Engine Tune-Up
DETROIT DIESEL
Fig. 4 - Checking Rotating Movement of
Injector Control Rack
the injector control tube. Then alternately tighten both
the inner and outer adjusting screws.
Fig. 3 - Positioning No. 3L Injector Rack
NOTE: Overtightening the injector rack control.
Control Lever
lever adjusting screws during installation or
adjustment can result in damage to the injector
2. Stop lever in the RUN position.
control tube. The recommended torque of the
adjusting screws is 24-36 in-lb (3-4 Nm).
3. Injector fuel control racks in the full-fuel position.
The above steps should result in placing the governor
The letters R or L indicate the injector location in the
linkage and control tube in the respective positions
right or left cylinder bank, viewed from the rear of the
that they will attain while the engine is running at full
engine. Cylinders are numbered starting at the front
load.
of the engine on each cylinder bank. Adjust the
No. 3L injector rack control lever first to establish a
5. To be sure of proper rack adjustment, hold the stop
guide for adjusting the remaining levers.
1. Remove the clevis pin from the fuel rod and the
right cylinder bank injector control tube lever.
2. Loosen all of the inner and outer injector rack
control lever adjusting screws on both injector control
tubes. Be sure all of the injector rack control levers are
free on the injector control tubes.
3. Move the speed control lever to the maximum speed
position.
4. Move the stop lever to the run position and hold it
in that position with light finger pressure. Turn the
inner adjusting screw of the No. 3L injector rack
control lever down (Fig. 3) until a slight movement of
the control tube is observed, or a step-up in effort to
turn the screw driver is noted. This will place the
No. 3L injector rack in the full-fuel position. Turn the
Fig. 5 - Checking Injector Control Rack
outer adjusting screw down until it bottoms lightly on
"Spring"
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