Engine Tune-Up
move the output shaft governor lever (on the engine
output shaft speed. This speed could be so low that the
governor cover) and the throttle control lever together
output shaft governor ball head assembly would not
to the maximum speed position and retain there.
actuate the governor pilot valve and spring seat
assembly. In such applications, the engine governor
operating lever, used as an overrule lever, can be
This operation closes the low speed gap
NOTE:
moved toward the idle speed position sufficiently to
(in the engine governor) which may require
provide the desired low output shaft speed. Output
more torque than is available from the torsion
shaft speeds down to zero can be obtained through
s p r i n g between the two l e v e r s . Thus, it is
this type of engine governor control. The engine
important that they be held together, permit-
governor would maintain control unless the output
ting no space between the throttle control lever
shaft speed increased to the speed setting of the output
pin and the arm of the output shaft governor
shaft governor.
lever.
4. To adjust the linkage between the output shaft
governor and the engine governor, loosen the output
Adjustments
shaft governor rod clamping bolt in the ball joint in
The engine governor throttle control lever (Fig. 1) is
the rear cross-shaft lever. Next, move the output shaft
pinned to the throttle shaft. The engine governor
governor rod until there is approximately .020" clear-
operating lever is mounted below the throttle control
a n c e between the stop pin and the output shaft
lever and rides on the throttle shaft boss on the
g o v e r n o r lever. Then tighten the clamping bolt
governor cover. The output shaft governor lever is
securely.
m o u n t e d above the throttle control lever and is
retained on the shaft by a snap ring. A stop pin,
The engine governor control rod is
NOTE:
pressed into the throttle control lever, transmits
connected to the outer bolt hole in the output
movement of the output shaft governor lever and/or
shaft governor lever.
engine governor operating lever through the throttle
control lever to the injector racks. The torsion spring,
5. To adjust the governor operating lever return
used to retain the throttle control lever stop pin
spring, retain the output shaft governor control lever
against the output shaft governor lever, yields to
in the full-fuel position and increase the tension on
permit the governor operating lever to move the
the spring by adjusting the eye bolt and lock nuts until
t h r o t t l e control lever toward the idle position,
the tension of the torsion spring is overcome and the
regardless of the position of the output shaft governor
throttle control lever is moved against the stop in the
control lever. A slot in the underside of the governor
idle position.
cover hub limits the travel of the throttle control lever
in both the maximum and minimum speed positions.
The engine shutdown lever is connected through a
Final Adjustments
shaft to another lever, under the governor cover, which
bears against the pin in the differential lever. To stop
Move the output shaft governor lever in the idle speed
the engine, the shutdown lever is used to move the
position and start the engine.
differential lever to the no-fuel position.
After the engine reaches normal operating tempera-
The following linkage and governor adjustments
ture, advance the output shaft governor speed control
should be made with the engine stopped and after the
lever to the maximum speed position and check the
limiting speed engine governor has been adjusted.
Torqmatic converter output shaft speed. This speed
will vary depending upon engine application.
1. Connect the linkage to the governor operating lever
and check the total travel of the lever. The lever
If it is necessary to adjust the output shaft speed,
should move to the stop bolt in one direction and the
loosen the wing nuts on the sliding link and move the
governor lever return spring should move the lever, in
speed control lever to increase or decrease the speed as
the other direction, until the throttle control lever
needed.
reaches the end of its travel.
The output shaft governor is driven through the
2. Move the governor operating lever to the maximum
converter and there is a high droop. Therefore, the
speed position (against the stop bolt).
no-load speed setting should be at least 150 rpm
h i g h e r than the desired full-load speed setting.
3. Move the output shaft governor control lever to the
Tighten t h e w i n g nuts after c o m p l e t i n g the
full-fuel position and retain it by moving the speed
adjustment.
control lever to the maximum speed position. Then
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