Trimmer for grass gasoline how to assemble a piston. Why are the motor details break?

Arrow on the piston of a two.stroke engine where to put a chainsaw

The heart of any chainsaw is an internal combustion engine that sets the working element. a sawing chain. During the operation of a garden tool, there is a need to disassemble the engine. This can be planned maintenance, cleaning from soot and soot, elimination of malfunctions or replacing nodes. If for this you will take the chainsaw to the service center, then you will not have any questions. However, with independent maintenance of a gasoline engine of a garden tool, the question often arises: how to correctly install the pistons back and where the arrow indicates them.

The heart of any chainsaw is an internal combustion engine that sets the working element. a sawing chain. During the operation of a garden tool, there is a need to disassemble the engine. This can be planned maintenance, cleaning from soot and soot, elimination of malfunctions or replacing nodes. If for this you will take the chainsaw to the service center, then you will not have any questions. However, with independent maintenance of a gasoline engine of a garden tool, the question often arises: how to correctly install the pistons back and where the arrow indicates them.

The algorithm for determining the malfunction

The reason for the refusal of the saw or the deterioration of its performance may be:

• a clogged battleship cover;
• Air sucker with a carburetor due to the destruction of the gasket or weakening of threaded fasteners;
• Mechanical sequel of removable saw equipment and other minor defects.

Before starting disassembly, you should verify the need for a more volumetric repair.

Independently assemble a new chainsaw after repair with initial quality, most likely it will not be possible. In the design of modern chainsaws, press plantings of conjugated parts are often used, which have minimal maintainability.

Even a partial analysis of a chainsaw with an improvised tool can lead to undesirable consequences. In most cases, to eliminate a malfunction, you can limit yourself to the dismantling of a separate node or system.

Determination of the causes of the malfunction

If the trimmer engine for grass does not start or stalls immediately after starting, when overheating or during the functioning of the device, extraneous noises are heard and vibration is clearly felt, it is important to perform a visual inspection and identify a non.working node

To optimize preparatory measures before repairing, a simple diagnosis should be carried out and checked in stages:

• the presence of fuel in the tank and lubrication in the main nodes;
• serviceability of the spark plug and its performance;
• the purity of the fuel and air filter motorcycles;
• Cutting of the exhaust channel and the device’s saepun;
• The quality of the used fuel and lubricants.

To determine the functional performance of the ignition of the lawn mower, you should determine whether the candle works by testing the appearance of a spark in contact with the body of the functional device.

The spark plug itself can be changed to a new one, after driving the candle canal, if necessary, the old element is also dried, cleaned with special devices and returned to place.

Asseting device and common malfunctions

The easiest way to give the lawn mower for repairs, allocating a certain amount of funds from the family budget, operational and high.quality repair with your own hands is no less simple and convenient to understand the design of the lawn mower and fix all the problems.

The massive and piece manufacture of trimmers is based on the use of generally accepted technology, the typical design scheme consists of certain elements and parts, it is important to know them when carrying out independent repair work:

• top part. The basis of the entire structure, where all important elements are collected, such as the starter, carburetor and the engine of the lawn mower;
• middle part. Hollow rod, inside it is a cable connecting the engine and gearbox, which sets the cutting fishing line for the trimmer. In this part there are mounts for the distribution of weight of the entire structure and a belt for fixing a trimmer for grass on a belt of a person using a trimmer for grass for its intended purpose;
• Bottom part. It has a gearbox and cutting elements that are hidden under a practical casing, which protects the user. The casing provides an increased level of safety, preventing large fractions of garbage, pebbles and glass in a person while working with a gas station.

The most common and often encountered, subject to independent correction of the breakdown of the unit can be called the following problems:

• engine malfunction, due to which the lawn mower is not started and does not work;
• enhanced vibration of the bar motorcosa, which complicates its targeted use;
• increased overheating of the gearbox, its accelerated heating during operation;
• slow and weak functioning of the cutting fishing line at insufficient speeds;
• the clogging of the starter grill causing the engine overheating and its refusal to work;
• rapid and frequent clogging of the carburetor due to the use of poor.quality fuel;
• clogging of the air filter in case of non.compliance with measures to care for the device.

All these problems can lead to the fact that the device will lose its ability to work before ordering the necessary spare parts for non.bosomeds should be carried out by a visual inspection and diagnosis of the device.

Special attention is required by individual spare parts and assemblies of the device, to verify them, you will not have to turn to a professional master, a complex of diagnostic measures will help to identify a consequence of the occurrence of a loss of performance.

How to change a piston with a 4t scooter?

We will describe the process gradually step by step. First of all, it is necessary to relieve plastic, which prevents us from getting to the engine.

The next step is unscrewed and remove the carburetor (it does not have to disconnect all the hoses from the carburetor, and just take it aside).

We unscrew the silencer at the place of its mount with the cylinder head and at the place of mount with the engine card (2 long bolt). Now we remove the muffler.

The next step is to take the plastic lid of the cylinder head. (2 halves connected by two screws) After that we remove the lid of the cylinder head, unscrewing 4 bolt. Unscrew the chain tension controller, which is located near the carburetor.

Next, unscrew 4 nuts of the cylinder head mount, after which we can remove the cylinder head. When we removed the chain tensioning controller, we released the chain and can easily remove it (after we removed the chain from the camshaft, we must fix it, for example, with a wire so that it does not fall into the engine card)

In this photo, the head has not yet been removed, but only the camshaft is removed and the chain is fixed. The next step remove the cylinder from the hairpins. If problems arise with this, then you can slightly approached the wooden part of the hammer from all sides of the cylinder.

Put the piston in the upper dead point position (the highest position of the piston position, at the same time we focus on the marks on the generator rotor.) It is necessary to ensure that the chain does not fly away from the leading stars, so as not to bother with its installation in the opposite position. Take a clean rag and close the hole of the engine crankcase so that various garbage does not get into it. Remove the locking rings from the piston and thereby free your finger (here you can use the round.liners or small pliers.) Remove your finger with a small wooden bar (we try not to create a load on the crankshaft connector). This is where the process of removing the old CPG is completed.

Obtaining

The pistons can be removed by any tool (even with your hand), and in any case it will fall out as an object taken.

Piston power

Pistons can be frightened by various ways:

• If the red wire is directed directly to the piston, and directly after it it has the shape of a straight braid fishing line. The wire does not curl automatically to the piston.
• If right next to him is a block charged with a red stone (any strength) or a red torch.
• If the charged block is located diagonally above the piston, or two blocks above it. There is no physical contact with the piston, so the piston is “not guessed” that it is charged until it is updated by the neighboring block (quasi.compound phenomenon). On this principle, many block renewal sensors are built.
• Pistons are considered an unbearable (“transparent”) block, therefore it is impossible to transfer energy through them.
• The pistons cannot be charged from their head. However, if the piston is directed up and pushed the charged block there, then it is due to quasi-compound (see. above) it will be charged with them.

Causes of malfunctions of the piston chainsaw

There are many reasons for the failure of the CPG, which are customary to divide into two main categories: natural wear and artificial malfunctions. The first type of malfunctions, as can be seen from the name, belongs to the physical wear of the rubbing parts of the piston group. The second category is more extensive and means:

• strong overheating of the internal combustion engine and, as a result, the appearance of thermal bully on the piston surface;
• bummer of the lower part of the piston (skirt) due to the duration of the chainsaw at maximum speed;
• getting into the combustion chamber of foreign particles and the occurrence of mechanical damage to CPH;
• the bummer of the compression (piston) ring due to severe wear or exceeding the permissible speed of the saw;
• The inconsistency of the recommended portions of gasoline and oil in the preparation of the fuel mixture.

Experts do not recommend disassembling the CPG for no reason. However, if the tool has significantly lost power, a metallic ringing in the internal combustion engine arose or when the starter jerks of the crankshaft does not turn, the piston chainsaw should be diagnosed. First of all, to identify the motor malfunctions, it is necessary to measure the compression in the cylinder. With a significant deviation from the values ​​recommended by the manufacturer, it can be safely argued that there are scratches, production, and darling on the surface of the cylinder or piston. It is the decline in compression that is the basis for the complete disassembly and repair of the piston group of the chainsaw.

For operational diagnosis of CPG for a breakdown of a compression ring of a chainsaw or bully in the cylinder, professionals advise removing the muffler and evaluate their condition through the final window.

Piston chainsaw replacement algorithm

If it is time to replace the CPG of the chainsaws, you need to know that for each specific model there is an individual algorithm of action. To facilitate the disassembly/assembly work, it is necessary to prepare a candle key, a large flat screwdriver, a hammer, a compressor for cleaning the parts of the unit, a set of rock and end keys. Regardless of the manufacturer and the design features of the model before removing the chainsaw cylinder, the following work must be done:

• Dismantling the upper protective cover;
• Spinning candle twisting;
• Removing the side cover;
• With the help of a large flat screwdriver, stoppers from shock absorbers are removed;
• In the candle channel, place the cranberry lamp and unscrew the clutch and nut of the flywheel;
• Dismantling the leading star of the chain;
• We remove the carburetor with an air filter;
• Remove the ignition module and exhaust system.

After removal from the base of the power unit, unscrew the pallet and take out the crankshaft with a piston from the cylinder. Using a locksmith tweezer or screwdriver, dismantle the piston fingers.

Before dismantling the Piston, it is necessary to remember its location in the cylinder in order not to spend time subsequently on re.disassembling and assembly of a power unit.

Sealant for fixing the shaft of the chainsaw

Before starting the assembly, compressed air, rags and other means to clean the parts and assemblies of the unit from dirt, remains of sawdust, dust. The first stage of replacing the piston chainsaw is to install the piston on the crankshaft. We fix it on the connecting rod with a steel finger that is included. In order to prevent the arbitrary loss of locking rings, it is recommended to install them with a cut down. Next, we mount the compression rings on the piston, but due to their fragility and brittleness to this operation, you need to approach as carefully as possible. To prevent the formation of scratches before installing the piston in the cylinder, grease the piston with oil. Before installing the crankcase (pallet), it will be necessary to degrease its mounting surface and apply a layer of heat.resistant sealant. The assembly of the chainsaw is carried out in the reverse algorithm described above.

Often the replacement of the piston of the chainsaw, crankshaft and compression rings solves problems with the idle stroke and with a problematic launch of the internal combustion engine.

Piston chainsaw replacement algorithm

If it is time to replace the CPG of the chainsaws, you need to know that for each specific model there is an individual algorithm of action. To facilitate the disassembly/assembly work, it is necessary to prepare a candle key, a large flat screwdriver, a hammer, a compressor for cleaning the parts of the unit, a set of rock and end keys. Regardless of the manufacturer and the design features of the model before removing the chainsaw cylinder, the following work must be done:

After removal from the base of the power unit, unscrew the pallet and take out the crankshaft with a piston from the cylinder. Using a locksmith tweezer or screwdriver, dismantle the piston fingers.

Sealant for fixing the shaft of the chainsaw

Before starting the assembly, compressed air, rags and other means to clean the parts and assemblies of the unit from dirt, remains of sawdust, dust. The first stage of replacing the piston chainsaw is to install the piston on the crankshaft. We fix it on the connecting rod with a steel finger that is included. In order to prevent the arbitrary loss of locking rings, it is recommended to install them with a cut down. Next, we mount the compression rings on the piston, but due to their fragility and brittleness to this operation, you need to approach as carefully as possible. To prevent the formation of scratches before installing the piston in the cylinder, grease the piston with oil. Before installing the crankcase (pallet), it will be necessary to degrease its mounting surface and apply a layer of heat.resistant sealant. The assembly of the chainsaw is carried out in the reverse algorithm described above.

Often the replacement of the piston of the chainsaw, crankshaft and compression rings solves problems with the idle stroke and with a problematic launch of the internal combustion engine.

During the operation of the scooter, various breakdowns occur

At the same time, it does not matter who the manufacturer (Japan or China). The difference is that one transport earlier fails, and the other over time

Problems can occur with wiring, engine, chassis. But, as a rule, almost everyone faces the replacement of CPG. This reduction implies the term “cylinder-piston-group” or as the people “piston”. Looking ahead, it must be said that the replacement of the piston, piston and rings separately is not such a difficult task as it might seem at first glance. It is also worth knowing that the process of removing and replacing CPH is almost the same on all scooters. Therefore, the article will consider the main points. Looking back in advance, recall that the power of CPH can vary. It is recommended to install a piston of the same power similar to the standard CPG.

How to put a piston on a scooter correctly

The new piston is equipped with a finger, two locking rings and additional rings. If the scooter is 2 stroke, then the number of additional rings-2. In 4 strokes, 3 rings are almost always installed, one of which is oil. Consider the installation of a piston and rings on the example of a 2-stroke scooter. First, two compression rings are put on the piston, in special grooves. Next, the so-called “finger” is connected by the piston and the crankshaft, the fasteners are considered full after the installation of 2 stop rings on both sides of the finger. The rings should “sit” tightly in the intended holes. Remember: the arrow on the piston should look to the bottom, on the floor. The described “processes” are not complicated if you figure it out. It is best to watch a training video or familiarize yourself with the instructions for the maintenance of a scooter. Then probably there will be no questions like “How to put rings on a piston of a scooter”.

Benzo tool. Likbez

Documents corresponding to your request: 9

All my attempts to find out what kind of model it is and in what years it was produced, turned out to be in vain (I will be very grateful if you help me with something in this matter). Nevertheless, I can approximately assume that it is somewhere in the 60-70s of the last century. Bosch uses a chainsaw.

Number 21554 knocked out on a crankcase. What number it is, for me a riddle.

On the left side of the saw there is a sign with the inscription.

What information is indicated for me. dark forest :-))).

I partially dismantled the chainsaw (to clean and evaluate the state of parts). I also replaced the tip of the spark plug (he cracked everything) and installed the ignition switch (it was absent at the time of purchase of the saw). This information, as you know, is not original :-))). And one more minus. The absence of a lid of the oil depot. (In the photo everything was marked with arrows).

There is a chain on the saw. Takasago (I have never heard about it, but this is evidenced by the inscription on the cutting tooth).

Dolmar chainsaw. About three or four months ago I had this copy in my hands Dolmar chainsaw.

Dismantling. Assembly of the chainsaw of the Stihl MS180. Satisfaction of the application: 21.43% Fragments of the text of the message. Dismantling. Assembly of the chainsaw of the Stihl MS180. STIHL MS180 dismantling chainsaws. STIHL MS180 assembly chainsaw.

Replacing the piston group with a chainsaw or trimmer

Repair at this level should always be balanced. In such small, high.speed engines, replacing one burned or stuck piston does not give a long result, and, if necessary, it is necessary to replace the entire piston group. Therefore, you need to decide whether to continue to use this saw or buy a new saw.

If this is a professional model, then such a repair should be carried out, but if it is an old household model, such as Husqvarna 40, and it worked for more than ten or twelve years, it is unprofitable to repair it. Since its repair will cost as much as buying a new saw, albeit not Husqvarna, but on Partner P350XT Chrome, the cost is 165, of course, quite sufficient. In addition, Husqvarna sells such saws, as Partner is her subsidiary.

But if you still decide to repair a chainsaw or a trimmer for grass, then you need original spare parts that are expensive. If the engine works fine, the first repair may not occur soon, and only the piston rings or rings, depending on the model. But if the saw is stuck, you need to change the entire piston group. cylinder, piston and rings.

It should be noted that the chainsaws of Husqvarna 136/141 have a service life of approximately 500-600 hours, Husqvarna 340/350. 1000-1200 hours, professional chainsaws of at least 2000-2500 hours, subject to strict compliance with the instruction manual. In fact, these figures cannot be relyed, since a real resource can vary significantly both up and down. But we can roughly say that semi-professional saws work 3-4 times longer than amateur, and professional. up to 10 or more times.

Why is the stihl chainsaw does not start after replacing the piston

If the saw does not start after replacing the piston, it is necessary to check the supply of fuel into the chamber, as well as diagnose the ignition system. Very often, when installing the control lever on the chainsaw, the masters forget to connect the wires coming from the ignition coil, as a result of which the spark disappears, and the saw does not start.

In addition, the problem can be hidden in a pinched fuel supply hose or if it is not connected at all. Of course, there may be many reasons, but it is worth remembering that if all the work on replacing the piston is performed correctly, the tool should start and work correctly without problems.

Fuel system

So that as the fuel consistency is spent, the fuel tank was filled with air and negative pressure was not created in it, which would not allow the combustible to enter the carburetor, and with all this, so that a fuel does not flow out of the opening for air, in the lid that closes the pouring hole, Brown of a sapun. And by the way, if the saapun clogs with a dirty rod, then the chainsaw will staller.

From the tank, fuel sways through the hose freely dangling in the tank. Husqvarna; Who knows where the gas tank saepun is and how its saepun is in the upper part. Thanks to this, regardless of the position of the chainsaw, the hose is always immersed in fuel. The fuel filter is attached to the inlet end of the hose. A combustible carburetor snut.fuel.

To facilitate launch, part of the chainsaws are equipped with a manual pumping pump. a primer. When starting a chainsaw with a primer, the carburetor is filled with fuel in advance (an excess of fuel flows back into the tank). Thanks to this, the engine triggers, t.to. The stage of filling the carburetor is already passed by fuel, which is made without a primer by a carburetor pump due to the starter.

Installation of rings on the piston of a four.stroke scooter

In any case, you once have to change the piston or rings. Why in any? And therefore, similar Chinese details as consumables must be changed almost every two seasons. If you are the owner of a used four.stroke scooter, then most likely a Chinese piston with rings is also installed in it, at best, Taiwanese.

Why in the used Japanese scooter is no longer a Japanese piston.

This is why, as a rule, after a serious breakdown, which the owner cannot fix it in Japan. It is easier for him to buy a new one than to repair this. And a serious breakdown can be attributed to the decline in compression due to wear of rings and piston. Although in fact this is not such a problem, it can easily be solved.

How to install rings on a piston correctly.

So you decided to replace the piston, or just a piston with rings, or maybe only rings. You bought a kit, but what to do with it you don’t know

It is important to know how to dress rings on a piston of a four.stroke score

Here are 5 pieces, two thin, one oil.splendid and two compression.

There are three grooves on the piston. To the lower, the one that is near the hole where the finger is inserted, three rings should stand, one masl.masteful and two fixing thin.

You can also familiarize yourself with other articles on the topic:

Features of the selection of a piston group

When selecting a new piston or pair of piston-cylinder, be sure to pay attention to the compliance of their markings. Each model of motorcycles exists from two to four dimensional groups of pistons

Their diameter may differ from 0.01 to 0.025 mm.

The labeling of the group is usually applied in the form of a stigma on the bottom of the piston and the lower end of the cylinder. Make sure that these numbers match.

The cylinder must be squealed before installing the piston. If the piston has acute internal corners remaining after machining or due to the marriage of casting, they must be twisted with a file and covered.

To arrange the piston correctly, focus on the arrow knocked out on the bottom of the part. If it is absent or not visible, put the piston in the same way as stop pins: they should “look” at the vertical sectors of the windows without windows.

When selecting a suitable finger, pay attention to its marking. Just like pistons and cylinders, it belongs to one of the several dimensional groups

Usually, a point of a certain color is placed on the end of the finger, the same label is available on the bobes inside the piston.

The piston fingers of the engines of modern motorcycles are usually included in the boss under the influence of slight effort at room temperature. In old models, fingers were pressed after heating in boiling water. In order not to make a mistake, you should familiarize yourself with the instructions for the operation of the vehicle.

Installation of phases of gas distribution of Ch2 (in college-ignition)

Without knocking down the piston with the VMT. we orientate the distribution shaft so that the large hole and risks on its star become shown as shown in the photo and with the simultaneous dressing of the chain set the distribution shaft in the bed.

Ideally, the risks on the asterisk should become strictly parallel to the plane of the valve cover connector. In practice, unfortunately, such accuracy is difficult to achieve. And this is mainly due to the stretching of the timing chain. And there is nothing to be done about it. either change the timing chain to a new one or catch the phase of crossing the teeth, but this method of installing the gas distribution phases for me personally is not acceptable for me.

Where the arrow on the piston of the chainsaw indicates

The heart of any chainsaw is an internal combustion engine that sets the working element. a sawing chain. During the operation of a garden tool, there is a need to disassemble the engine. This can be planned maintenance, cleaning from soot and soot, elimination of malfunctions or replacing nodes. If for this you will take the chainsaw to the service center, then you will not have any questions. However, with independent maintenance of a gasoline engine of a garden tool, the question often arises: how to correctly install the pistons back and where the arrow indicates them.

You need to start with outdoor cleaning the scooter from dirt, sand, dust. The work itself must be carried out in a closed room, where there is no risk of getting inside the garbage outside. The embodiment of open air operations is allowed, but in compliance with the criterion:

• The air temperature should be 18-25 degrees;
• weak or lack of wind;
• the presence of an even hard surface for repair. concrete or asphalt are most ideal;
• It is not recommended to open the insides of the scooter for at least 2 hours after the motor is turned off for security purposes.

For fasteners, you will need to prepare a box with cells for each type, that you can’t lose or confuse the varieties. Work can take about an hour depending on the level of training. In the absence of experience, it is better to call another 1 person to the rescue and closely fix what was extracted (and in what sequence) to collect the vehicle correctly after all.

How to install a piston on a scooter. Installation of rings on the piston of a scooter

Deterioration of traction, falling maximum speed, blue smoke from the muffler and weak dynamics of a scooter-a sure sign of worn piston rings, or worn-out cylinder-piston group. Most often we wear out exactly. t.to. The diameter of the piston group of scooters is small, the working area of ​​the rings is very small and therefore they do not go for so long.

So, if you are faced with the need to replace the piston rings on a scooter, and in addition to the main problem, that they need to be changed, there is another way to put the rings on the piston correctly. You can’t just take any ring and put in any of the “grooves” on the piston. You need to understand which ring is the upper compression, which is the lower compression, as well as how to put an oilfield ring correctly.

Installation of piston rings on a 4-stroke Chinese scooter. In the photo below it is noted where what kind of piston ring.

How did you manage to notice that the set of piston rings consists of two compression rings (upper and lower), as well as the oilfold, which consists of two ordinary (thin) rings and central expander.

The second compression ring has a dark black

color, as well as unique (beveled) geometry.

For different manufacturers, the color of the rings may vary, for example, CMR. the lower compression ring has a redhead

The following scheme shows the correct location of the rings.

On the compression rings you can see the inscriptions, they can be different depending on the company of the rings, but the essence of them is one. installing the rings should be carried out upwards

! T.e. inscriptions should be directed to the cylinder head.

On the oil.welded (two thin) rings of the inscription, as a rule, you can put them with any side, the main thing is that the so.called expander is installed between them, as shown below the photo.

The process of installing the rings on we will lower, t.to. there is nothing complicated there

Only caution should be observed during the establishment of rings in the grooves, t.to. The rings are made of high.strength cast iron and a strong exposure to stretching can lead to breakdown of the rings

If you did everything right, then in the end the rings on the piston should be installed, as shown in the next photo.

On this, all the features of the installation of piston rings on a four.stroke scores are voiced, now you can put the piston in the cylinder, lubricating the rings and cylinder in oil.

Installation of piston rings on a 2-stroke scooter. So, let’s say you purchased a new piston with rings and want to install it on a scooter. Only two compression rings are included with a piston on a two.stroke scooter.

In some cases, depending on the scooter model, there may still be the so.called expander or as it is also called. the expander can be also in the kit. Such an expander is installed for the second (lower) ring.

Before you stand to install the rings on the piston, you need to understand where the upper compression ring is, and where is the lower. T.to. The rings are very different in geometry, the wrong installation of one of the rings will lead to its breakdown

Please note that the upper ring has an internal bevel, before installation, carefully inspect each ring. Below is the installation circuit, which clearly shows where which ring should stand, and also where the expander is installed, if any in the kit is present

How to assemble a piston on a chainsaw

All my samples find out what kind of model it is and in what years they produced it, ended. Inappropriate (I will be very grateful for you if you can help me with anything in this matter). But I can approximately imagine that in some places it is the 60-70s of the past century. Bosch is used by Bosch.

The number was applied on the crankcase. 21554. What is this number. Riddle for me.

On the left side of the saw is a sign with the inscription.

What information is indicated on it and for me. Dark forest :-))).

I partially dismantled the chainsaw (to clean and evaluate the state of parts). I also changed the tip of the spark plug (he cracked everything) and installed the ignition switch (it was absent at the time of purchase of the saw). This information, as you realize, are not unique :-))). And this is another minus. There are oil layers. (In the photo everything is indicated by arrows).

On pollen is a chain. How to launch a chainsaw. The question of how to launch a chainsaw can be divided into two parts: start with the instructions what to do if it does not come out for starting the information from the first part will be useful for them. Takasago (I have never heard of this, but this is evidenced by the inscription on the cutting tooth).