1. Warm up the engine and turn off all electrical consumers of the on-board network.
2. Return the cold start accelerator handle to its original position.
3. Adjust the idle speed with the adjusting screw. When the screw is rotated to the right, the number of revolutions increases, to the left, it decreases (see illustration). The nominal value of the number of revolutions is 900 rpm. A tolerance of 30 rpm is allowed.
With the idle speed set correctly, the movement of the cold start accelerator cable handle should increase the idle speed by 60 rpm. With the cold start accelerator handle fully extended, the idle speed should be 1050 (50 rpm If during the check the data obtained do not match the specified ones, then loosen the lock nut limiting screw for increasing the speed at idle (see illustration 8.3).
4. Pull out the handle of the idling accelerator to the end.
5. Set the speed to 1050 rpm using the stop bolt.
6. Tighten the stop bolt locknut. No action is allowed on the residual gas adjustment screw. If the screw was nevertheless turned by mistake, and this could happen due to the fact that in this place the old types of diesel engines had an idle speed adjustment screw, then engine malfunctions are possible. He can «hang up» at higher idle speeds. This means that the adjusting screw has been screwed in. When the screw is turned out, the engine does not respond well to an increase in fuel supply. If this situation occurs, do the following:
- A) «hangup» engine with the adjusting screw screwed in:
7. Loosen the adjusting screw until the engine starts to make the normal transition to the set speed when the accelerator pedal is released. Check several times.
8. Turn the adjusting screw in half a turn and tighten the locknut.
- b) Engine responds poorly «gas»
9. Screw in the adjusting screw so that the motor «stuck» at high speeds. After that, follow the steps above.
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