Replacing the piston on the Husqvarna 137 chainsaw

Replacing the piston group in a chainsaw or trimmer

Repair of this level should always be balanced. In such small engines operating at high speeds, replacing one piston that is burned out or jammed does not give a long result and, if necessary, the entire piston group must be changed. Therefore, you need to consider whether to continue using this saw or purchase a new saw.

If this is a professional model, then such a repair is worth doing, but if it is an old household model like the Husqvarna 40 and it has worked for more than ten or twelve years, it is not profitable to repair it. Because its repair will cost so much. the same as the purchase of a new saw, albeit not from Husqvarna, but for PARTNER P350XT CHROME, the cost of 165 is definitely enough. over, such saws are sold by Husqvarna, since PARTNER is its subsidiary.

But if you nevertheless decide to repair a chainsaw or a trimmer, then you need original spare parts that are not cheap. With proper operation of the engine, the first repair may not come soon and only the piston ring or rings will have to be replaced, depending on the model. But if the saw is jammed, then it is necessary to change the entire piston group. the cylinder, piston and rings.

It should be noted that the Husqvarna 136/141 chainsaws have approximately a resource of 500-600 hours, the Husqvarna 340/350. 1000-1200 operating hours, professional chainsaws at least 2000-2500 operating hours, subject to strict observance of the operating instructions. In fact, it is impossible to rely on these figures, since the real resource can differ significantly, both up and down. But roughly we can say that semi-professional saws work 3-4 times longer than amateur saws, and professional ones up to 10 times or more.

Of course, nothing is eternal, but it’s one thing if you change the piston group, after many years of operation, and after working out its engine hours, it fully paid for itself, but another thing is that this saw was refueled, for example, with gasoline alone, without oil, and it jammed. Such a saw has to be repaired, since all other parts are normal.

Many firms deliberately inflate the cost of spare parts in order to buy new models. For chainsaws and trimmers, for example, from Stihl, spare parts are available in a larger range than on Husqvarna. Therefore, when choosing a certain model, find out how things are with spare parts.
PBT

How does the carburetor work on a Husqvarna 137 chainsaw?

On chainsaws of these models, the Walbro carburetor is most often installed from the factory. Before adjusting the Walbro carburetor on a Husqvarna chainsaw, you must have a minimal understanding of its structure and know how it works.

How to repair a Husqvarna carburetor with your own hands?

During operation and diagnostics, defects in the carburetor may be found. Most of them can be eliminated on their own with a minimum of knowledge and without contacting a specialized repair center.

Among the methods of elimination are:

  • Replacement of various gaskets at the joints of sealed parts;
  • Cleaning or replacing the filter elements of the carburetor;
  • Replacement of pump elements or valves;

Almost all of the above parts can be positioned as a repair kit, which is used for minor repairs of carburetors. After installing them, the carburetor of the Husqvarna 137 chainsaw can forget about malfunctions for a long time, and the regulation will become easier.

What is the factory setting of a husqvarna chainsaw carburetor?

In order for the chainsaw to start anyway, even if the setting is incorrect, the factory positions of the screws H and L are applied. Most Husqvarna chainsaws can be started if both screws are unscrewed exactly one and a half turns. Only then can the position of the screws be changed in order to achieve the desired fuel consumption and maximum efficiency. It is regulated by XX also after these manipulations.

If you still have questions about adjusting the carburetor on the Husqvarna 137 chainsaw and other models of this line, I recommend watching this

READ  How to Adjust the Oil Flow on a Chainsaw

What is responsible for the air supply

Two dampers are responsible for the air supply, installed on the diffuser chamber. The first can regulate the amount of air at the moment the accelerator is pressed and is called the throttle, and the second ensures the restriction of the air supply at the moment when the chainsaw is cold started. To facilitate starting, the flap is closed, which means that the mixture becomes rich, as it is saturated with a large amount of fuel. It is easier to work in this mode, but since it increases fuel consumption, this mode is not applied throughout the entire operation. The saw is worn out.

A non-return valve is used to spray fuel into the cylinders.

The principle of operation is simple: it restricts the return of the mixture back to the chamber. All the main malfunctions of chainsaws, most often, manifest themselves when this mechanism does not work properly.

  • The most common mistake is storing the instrument for too long. The fact is that with prolonged inactivity, the valve sticks and either fills the cylinder with fuel, or simply does not open.
  • The second problem is an increase in the amount of air in the mixture, caused by its suction from the outside when the valve does not work properly. It is no longer possible to regulate here, since in this case only valve repair or its replacement helps, since the saw will not react to the adjusting screws.

Unlike the car, the tuning of the chainsaw carburetor provides for three adjusting screws that are responsible for the quality of the mixture, the amount and nominal speed of the crankshaft of the Husqvarna engine:

  • screw L. designed to adjust the number of revolutions when operating in medium modes and regulates low revolutions;
  • Screw H. adjusts the number of high revolutions and thrust of the installation;
  • T. designed to adjust the total amount of fuel and adjust the operation of the throttle assembly.

It is not recommended to touch the first two screws without special skills. The problem is that if you configure them incorrectly, then the carburetor will not be able to start the engine, or even start it in the wrong operating modes. Such adjustment of the screw can lead to its early wear and failure. This principle is embedded in many devices.

No table lists the settings parameters. Therefore, you should not look for these data in special literature, but only strictly follow the instructions. The table in the passport has only informational value regarding the characteristics of the engine.

When carburetor adjustment is necessary?

The reasons why it will be necessary to adjust this unit can be listed for a very long time.

Among the main malfunctions are the following:

  • Increase in idle speed;
  • The appearance of a large amount of smoke during operation;
  • Deterioration of starting properties;
  • Insufficient tool power when cutting.

This is not a complete list of all known faults. Sometimes a procedure such as adjusting the carburetor on a Husqvarna chainsaw must be carried out after a major overhaul of the power plant or after maintenance.

The developers of the Husqvarna 137 write in the passport that the carburetor adjustment must be carried out before and after running in the tool.

What you should pay attention to?

Once the adjustment of the Husqvarna carburetor is complete, you need to make sure that the engine is stable and the saw easily picks up and drops the required speed. It is considered abnormal to rotate the chain at idle speed, therefore it is necessary to re-adjust its connection with the clutch using the screw H.

Do not forget that the unit is not configured immediately: you need to wait a while, since the Husqvarna chainsaw does not immediately respond to changes in the position of the screws. This time can range from 5 to 15 seconds. This time does not prescribe the table, so you can only find out experimentally.

If, after adjustment, a huge amount of smoke appears during operation, then the supply of the fuel and oil mixture must be adjusted. For these purposes, rotate the screw L.

Husqvarna chainsaw carburetor adjustment

Like all other saws, the husqvarna has the same carburetor adjustment algorithm. Therefore, the instruction will be relevant for other tools and models of chainsaws such as Husqvarna 142.236.

Before starting work, make sure that the air filter is clean and that all other components are working properly. The fuel supply to the float chamber should work without interruptions, and the ignition system is configured correctly and has a fresh spark plug.

  • Set the carburetor to factory settings. This must be done with the engine stopped.
  • Now you can start the engine and be sure to warm it up for a few minutes. The adjustment of the XX carburetor of the Husqvarna 137 is carried out only on a warm engine.
  • Turning screw L clockwise, you need to set the highest speed of the crankshaft, then turn it back a quarter of a turn. Adjust the speed of the crankshaft with the screw T so that the chain does not rotate. It should not be set in motion without pressing the accelerator.
  • Now you need to set the maximum speed and their power. It is enough to connect the tachometer to the ignition system and set the maximum possible speed using the accelerator. Compare them with your passport data. If they differ, then unscrew or tighten the screw H. By changing the range, you can create restrictions to make the saw work efficient and save the motor resource.
READ  Longitudinal Chains For Chainsaws The Difference

Husqvarna 359 Chainsaw Piston and Cylinder Replacement

How to assemble a piston on a chainsaw

Engine malfunctions

  • the engine will not start;
  • starts up, but stalls;
  • works unstable;
  • does not develop power, i.e. works normally at idle, but stalls under load.

When repairing a chainsaw with your own hands, it is necessary to act in a way of exception. inspect alternately all the probable prerequisites for a malfunction, starting with those whose verification and elimination takes the least time (about the design and operation of a two-stroke motor, see here).

Ignition system. Replacing the sprocket on the Husqvarna chainsaw. Almost all types of engine problems listed above can be caused by faults in the ignition system. Therefore, when they occur, it makes sense to start troubleshooting with a candle. This is all the more justified since the state of the latter can provide useful information about the operation of the fuel system. So, if a problem occurs, you need to unscrew the candle and inspect it.

replacing, piston, husqvarna, chainsaw

The wire is disconnected and the candle is unscrewed with a special key.

If the plug is dry, this means that the problem is most likely not in the ignition system, but in the fuel mixture entering the cylinder. You can wrap the spark plug back and start the fuel system. If the spark plug is heavily splashed with a fuel mixture, then there is an excess of it. This can occur from a misalignment of the carburetor or a violation of the starting rules. The candle is wiped and dried, the cylinder is drained by shutting off the fuel supply and working with the starter. to vent the combustion chamber and remove excess fuel. Then put the candle in place and repeat the start.

The presence of a large amount of black carbon also indicates a malfunction in the fuel system.

The ratio between oil and gasoline in the mixture may be disturbed, the carburetor is not adjusted or poor-quality oil is used. The candle is washed in gasoline, cleaned with a needle or an awl from carbon deposits, the electrodes are cleaned with a fine sandpaper and installed in place.

In all these cases, it will not be superfluous to check the gap between the spark plug electrodes. Depending on its brand, it should be in the range of 0.5-0.65 mm. It is also necessary to check the spark plug gasket. If it is worn out or damaged, the tightness of the combustion chamber may not be ensured, which leads to a decrease in compression in the cylinder and problems in engine operation.

Even if, when checking the spark plug, there is good reason to believe that the problem is in the fuel system, you need to check the spark plug for the presence of a spark. If only to be sure that everything is in order with this. Replacing the piston on a chainsaw calm 180: when. For this:

  • put the ignition cable on the spark plug;
  • using pliers with insulated handles, apply the thread or nut of the candle to the cylinder;
  • pull the starter handle and watch. is there a spark or not.

If there is no spark, you just need to replace the spark plug. Replacement of the piston group of the Chinese chainsaw 4500replacement piston group of chainsaw 4500 replacement of the piston group on the stihl ms180 chainsaw cylinder-piston group for the 45mm chainsaw chainsaw china replacement. If the new spark plug does not have a spark either, you need to check the condition of the high-voltage wire for an open circuit and contact with the spark plug.

General disassembly principles

Basically, all chainsaws have the same components, which are dismantled according to a certain scheme. If the assembly of the saw is Chinese, then there is nothing to worry about: most often they are made in the likeness of European models. How to disassemble a chainsaw:

  • The clutch cover is removed.
  • The starter cover is removed. To do this, you need to unscrew the screws and remove the cross handle.
  • To remove the handle, you need to remove the cover that covers the air filter.
  • The petrol hose is removed from the fitting cover.
  • The saw body is dismantled. It is necessary to unscrew the screws and remove the oil tank cover.
  • Before removing the ignition module, you need to disassemble the clutch drum: you need to turn the crankshaft clockwise until the piston closes the gas outlet.
  • Then you need to unscrew the clutch on the chainsaw and remove the clutch: you need to lightly hit it with a hammer.
  • The screws are removed, the gas tank with the oil hose is dismantled.
READ  How to Know the Fuel Consumption of a Chainsaw

BenzoInstrument. LIKBEZ

Blog search (loose match):

Documents satisfying your request: 9 [shown 5]

All my attempts to find out what kind of model it is and in what years it was produced ended. to no avail (I will be VERY grateful for you if you can help me with anything in this matter). But I can roughly imagine that in some places it is the 60-70s of the last century. If you do not change the chainsaw 1. if the piston in the cylinder is not how to dilute the gasoline. The chainsaw uses CONTACT ignition from the BOSCH company.

The number 21554 is stamped on the crankcase. The importance of correctly installing the saw chain on the chainsaw. How to install the chain correctly. What kind of number is this. a mystery to me

There is a nameplate on the left side of the saw.

What kind of information is indicated on it for me as well. the black forest :-))).

I partially disassembled the chainsaw (for cleaning and assessing the condition of the parts). I also replaced the tip of the spark plug (it was all cracked) and installed an ignition switch (it was absent at the time of purchase of the saw). How to correctly install the rings on the piston of a two-stroke scooter published on 25.08 | author: scooter.rv.ua in the installation of rings on the piston of a two-stroke scooter, however, like a four-stroke, there is nothing. These details, as you realize, are not unique :-))). And another drawback is that there is no oil reservoir cover. (Everything is indicated by arrows in the photo).

Carburetor air damper actuator

There is a chain on the saw. TAKASAGO (I’ve never heard of such, but this is evidenced by the inscription on the cutting tooth).

Bus length. 620 mm.

DOLMAR chainsaw. About three or four months ago, this copy of the Dolmar chainsaw was in my hands.

Dismantling. assembling the STIHL MS180 chainsaw. Compliance rate: 21.43%
Fragments of the post text. Dismantling. assembling the STIHL MS180 chainsaw. Dismantling the STIHL MS180 chainsaw. Assembling the STIHL MS180 chainsaw.

Chainsaw PARTNER 352.

Chainsaw piston group

The dimensions of the cylinder-piston group are determined primarily by the diameter of the piston made of heat-resistant aluminum alloy. Regardless of the model, the CPG of the chainsaw consists of a cylinder, a piston, a retaining pin and two retainers.

Husqvarna 137

Chainsaw cylinder mirror

When buying a piston chainsaw, you should pay attention to the inner surface of the cylinder, which must be polished and have a glossy shine. In the presence of damage, scratches, experts do not recommend installing such a cylinder.

In order to increase compression in the working unit and, as a result, increase power, many manufacturers install two piston rings each. Chainsaw compression rings made of special cast iron fit snugly against the cylinder, which ensures the tightness of the combustion chamber.

Engine rebuild on husqvarna 136, 137, 141, 142 chainsaw part 1

On the video you can watch a detailed video instruction, in which the master showed in all details how to properly disassemble the saw and install a new reciprocating saw on it. Also in the video you can see how the saw is cleaned correctly during the repair process.

DIY chainsaw repair

All chainsaw malfunctions can be divided into two main groups: engine problems with all its components and systems (ignition, fuel supply system, cylinder-piston group, exhaust system) and malfunctions of other components (chain brake, lubrication system, clutch, tire, etc.).