Warning: A conventional ignition pulse type tachometer cannot be used on diesel engines.
1. Using a diesel tachometer, measure the maximum engine speed and compare it with the data given in the Specifications.
2. If adjustment is necessary, remove the air cleaner tube. Loosen the lock nut on the idle speed adjusting screw and turn the screw clockwise to increase speed or counterclockwise to decrease speed. Tighten the lock nut without changing the position of the screw (see illustrations). Install the tube.
Bosch VE high pressure fuel pump
3. The Bosch VE fuel pump requires a modified idle speed adjustment procedure. The later pump can be identified by the vertical idle speed adjustment screw located on the face of the pump. Where this type of pump is installed, it is necessary that the engine speed control lever locking screw not be disturbed. The positions of the adjusting screws are shown (see illustration).
4. To adjust the speed, loosen the lock nut on the idle speed adjusting screw and turn the screw as necessary to achieve the speed specified in the Specifications. Tighten the lock nut without changing the position of the screw.
Lucas/CAV Fuel Pump
5. The idle speed on engines equipped with a Lucas/CAV pump can be adjusted with the appropriate adjusting screw (see illustration). The engine speed control lever lock screw must not be disturbed.
(Article published on the website: opelbook)
6. To adjust the idle speed, loosen the lock nut on the idle speed adjusting screw and turn the screw as necessary to achieve the desired speed (see Specifications). Tighten the lock nut without changing the position of the screw.
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