The automatic starting device has electric heating in the form of two heating elements, one of which serves for preheating, and the other is turned on only after the cover of the starting device has heated up to a certain temperature. The value of the slightly opened air damper when starting and warming up the engine is determined by the pneumatic drive.
On a cold engine, when you press the accelerator pedal, the air damper closes, and its axis is held by a bimetallic spring of the starting device.
The throttle valve of the 1st chamber is ajar, since the screw, through which its ajar opening is adjusted, rests on the upper profile of the idle sector (at the same time, a special rod prevents the opening of the throttle valve of the 2nd chamber).
The vacuum from the intake manifold reaches the space under the air damper when the engine is started. Under vacuum, fuel is taken through an additional small diffuser of the triple carburetor diffuser. At the same time, the air damper opens slightly. opening the access of air necessary for the formation of a combustible mixture.
While the engine is running at fast idle, to prevent over-enrichment of the combustible mixture, the automatic starting device is connected to the air damper pneumatic actuator. which works at a high vacuum in the space under the air damper. The pneumatic drive rod gradually partially opens the air damper.
After the ignition is switched on, the bimetallic spring heats up and decompresses, providing a gradual opening of the air damper. When the engine warms up, the choke valve opens to the maximum, completely opening air into the carburetor.
The vacuum drops and the diaphragm of the pneumatic actuator of the air damper is released, and under the action of its spring the pneumatic actuator rod returns to its original position.
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