Engine Tune-Up
Fig. 3 - Governor Gap Adjustment
Fig. 1 - Governor Mounting
to retain the lever positions obtained in Steps 5 and 6
4. Remove the connecting pin from the auxiliary
and install the link.
governor control link lever.
8. Remove gages J 21779 and J 21780 and reinstall
5. Install gage J 21779 so it extends through the lever
the control link lever connecting pins.
and fuel rod and into the gage hole in the bottom of
the housing. With the gage in place, the auxiliary
9. Install the governor housing and auxiliary control
control link lever will be in the mid-travel position.
link housing covers.
6. Remove the connecting pin from the control link
Proceed with the governor and injector rack control
lever in the governor housing and install gage J 21780.
adjustment.
I n s t a l l the gage so the pin extends through the
connecting link, control lever and fuel rod and the
governor housing dowel pin extends into the small
Adjust the Governor Gap
hole in the gage. Then install a governor cover bolt as
shown in Fig. 2 to lock the gage in place. With gage
With the engine stopped and at operating tempera-
J 21780 in place, the governor control link lever will
ture, adjust the governor gap as follows:
be in the mid-travel position and parallel to the
auxiliary control link lever.
1. Remove the governor high-speed spring retainer
cover.
7. Adjust the length of the adjustable connecting link
2. Back out the buffer screw (Fig. 10) until it extends
approximately 5/8" from the lock nut.
3. Start the engine and loosen the idle speed adjusting
screw lock nut and adjust the idle screw (Fig. 9) to
obtain the desired idle speed. Hold the screw and
tighten the lock nut to hold the adjustment.
IMPORTANT: Current governors include a
starting aid screw threaded into the governor
housing.
NOTE: The recommended idle speed is 400-450
rpm, but may vary with special engine
applications.
4. Stop the engine. Clean and remove the governor
cover and lever assembly and the valve rocker covers.
Fig. 2 - Control Link Levers in Position
Discard the gaskets.
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