Engine Tune-Up
DETROIT DIESEL
Loosen the lock nuts on the eye bolt at the opposite end
of the booster spring.
3. Move the spring retaining bolt in the slot of the
speed control lever until the center of the bolt is on or
slightly over center (toward the idle speed position) of an
imaginary line through the bolt, lever shaft and eye bolt.
Hold the bolt and tighten the lock nut.
4. Start the engine and move the speed control lever
to the maximum speed position and release it. The
speed control lever should return to the idle position. If
it does not, reduce the tension on the booster spring. If
the lever does return to the idle position, continue to
increase the spring tension until the point is reached that
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.
5. Connect the linkage to the governor levers.
Fig. 9 - Adjusting Booster Spring
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