How to correctly install the piston on the trimmer for grass

Piston ring installation

the ring and the inner spring were on opposite sides of the piston.

How to correctly mount the piston on the lawnmower

Installing the piston in the engine requires attention and certain technical knowledge. Incorrect installation can lead to engine damage. In the article it is written how to put pistons on the engine of the car VAZ, as their construction is simple and each person can maintain them independently.

How to put the right piston on the lawnmower

To prepare the fuel mixture for the lawnmower, you should first have gasoline of grade not lower than A92, secondly, special synthetic oil for two-stroke engines, and thirdly, a clean container for mixing. Many people simply pour petrol into the tank first, then oil, and shake the mower slightly. As a rule, the required ratio of gasoline and oil is specified in the certificate, but if it is lost, you can mix the components in the proportion 1:40 and you will not make a mistake. That is about 25 grams of oil for every liter of gasoline. That could be the size of a standard oil can. By the way extra little increases the smokiness of the mixture during operation and consequently the soot.

A 2-stroke engine is usually used in chain saws. you need to use the same fuel mix that a 2-stroke engine runs on.

Since the engine has no lubrication system, oil is added to the fuel. If you do not add oil to the fuel, the engine fails very quickly, because the rubbing parts run dry and overheat. The piston, piston rings and cylinder are the first to suffer.

Lately, practically all manufacturers recommend using petrol with at least 92 octane rating with 2-stroke oil in the ratio of 40:1.

If the engine is new or overhauled, you can add a little more oil for the running-in period (25:1). In any case, if you don’t know the manufacturer’s recommendations, it’s better to look at the label on the oil can. If it is a question of changing the proportions, it is better to give more oil. In this case, the risk of engine failure will be minimal.

Usually when you buy a lawn mower comes with an instruction manual, which clearly describes the requirements for fuel. However, the instructions are not always retained. To refuel the lawnmower, in order to prolong its life, it is necessary to add oil to the gasoline. It is usually done in the proportion of 1 to 40, i.e. for 40 liters of petrol you take 1 liter of oil. If you reduce the amount of gasoline to 1 liter, it turns out that you need 25 ml of oil.

Before filling up the mower, this mixture must be mixed well in a separate canister and only then poured into the gas tank.

Get the instruction manual for the lawnmower, usually the booklet with which you bought the lawnmower. It will be sure to tell you what the requirements are for the gasoline. Usually you need to fill up with a ratio of 1:40, although it is possible to use 1:30. So it is 1 part oil and 40 parts gasoline. Oil packs also show the ratio. We buy 92 gasoline, mix it with oil in a separate canister and then fill the lawnmower and the chain saw with it.

The gasoline must have at least a 90 octane rating, as they usually say in the owner’s manual. As for the ratio of oil to gasoline, again, you need to look at the manual. For one saw 1 to 30, for others. 1:40, but for example for chain saw Husqvarna 1:50.

How to Properly Install the Piston on the Benzosaw

Breakdowns can be planned and emergency. Scheduled failure depends on the manufacturer, the materials of manufacture of the group, the intensity of use. Usually a saw’s service life is calculated in engine hours. After working the allotted number of moto-hours the tool should be handed over for the prevention of the engine.

  • is used with higher loads that are not comparable with the power of the tool;
  • lack of proper maintenance, which leads to dry running of the engine and increased wear;
  • Use of poor-quality fuel that does not give the engine stable operation;
  • the long age of the saw, despite the low intensity of use.

every time the tool is started, it puts a certain amount of stress on the piston and cylinder. The service life of your power tool is also affected by the number of starts. If you noticed the extraneous sounds from the motor, a decrease in power, an increase in consumption, it’s time to give the equipment for preventive maintenance in the service center.

How to Properly Install a Piston On a Grass Trimmer

BenzoTools. LIKBEZ

Documents matching your request: 9 [shows 5]

All my attempts to find out what model it is and in what years it was made, were futile (I would be VERY grateful if you could help me in this matter). Nevertheless, I can roughly assume it’s somewhere in the 60’s and 70’s. The chainsaw uses the CONTACT ignition from Bosch.

The number 21554 is stamped on the crankcase. What is this number is a mystery to me.

On the left side of the saw is a plaque that reads.

What information is on it for me. dark forest :-))).

I partially disassembled the chainsaw (to clean it and evaluate the condition of the parts). I also replaced the spark plug tip (it cracked everything) and installed the ignition switch (it was missing when I bought the saw). This information is not known to be original :-))). And one more minus. no oil tank cover. (Everything is marked with arrows in the photo).

There is a chain on the saw. TAKASAGO (I’ve never heard of it, but the inscription on the cutting tooth shows it).

DOLMAR chainsaw. About three or four months ago I had this replica in my hands of a Dolmar chainsaw.

Disassembly. assembling a STIHL MS180 chain saw. Message Satisfaction: 21.43% Message Text Fragments. Disassembly. assembling the STIHL MS180 chain saw. STIHL MS180 chain saw assembly. STIHL MS180 chain saw assembly.

correctly, install, piston, trimmer, grass

Chainsaw or trimmer piston group replacement

Repairs at this level must always be balanced. In these small, high-speed engines, replacing a single burned or stuck piston does not have a lasting effect, and if necessary, the entire piston group must be replaced. So you need to decide whether to continue using this saw or buy a new saw.

If it’s a professional model, this repair should be done, but if it’s an older household model, such as the Husqvarna 40, and it’s been running for more than ten or twelve years, it’s not profitable to repair it. Since it would cost as much to repair as to buy a new saw, albeit not a Husqvarna, but on the PARTNER P350XT CHROME, the cost of 165 is certainly adequate. In addition, Husqvarna sells these saws because PARTNER is its subsidiary.

But if you do decide to repair your chainsaw or grass trimmer, you need original parts, which are not cheap. If the engine is running fine, the first repair may not happen soon, and replace only the piston rings or rings, depending on the model. But if the saw is stuck, you need to change the whole group of pistons. cylinder, piston and rings.

It should be noted that Husqvarna 136/141 chain saws have a life of about 500-600 hours, Husqvarna 340/350. 1000-1200 hours, professional chainsaws at least 2000-2500 hours, provided that you strictly follow the instruction manual. You can’t really rely on these figures, because the actual lifespan can vary significantly, both up and down. But we can roughly say that semi-professional saws work 3-4 times longer than amateur saws, and professional. up to 10 or more times.

Carburetor Repair

If necessary, you can disassemble and thoroughly clean the unit yourself, using gasoline, cleaning the nozzle and ducts using compressed air.

Chainsaw Troubleshooting

Unfortunately, chainsaws, just like other machines, can fail. At least a little understanding of how the saw works, you can eliminate most malfunctions with your own hands. The complexity of the repair is not so much in the work itself, as in the correct determination of the cause of failure.

For example, if the saw won’t start, there may be several possible causes, so you don’t have to disassemble it immediately. First, analyze the causes of failure, which are divided into 2 groups:

  • Malfunctions of nodes of the engine, ignition system, fuel supply or exhaust. This includes malfunctions of the cylinder. piston group.
  • Malfunctions in the lubrication system, chain brake, clutch or tire.

Indicators of engine failure

You can tell if the engine is malfunctioning by the following problems that occur:

  • it is impossible to start the engine;
  • The engine starts but then immediately stops;
  • the engine runs unstable;
  • at idle rpm works in normal mode, but under load loses power or stalls.

All of these malfunctions can indicate a malfunction in the ignition system.

Checking the ignition system

Checking the system is worth starting with an inspection of the spark plug. dry, this indicates no fuel mixture is getting into the cylinder, which means the ignition is not involved. if the spark plug is too full of fuel mixture, the saw was not started correctly or the carburettor is not properly adjusted.


Installing the piston in the lawnmower cylinder

One of the main working elements of a motorcycle engine is a piston. a cylindrical part that moves inside the cylinder. It takes the pressure of the gas created by the combustion of the air-fuel mixture and converts it into mechanical energy.

Pistons used to be made of cast iron. They were reliable, but heavy, so the first engines did not have high power.

Later on, pistons were made of aluminum, a light but very strong material that allowed increasing heat output and engine speed.

However, along with the growth of engine power, the temperature and pressure in the cylinders increased several times, so aluminum parts were replaced by steel ones, capable of withstanding the increased loads. Modern steel pistons have a lightweight design and minimal compression height.

How to repair a chainsaw cylinder block?

To restore, the master completely disassembles the engine and inspects its working parts. Measurements are taken to accurately assess the condition of the equipment and understand what repair procedures need to be performed. In the case of major repairs, parts can be bored if they are made of suitable materials.

There are also other stages in the rebuilding process:

  • evaluation of the efficiency of the piston stroke, measurement of the compression created in the working chamber;
  • inspection of the integrity of the equipment, looking for mechanical damage, scratches
  • Analysis of the condition of the piston fasteners, elimination of backlash and other problems;
  • Check other equipment that affects the operation of the piston group.

To restore the chainsaw cylinder was successful, the master conducts a number of checks after assembling the equipment. It is important that the power corresponded to the factory parameters, and at idle and under load the saw demonstrated stable rpm. Only after these checks can the repair be considered complete.