DETROIT DIESEL
Engine Tune-Up
VARIABLE SPEED MECHANICAL GOVERNOR (ENCLOSED LINKAGE) AND INJECTOR RACK CONTROL
ADJUSTMENT
IN-LINE ENGINES
The single-weight variable speed governor is mounted
1.
Disconnect any linkage attached to the governor
on the rear end plate of the engine and is driven by a
gear that extends through the end plate and meshes
with either the camshaft gear or the balance shaft gear,
2.
Back out the buffer screw until it extends
depending upon the engine model.
approximately 5/8" from the lock nut.
After adjusting the exhaust valves and timing the fuel
3.
Clean and remove the governor cover and
injectors, adjust the governor and position the injector
valve rocker cover. Discard the gaskets.
rack control levers.
4.
Place the speed control lever (Fig.
1) in the
maximum speed position.
NOTE: Before proceeding with the governor
and
injector rack adjustments, disconnect
any
5.
Insert a .006" feeler gage between the spring
supplementary governing device.
After
the
plunger and the plunger guide as shown in Fig. 1. If
adjustments are completed, reconnect
and
required, loosen the lock nut and turn the gap adjusting
adjust the supplementary governing device.
screw in or out until a slight drag is noted on the feeler
gage.
Adjust Governor Gap
6.
Hold the adjusting screw and tighten the lock
With the engine stopped and at operating temperature,
nut. Check the gap and readjust if necessary.
adjust the governor gap as follows:
7.
Use a new gasket and install the governor cover
as follows:
a. Place the cover on the governor housing, with
the
Fig. 1 - Checking Governor Gap
Fig. 2 - Positioning the Rear Injector Rack
Control Lever
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