Depending on the model, equipment supplier, or other factors, the labeling may differ from that described.
When setting up Oleo-Mac chainsaw carburetors, the following nuances usually arise: After viewing it, no setup questions should arise even for beginners. If necessary, carry out the setting again.įor clarity, the setting of the carburetor of the chainsaw can be seen in the below. After the tuning procedures, the chainsaw is tested in real working conditions.If the internal combustion engine stalls, then the screw is unscrewed clockwise until stable operation is obtained. When the chain is idling, the screw should be turned counterclockwise until it stops. The carburettor is finely tuned with the “S” screw.It is recommended to set 5-10% lower than the maximum speed so as not to provoke increased wear on the engine. When you press the accelerator to the maximum, they monitor the increase in speed, it is important that they do not exceed the maximum allowable value. High engine speeds are adjusted with the “H” screw.If a failure is detected, the screw should be unscrewed until this effect is completely eliminated. Engine without scrolling the chain, and when you click on the accelerator. It is necessary to achieve 1-1.5 thousand rpm. Adjustable operation at low speeds using the screw “L”.
The engine starts, warms up for 3-5 minutes at medium speed.Step-by-step adjustment is performed as follows: There are no similarities with other, less popular models (for example, Oleo-Mac 362 or Oleo-Mac 35) checked, but most likely there are no serious differences. The principle of setting other saws is practically the same, therefore this algorithm is applicable for the following models: 941s, 936. Incremental adjustmentĪn example of carburetor adjustment is described using the Oleo-Mac 937 chainsaw as an example. To control the speed you will need a tachometer. Since the adjustment is performed using external screws, you will need a Phillips or flat-head screwdriver included in the saw set, the width of the working part is 4 mm. To prevent fuel overflow, a special lever and a shut-off valve are provided in the chamber.Ĭarburetor fuel supply system.The operation of the fuel pump is synchronous with the engine: the higher the speed, the stronger the flow of the fuel-air mixture. The fuel supply to the chamber is limited by membranes, the feed rate is determined by the change in pressure in the piston and is controlled through the feedback of the pump and the pulse valve.The amount of gasoline entering the chamber also depends on the settings of the adjusting screws controlling the needle valves (in the diagram, these are spring-loaded screws on the left and right).Inside the carburetor, more combustible mixture is mixed, which, when fed into the combustion chamber, increases the engine speed. When you press the accelerator, the second adjustable throttle opens at a certain angle (this is the second damper in the photo), fuel starts to be supplied through the main jet (position 2 in the diagram).Under pressure, the oil-gas mixture is sprayed through the nozzles (in the diagram above, position 2 is the main nozzle, 3.4 is the idle nozzles), contacts the air, mixes, and then enters the combustion chamber. The fuel pump pumps gasoline into the chamber.Air passes through the filter and bypassing the dampers (in diagram number 1), enters the inside of the housing. When the engine starts, the air damper opens.
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