Engine Tune-Up
DETROIT DIESEL
HYDRAULIC GOVERNOR AND INJECTOR RACK CONTROL ADJUSTMENT
IN-LINE ENGINE
The hydraulic governor is mounted on the 3 and 4-53
NOTE: Overtightening the injector rack
engines as shown in Fig. 1. The terminal lever return
control lever adjusting screws during
spring and the fuel rod are attached to an external
installation or adjustment can result in
terminal shaft lever. The maximum fuel position of the
damage to the injector control tube. The
governor load limit is determined by the internal
recommended torque of the adjusting
governor terminal lever striking against a boss that
screws is 24-36 in-lbs
projects from the governor cover.
2. Remove the governor terminal lever return spring.
Adjust engines having a hydraulic governor assembly
after adjusting the exhaust valve clearance and timing
3. Remove the fuel rod end bearing or ball joint from
the fuel injectors.
the terminal shaft lever and the terminal lever from the
terminal shaft.
Adjust Fuel Rod and Injector Rack Control Levers
4. Place the terminal lever on the terminal shaft so that
1. Adjust the inner and outer adjusting screws (Fig. 2)
the hole for attaching the fuel rod end bearing or ball
on the' rear injector rack control lever until both screws
joint is in line vertically above the terminal lever shaft at
are equal in height and tight on the control tube. Check
one half the arc of travel. Do not tighten the clamping
the clearance between the fuel rod and the cylinder
bolt.
head casting (below the bolt) for at least 1/16" clearance
when the injector rack is in the fullfuel position and the
5. Hold the injector rack control tube and the terminal
rack adjusting screws are tight. If the fuel rod contacts
lever in the full-fuel position and adjust the length of the
the bolt or cylinder head casting, readjust the screws to
fuel rod until the end bearing or ball joint will slide freely
obtain the 1/16" clearance.
into the hole of the terminal lever as shown in Fig. 3.
Tighten the lock nut to retain the ball
Fig. 1 Hydraulic Governor Mounted on Engine
Fig. 2 - Adjusting Height of Rack Control Lever
Adjusting Screws
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