Diesel Engine Troubleshooting

Bosch Injection Pump Adjusting Idle Speed

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The idle adjustment screw location will vary based on the type of governor being used.

Once the engine is started, adjust the idle speed on industrial engines using an RSV governor by loosening the locknut and turning the screw (I), shown in Figure 19-43. CW rotation will increase the idle speed, and CCW rotation will decrease the idle speed. On automotive engines equipped with an RQV governor, refer to Figure 19-44 and using a 10-mm wrench and screw driver, rotate the screw CCW to raise the engine speed and CW to decrease the idle speed.

1. Start and run the engine at its idle speed. Use a tach and note the idle rpm. Compare this with the spec stamped on the engine CPL plate.

2. If idle adjustment is required, loosen the lock nut and back out the bumper spring screw until there is no change in the idle speed.

3. Adjust the idle screw to obtain an idle speed approximately 20 to 30 rpm lower than that recommended and lock the retaining nut.

4. Slowly turn the bumper spring screw (2) shown in Figure 19-43 CW only enough to bring the desired idle rpm to a stable speed, then lock the retaining nut.

Bosch RSV governor Bosch Injection Pump Adjusting Idle Speed

Bosch RSV governor screw location Bosch Injection Pump Adjusting Idle Speed

Written by Ed

September 3rd, 2011 at 8:47 am

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