14.4.5 Variable Speed Governor
DETROIT DIESEL 53
2. Hold the buffer screw and tighten the lock nut.
Adjust Booster Spring
With the idle speed set. adjust the booster spring as
follows:
1. Refer to Fig. 7 and loosen the booster spring
retaining nut on the speed control lever. Loosen the
lock nuts on the eye bolt at the other end of the spring.
2. Move the spring retaining bolt in the slot of the
speed control lever until the center of the bolt is on an
imaginary line through the center of the bolt, lever shaft
and eye bolt. Hold the bolt and tighten the lock nut.
3. Start the engine and move the speed control lever
Fig. 7 - Adjusting Booster Spring
to the maximum speed position and release it. The
differential lever as lightly as possible and still
speed control lever should return to the idle position If it
eliminates engine roll.
does not, reduce the tension on the booster spring If the
NOTE: Do not raise the engine idle
lever does return to the Idle position, continue to
speed more than 15 rpm with the buffer
increase the spring tension until the point is reached that
screw.
it will not return to idle. Then reduce the tension until it
does return to idle and tighten the lock nut on the eye
bolt. This setting will result in the minimum force
required to operate the speed control lever.
4. Connect the linkage to the governor levers.
1971 General Motors Corp.
Page 4
