14.3.1 Limiting Speed Governor
DETROIT DIESEL 53
increased more than 25 rpm from the maximum speed
attained in Step 1, back off the buffer screw until the
increase is less than 25 rpm.
3. Hold the buffer screw and tighten the lock nut.
Fig. 5 - Adjusting Engine Idle Speed
temperature, loosen the lock nut and turn the buffer
screw in (Fig. 6) so that it contacts the differential
lever as Iightly as possible and still eliminates engine
NOTE: Do not increase the engine idle speed
more than 15 rpm with the buffer screw.
2. Recheck the maximum no-load speed. If it has
Fig. 6 Adjusting the Buffer Screw