DETROIT DIESEL
Engine Tune-Up
ADJUSTMENT OF MECHANICAL GOVERNOR SHUTDOWN SOLENOID
2. With the stop lever in the run position, adjust the
When a governor shutdown solenoid is used on an
rod end eye or right angle clip for minimum
engine equipped with a mechanical governor, the
engagement on the solenoid plunger when the
governor stop lever must be properly adjusted to
connecting bolt is installed. The oversize hole in the
match the shutdown solenoid plunger travel.
eye or clip will thereby permit the solenoid to start
closing the air gap, with a resultant build-up of pull-in
The solenoid plunger can be properly aligned to the
force prior to initiating stop lever movement.
governor stop lever as follows:
3. The bolt through the rod end eye or the right angle
I.
Remove the bolt connecting the rod end eye
clip should be locked to the stop lever and adjusted to
(variable speed governor), or the right angle clip
a height that will permit the eye or clip to float
(limiting speed governor) to the stop lever (Figs. 6
vertically. The clearance above and below the eye or
and 7). Align and clamp the lever to the shutdown
clip and the bolt head should be approximately
shaft in such a way that, at its mid-travel position, it is
1/32" minimum.
perpendicular to the solenoid plunger. This assures
that the linkage will travel as straight as possible. The
NOTE: The lock nut can be either on top of or
solenoid plunger has available 1/2" travel which is
below the stop lever.
more than adequate to move the injector control racks
from the full-fuel to the complete no-fuel position and
4. Move the lever to the stop position and observe the
plunger for any possible bind. If necessary, loosen the
shutdown will occur prior to attaining complete travel.
Fig. 6 - Typical Variable Speed Governor Lever Position
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