How to adjust the speed on the chainsaw. Dismantling the carburetor
The reguluvannia of the carburetor of the chainsaw
Chainsaws-the fiction of the champions. The stench won the great popular middle Sadovodvy Tikh, hto.Gazean. Not to do without chainsaws. Shchel more than the valve of the chainsaw in the professor of Lisoruba.
Were it a chainsaw required to be right, serviceman that hungry before the robota. Yakshcho is a lot of navantzhiti iztrument, it is possible to call up to Skorchennya Yogo Ekpraitatskiyny Termin that is bluntly.
Syogodni mi spoke about that part of the mechanism of the chainsaw, the hodannya. The Pidogotovka Paliva in front. The function of the vicone of the carburetor of the chainsaw. The wida nog, the soda, the saber.By.Ribs of the rupture of the rolleries of the rabid. Yakshcho Vachita, Sho Benzinova Lancyugova drank prazuvati with strokes, can, which were a little, TREED.
Features of independent configuration
If there is a certain qualification and appropriate equipment, the owner can rinse and adjust the carburetor, as well as perform simple repairs at home.
The method of trial and error in adjusting work is not acceptable. Over, unqualified interference in the operation of the engine can seriously mean its working characteristics and operational resource.
The task of adjusting the chainsaw carburetor is in proportional, in the ratio of 1:16 supply to the fuel and air engine cylinder. This composition of the gas-air emulsion provides maximum speed and temperature of combustion, maximum traction properties and a supply of a rotational moment.
Properly completed work positively affects the performance, efficiency and durability of the tool in difficult conditions. Timely and correct adjustment of the engine reduces the cost of chainsaws, promotes low.Cost production of its resources.
How the carburetor works on the chainsaw Husqvarna 137?
On the chainsaws of these models, the WALBRO carburetor is most often installed from the plant. Before adjusting the WALBRO carburetor on the Husqvarna chainsaw, you must have a minimum idea of its device and know the principle of operation.
What is responsible for the supply of a mixture of fuel and oil
For accurate supply of fuel with oil, the operation of the fuel pump is used, which is driven mechanically from the crankshaft. The carburetor itself is equipped with a diaphragm and a special needle valve, which are responsible for the regulation of pressure in the system. Thanks to them, there is an organization of the proper operation of the dosing cameras and the pump, which improves the operation of the chainsaw.
Preparation of the fuel mixture
During the operation of the chainsaw, the fuel mixture of gasoline and oil should be used in a ratio of 15: 1 in volume, t. E. To 15 liters of gasoline, add 1 liter of oil and mix the mixture thoroughly. The amount of gasoline and oil in the fuel mixture is given in this table:
ATTENTION! Application of oils: “Lukon-2T; TNK-2T Oil: Azmol Sport 2T GD ”and others., and waste oil in the fuel mixture will lead to the failure of the needle bearing of the connecting rod.
What is responsible for air supply
Two shutters installed on the diffuser chamber are responsible for the supply of air. The first may regulate the amount of air at the time of pressing the accelerator and is called throttle, and the second provides a restriction of air supply at the moment when a cold launch of a chainsaw is made. To facilitate the launch, the damper overlaps, which means that the mixture becomes rich, since it is saturated with a large amount of fuel. It’s easier to work in this mode, but since it increases fuel consumption, this mode is not applied throughout the work. The saw works for wear.
To spray fuel into the cylinders, a nozzle with a check valve is used.
The principle of operation is simple: it limits the return of the mixture back to the camera. All the main malfunctions of the chainsaws are most often manifested when this mechanism is working improperly.
- The most common mistake is the tool for too long. The fact is that with prolonged inaction the valve sticks and, or floods 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 a suction from the outside when the valve is working improperly. It is no longer possible to regulate here, since in this case only the repair of the valve helps or its replacement, since there will be no react to respond to the adjusting screws.
Unlike automobile, setting up the gas.Rospe carburetor provides for three adjusting screws responsible for the quality of the mixture, the number and nominal revolutions of the crankshaft of the Husqvarna engine:
- The screw l is designed to set up the number of revolutions when working in medium modes and regulates low speeds;
- Screw H. Sets up the number of high speeds and the installation traction;
- T. Designed to adjust the total amount of fuel and sets up the work of the throttle node.
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 ensure the launch of the motor, or even even launch it in the wrong operating modes. Such a screw adjustment can lead to its speedy wear and failure. This principle is laid down in many devices.
None of the setting parameters are given. Therefore, do not look for these data in the special literature, but only clearly follow the instructions. The table in the passport has only the information value regarding the characteristics of the engine.
Carburetor setup on a chainsaw
Setting up the chainsaw carburetor, you need to use a tachometer further, that is, in general it works and develops power and it seems to be possible to work. After such settings, you need to cut something. To check the work at high speeds.
Carburetor scheme: 1. Fuel supply fitting; 2. A channel for supplying air pulses on the gas pump membrane; 3. Fuel intake valve; fuel pump (membrane); 5. Fuel release valve from a gasoline pump; 6. Filtering element for the fuel mixture; 7. Air damper, overlapped during the start of the engine; 8. The main throttle flap that regulates the operating mode of the engine and its powerful indicators; 9. Fuel supply channel for mixture; 10. An adjusting screw of the idle speed (OKH); 11. Needle in the fuel supply system; 12. Idle nozzle; 13. Membrane; 14. Fuel accumulation chamber in the carburetor; 15. The main nozzle of the carburetor; 16. Diffuser, the main evaporation of fuel occurs here; 17. A screw for supplying fuel supply through the main nozzle.
What should you pay attention to when working?
First of all, to enrich the mixture, you can see this by exhaust. When we unscrew the screw n or a screw on the clockwise, pay attention to the exhaust system. If in the process of work it starts to go from here with blue smoke, this means the mixture we did too rich. It will lead to a haul on the rings, and to a haul on a candle.
If we have a exhaust with a very strong crack. This is a detonation, a depleted mixture. Too poor the mixture can lead to overheating of the engine and, accordingly, to the burning of the pistons, to wear of the cylinder and burning out the candle.
That is why a tachometer is used to configure minimum idle speed and maximum speed, idle.
Which tachometers to choose
As for tachometers. Then there are Tachometers STIH production, Echo is quite expensive, and very good tachometers. And there are no any extra wires that need to be connected to the apparatus. The tachometer is simply applied to the saw and considers the turning the thing is good, but the road. There are Chinese analogues. Since Pit saw Chinese and tachometer can be purchased by Chinese. The tachometer joins the high.Voltage wire, using the wire from the tachometer, it just wounds on it. We turn on the device and set up.
How to remove a carburetor?
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Husqvarna chainsaw carburetor adjustment
General view of the Husqvarna chainsaw carburetor and adjusting screws:
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A distinctive feature of this saw is the possibility of working at low.Speed idle speeds. In the instructions, the manufacturer notes the following: on a correctly adjusted device, the minimum idle frequency is 600 700 rpm. If the work takes place at a higher speed of the crankshaft, then the chain will not stop in xx mode. This is dangerous for the user.
To properly adjust the carburetor, the chainsaw is put on the horizontal surface.
Before the start of adjustment, you need to give the opportunity to warm up the internal combustion engine for 8 10 minutes (in summer) or 12 15 minutes (in winter, at a negative air temperature).
A screw l clockwise is turned on a carburetor. Having reached the maximum position, they return back about a quarter of turning counterclockwise.
The idle stroke is exposed with a screw indicated by the letter T. Turn this screw clockwise, observe the start of the chain movement. As soon as the chain sets in motion, the screw is turned back to the stopping of the rotation of the drive star. The chain will stop.
Screw n determines the quality of the mixture at maximum speed. If you turn it clockwise to the end, then the ICE will issue a lot of noise. The exhaust will be smoky, the too rich mixture will form in the carburetor. Therefore, from the maximum position, a reverse rotation is carried out for about half a turnover back.
Recommendations for the adjustment of the carburetor at Husqvarna saws shown in the video:
Carburetor adjustment of the Chinese chainsaw
Having mastered the theory and preparing a suitable tool, you can confidently move on to the process. The first instruction is devoted to household and amateur saws with standard types of carburetors that have more widespread, compared to expensive brands. The nuances of adjusting the classic model by 45-52 cubic meters are described here (with a primer and without). To fully convey how to configure the carburetor on the Chinese chainsaw, each movement and task are explained.
To understand, briefly denote each screw and its purpose. L (LOW). Is responsible for low and average speeds. H (Hight). Sets up the momentum at the maximum course when the throttle is completely open. T (TAS. Throttle Adjustment Scred). Regulates the gap with a closed throttle, affecting the elaboration of the idle, when the gas is completely released. Rotation of the screws is performed through special holes located on the left side of the tool.
First of all, the saw must be launched and warmed up, about 1 minute with short.Term cesspools. If the engine refuses to start due to a sipiled carburetor, it should be returned to the factory settings, tightening the screws to the stop (clockwise, without fanaticism) and twisting it into the required position. The standard number of revolutions from the zero point for the carburetor by 45-52 cm³, without a primer, is 2 full turns for the screw l, and 2.25 turns for screw h. With a primer, low values are slightly different: l = 2.25, and h = 2.25 turnover.
For clarity of the position during rotation, well, the handle or the shaft of the screwdriver can be made. You can draw a marker, glue a thin strip of isolets or make a risk with a file.
Carburetor adjustment is performed with the engine operating and starts with the screw l. Turning the screwdriver counterclockwise (from ½ to 1 full.), it is necessary to achieve the maximum speed at idle. The main thing is to observe the measure so as not to accidentally display the screw completely.
Following low speeds, the idle screw (t) is adjusted for the basic position of the throttle. We twist the screw until the chain begins to move, after which we unscrew (approximately 1/2) until the chain stops. So the optimal idle distribution will be achieved.
The final stage of adjustment involves the last screw (h) responsible for high speeds with a complete pressing of gas trigger. To see changes in work, the throttle should be completely open, so you need to clamp the gas at the time of configuration. Just slightly turn the screw clock or against to get the adequate sound of the engine. Without a tachometer, such an operation is performed by ear, achieving a moderate tact (the saw should not roar).
When measuring using a tachometer (on 45 engine), the following values should be achieved: 10,000 revolutions for maximum move and about 3000 for idle. For engines with other volumes, values - minus are similar.
For a more complete and visual presentation of the process, check out the following video, demonstrating how to adjust the carburetor on the Chinese chainsaw. The video contains valuable Комментарии и мнения владельцев of an experienced repair master, and shows the methodology of perfect tachometer. Even if you regulate by ear, you can navigate the sound of the engine from the video.
In this short review, we will not be able to describe in detail all the details of the carburetor and thoroughly familiarize ourselves with all the nuances of his work, but we will dwell only at the main points.
The carburetor consists of such components:
- Air damper tube. A small aerodynamic pipe that is designed to regulate the flow of air. The transverse damper, depending on its position, reduces or increases the amount of air, lunch or enriching the fuel mixture;
- Diffuser. Made in the form of narrowing at the end of the aerodynamic tube. The main task is to increase the pressure and air speed when mixing it with fuel;
- Nozzle, or sprayer. Designed to supply fuel and mix it with oxygen.
- Float chamber. A special reservoir providing a stable level of gasoline at the entrance to the air channel.
How to adjust the carburetor on a chainsaw
Scheme how to adjust the carburetor and recommended position of the settings for setting is indicated in the instructions for each tool. When familiarizing themselves with the new saw, it is recommended to perform the screws to the end, while counting the number of revolutions, so that later it can be returned to factory adjustments.
The main principles of adjustment are as follows:
- Before performing the adjustment, the motor should be heated at idle revolutions in the period of 10 minutes.
- When performing rotational actions in relation to the screw L, you need to configure such the quality of the mixture that at idle for the ICE it functions without failures for 1500–2000 rpm. When pressing a gas lever, a quick and uniform increase in revolutions should occur. If failures occur during the speed of revolutions, this factor indicates an excessively impaired mixture, the screw must be twisted a little, until a stable set of revolutions appears.
- After the configuration of the mixture at low revolutions, the screw t should be tightened to the rotational movements of the chain, and then we unscrew at 1/2 1/3 of the turnover. It is important to ensure that the adhesion mechanism is in good condition.
- You should not adjust the screw N in the field situation. The adverse consequences with the independent setting of the screw N are that a very impoverished mixture at increased speeds, and with increased load, as a result, leads to the accelerated wear of the groups of the group of the group on the saw and the malfunction of the ignition system.
You can set up at increased speeds in the event that three conditions are observed: