Vehicles with a 64 hp diesel engine (with injection pump BOSCH).
Properly adjusted idle speed is essential for a diesel engine. An engine with incorrectly set speeds runs intermittently at idle or during acceleration. Idling adjustment must be carried out in the following sequence.
1. Carry out a test drive to warm up the engine to operating temperature. After driving, let the engine idle until the radiator fan turns on and off at least two times.
2. Disconnect all consumers of the on-board electrical network (light, air conditioning).
3. Check the idle speed. The nominal value should be 825±25 rpm.
Check of idling and volume of giving of TNVD
The engine must be warmed up to operating temperature.
4. Loosen screw 3, which regulates the amount of fuel injection pump at idle, and unscrew it two turns (see illustration).
4.4 Unlock screw 3, which regulates the volume of fuel supply of the high-pressure fuel pump at idle, and unscrew it two turns
5. Make sure that the adjusting lever 2 fits properly on the screw 3 (see illustration 4.4).
6. Unlock screw 1 and turn it until the engine idle speed is equal to the nominal value of 825±25 rpm. After that, tighten the locknut of the adjusting screw 1 (see illustration 4.4).
7. Insert a gauge or spacer 4 mm thick between screw 3 and adjusting lever 2 (see illustration 4.4).
8. Turn bolt 3 to increase engine speed to 1150±25 rpm (see illustration 4.4). After that, remove the gasket and tighten the locknut of the adjusting screw 3 (see illustration 4.4).
9. Give a few times «Full throttle», and then check the idle speed again. Repeat the adjustment if necessary. If the engine is idling at a lower number of revolutions than required, then loosen the adjusting bolt 3 by 1/4 turn (see illustration 4.4).
If, however, the speed decreases too slowly after «Full throttle», then tighten the adjusting screw 3 by 1/4 turn (see illustration 4.4).
Attention! Mode «Full throttle» do it for no more than five seconds. If the desired idle speed cannot be set, contact the service department.
10. Tighten locknuts of bolts 3 and 1 (see illustration 4.4).
High idle adjustment
Increased idle speed is needed for stable, smooth operation of a cold engine. Increased speed is achieved thanks to a thermocouple installed in the coolant circuit. This thermoelement, when starting a cold engine through a cable pull, activates the corresponding lever on the high-pressure fuel pump.
To carry out the adjustment, the engine must be warmed up to operating temperature. The idle speed must be set correctly.
11. Press the lever 4 all the way to the screw 5, which sets the increased idle speed (see illustration 4.4). Use screw 5 to set the speed to 950±25 rpm. To adjust the speed, loosen the screw locknut, and after adjustment, tighten it.
12. Adjust the gap between the clamp (holder) cable and lever 4 to increase idle speed (see illustration 4.4). To do this, push the lever 4 all the way to the screw 5 and measure the gap. With the cable tensioned, the gap should be 6±1 mm, for vehicles with air conditioning - 2±1 mm, measured between the cable clamp and the lever. If the specified values are not maintained, then loosen the screw on the clamp and move it in one direction or another.
Idle Retarder Adjustment
13. Slightly loosen screws 7 of lever A so that the lever can be moved (see illustration 4.4).
14. Insert between lever A and retarder 6 gauge or gasket 1 mm thick (see illustration 4.4).
15. Press the lever And against the stop with the inserted lining. In this case, the adjusting lever 2 must maintain contact with the screw 3 (see illustration 4.4).
16. Tighten screws 7 (see illustration 4.4).
17. Remove the gasket. Adjustment lever 2 must still be in contact with screw 3 (see illustration 4.4).