber is the absence of signs of wear of the piston body and piston rings. The normal functioning of the chainsaw engine largely depends on this.
It is possible to find out the degree of deterioration of parts only after removing the piston group from the motor. The rings themselves should be tight enough and at the same time sit freely on the piston. The presence or absence of wear on the piston and rings can be verified experimentally. To do this, the piston inserted in the cylinder should swing slightly in different directions. Excessive piston travel is likely to indicate wear.
To eliminate this defect, either the cylinder is bored and repair parts are installed, or the entire set of CPGs is changed. Otherwise, the chainsaw will not develop the required power.
Faults in the lubrication system and their elimination
Chainsaw repair is also required if there are problems with the lubrication system. Most often, they consist in the absence of oil supply to the circuit, as evidenced by the apparent dryness of the latter, or in the leakage of oil.
Lubricating fluid is either poorly or completely not supplied to the chain, usually due to clogging or complete clogging of the oil supply channels. In order to identify the places where the oil current is blocked, it is necessary to carefully inspect the oil hose and its connection points. In addition, the oil filter must be cleaned.
If oil leaks, then this indicates a violation of the tightness of the oil channels or hose. Typically, this is due to mechanical damage. Most often, an unusable hose is removed, and a new one is put in its place. But sometimes a less radical method is used, treating the damaged hose with a suitable sealant.
Thus, the Stihl chainsaw repair due to the relative simplicity of its design and the fundamental similarity of its power unit with many other internal combustion engines can be carried out on their own. over, this can be done in ordinary home conditions, without the help of repair technicians.