- A. Purchase a tachometer for diesel engines.
- b. Entrust the work to a specialist.
- V. Use a strobe light connected to a gasoline engine at the desired idle speed. If you direct the light of such a stroboscope to the mark on the pump pulley on the camshaft (see photo), the label will look stationary when both engines are at the same RPM (or the speed of one engine will differ from the speed of the other by an integer number of times). The pulley rotates at half the speed of the crankshaft, but this will not affect the adjustment (it is impossible to make adjustment on the crankshaft pulley due to an uncomfortable viewing angle).
2. Before starting adjustment, warm up the engine to normal operating temperature.
3. Check if the engine idle speed is correct.
4. If adjustment is required on a Lucas CAV/Roto-Diesel injection pump, loosen the lock nut on the fast idle lever, turn the adjusting screw until the desired idle speed is reached, and tighten the lock nut again (see photo).
5. If adjustment is necessary on the Bosch high-pressure fuel pump manufactured before 1984, loosen the lock nut, turn the stop screw so as to achieve the desired idle speed (see photo), and tighten the locknut again.
6. In the case of the latest Bosch injection pumps, loosen the locknut and turn the minimum speed screw so that it moves away from the feed lever. Loosen the lock nut and turn the quantity screw until the desired idle speed is reached. Tighten locknut again (see D / fig. 3.3).
7. Adjust the minimum speed screw as described in section 10 or 11 (does not apply to early Bosch injection pumps).
8. Turn off the engine and disconnect the test equipment.