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