DETROIT DIESEL
Engine Tune-Up
VARIABLE SPEED MECHANICAL GOVERNOR (OPEN LINKAGE) AND INJECTOR RACK CONTROL ADJUSTMENT
IN-LINE ENGINES
After adjusting the exhaust valves and timing the fuel
3.
Back out the booster spring eye bolt until it is
injectors, adjust the governor (Fig. 1) and the injector
flush with the outer lock nut.
rack control levers.
Adjust Variable Speed Spring Tension
Preliminary Governor Adjustments
1.
Adjust the variable speed spring eye bolt until
1.
Clean the governor linkage and lubricate the
1/8"of the threads project from the outer lock nut (Fig.
ball joints and bearing surfaces with clean engine oil.
2).
2.
Back out the buffer screw until it projects 9/16"
2.
Tighten both lock nuts to retain the adjustment.
from the boss on the control housing.
NOTE: This setting of the eye bolt will produce
approximately 7% droop in engine speed from
no-load to full-load.
Position Injector Rack Control Levers
The position of the injector control racks must be
correctly set in relation to the governor. Their position
Fig. 1 - Variable Speed Open Linkage Governor
Mounted on Engine
Fig. 2 - Adjusting Governor Spring Eye Bolt
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