Diesel engines other than supercharged
Note: With a direct injection diesel engine, the idle speed and the maximum speed do not need to be adjusted, as these parameters are controlled electronically.
Since the diesel engine does not have an ignition system, a special crankshaft speed meter is required to perform the operations (VDO). It can be connected to the W terminal of the generator. If the car has a tachometer, it can also be used.
Warm up the engine to operating temperature. The oil temperature must be at least 60°C. Connect the crankshaft speed meter.
The cold start accelerator must be disabled.
Electricity consumers (radio, light) must be turned off.
Check the idle speed of the crankshaft. The prescribed value for naturally aspirated and supercharged diesel engines is 900±30 1/min. If the specified value is not reached, adjust the engine speed using the adjusting screw (1) to the prescribed value.
When the adjusting screw is turned to the right, the crankshaft speed increases, and when it is turned to the left, it decreases.
Attention: If the idle speed of the engine shaft cannot be adjusted to 930 1/min, since the lever rests against the limit bolt (3), loosen the stop bolt lock nut and unscrew the bolt. Adjust the shaft speed with the adjusting bolt (1), screw the limit bolt into the lever as far as it will go and tighten the lock nut in this position.
Checking the increase in the frequency of rotation of the crankshaft
Pull out the cold start rod by 1 locking groove. Shaft speed should increase by about 60 1/min.
Pull out the cold start cable completely. Shaft speed should increase to 1050±50 1/min.
If the prescribed values are not reached, adjust the cold start rod.
Attention: If the prescribed value of 1050 1/min is not reached despite the correct adjustment of the starting rod, loosen the locknut of the stop bolt (4). With the cold start rod pulled out, adjust the shaft speed with the stop bolt, then tighten the lock nut.
Checking the maximum speed of the crankshaft
Give full throttle. The prescribed value for a diesel engine with a displacement of 1.6 liters is 5100±50 1/min, and for a displacement of 1.9 liters it is 5050±100 1/min. 9 If necessary, loosen the adjusting bolt locknut (2) and adjust the maximum shaft speed. Then tighten the locknut.
Attention: Residual gas adjustment bolt (5) closed with a protective cap and its position usually does not change. If the bolt is accidentally repositioned, the following problems may occur.
1. Bolt is screwed in - the amount of residual gases is too large, the engine idling speed is too high, it is not adjustable.
2. Bolt turned out - the amount of residual gases is too small, jolts when starting off or accelerating from a low shaft speed. If necessary, perform a basic adjustment of the engine, for which remove the safety cap and loosen the locknut of the adjusting bolt (5).
The amount of residual gases is too low: slowly screw in the adjusting screw until the engine speed starts to increase, then back out the screw by 1/2 turn.
The amount of residual gases is too high: Unscrew the adjusting screw until the shaft speed no longer decreases. After that, slowly turn the adjusting bolt back in until the engine speed starts to increase, then turn the bolt back 1/2 turn.
Tighten the locknut of the adjusting bolt and close it with a new safety cap.
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