Engine Tune-Up
N O T E : Overtightening of the injector rack
control lever adjusting screws during installa-
tion or adjustment can result in damage to the
injector control tube. The recommended torque
of the adjusting screws is 24-36 in-lb(3-4 Nm).
IMPORTANT: The above step should result in
placing the governor linkage and control tube
assembly in the same position that they will
attain while the engine is running at full load.
8. To be sure of the proper rack adjustment, hold the
speed control lever in the maximum speed position
and press down on the injector rack with a screw
driver or finger tip and note "rotating" movement of
the injector control rack (Fig. 5). Hold the speed
control lever in the maximum speed position and,
using a screw driver, press downward on the injector
control rack. The rack should tilt downward (Fig. 6)
Fig. 5 - Checking Rotating Movement of
Injector Control Rack
and when the pressure of the screw driver is released,
the control rack should "spring" back upward.
6. Move the speed control lever to the maximum speed
If the rack does not return to its original position, it is
position.
too loose. To correct this condition, back off the outer
adjusting screw slightly and tighten the inner adjusting
7. Hold it with light finger pressure (Fig. 4) and adjust
screw slightly.
the No. 4R injector rack by turning the inner
adjusting screw down until a slight movement of the
The setting is too tight if, when moving the speed
control tube is observed or a step-up in effort to turn
the screw driver is noted. This will place the rack in
control lever from the no-speed to the maximum
speed position, the injector rack becomes tight before
the full -fuel position. Turn the outer adjusting screw
the speed control lever reaches the end of its travel (as
until it bottoms lightly on the control tube. Then
tighten both the inner and outer adjusting screw<
determined by the stop under the governor cover).
This will result in a step up in effort required to move
alternately.
the speed control lever to the end of its travel. To
C A U T I O N : Care should be taken to avoid
correct this condition, back off the inner adjusting
setting the rack too tight, causing the fuel rod
screw slightly and tighten the outer adjusting screw
to bend.
slightly.
9. Remove the fuel rod-to- control tube lever clevis pin
from the right front bank fuel rod and install it on the
r i g h t rear bank fuel rod and adjust the No. 5R
injector rack as outlined in Steps 5, 6 and 7.
10. Repeat Step 9 for adjustment of the No. 4L and
5L injector racks. When the settings are correct, the
No. 4R, 5R, 4L and 5L injector racks will be snug on
the ball end of the control levers when the injectors
are in the full-fuel position.
11. With the fuel rod disconnected from the injector
control tube lever, adjust the remaining injector rack
control levers on the right front bank. Hold the
No. 4R injector rack in the full-fuel position by
means of the control tube lever and turn the inner
Fig. 6 - Checking Injector Control Rack
adjusting screw of the No. 3R injector rack control
"Spring"
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