Engine Tune-Up
3. Back out the buffer screw approximately 5/8", if it
and press down on the injector rack with a screw
driver or finger tip and note "rotating" movement of
has not already been done.
the injector control rack (Fig. 4). Hold the speed
control lever in the maximum speed position and,
4. Remove the clevis pin from the fuel rod and the
right cylinder bank injector control tube lever.
using a screw driver, press downward on the injector
control rack. The rack should tilt downward (Fig. 5)
5. Loosen all of the inner and outer injector rack
and when the pressure of the screw driver is released,
control lever adjusting screws on both cylinder heads.
the control rack should "spring" back upward.
Be sure all of the injector rack control levers are free
If the rack does not return to its original position, it is
on the injector control tubes.
too loose. To correct this condition, back off the outer
adjusting screw slightly and tighten the inner adjusting
6. Move the governor speed control lever to the
screw slightly.
maximum speed position; hold it in that position with
a light finger pressure. Turn the inner adjusting screw
The setting is too tight if, when moving the speed
of the No. 1L injector rack control lever down until a
control lever from the no-speed to the maximum
slight movement in the control lever is observed or a
speed position, the injector rack becomes tight before
step-up in effort to turn the screw driver is noted
the speed control lever reaches the end of its travel (as
(refer to Fig. 2 or 3). This will place the No. IL
determined by the stop under the governor cover).
injector rack in the full-fuel position. Turn down the
This will result in a step-up in effort required to move
outer adjusting screw until it bottoms lightly on the
the speed control lever to the end of its travel. To
injector control tube. Then alternately tighten both the
correct this condition, back off the inner adjusting
inner and outer adjusting screws.
screw slightly and tighten the outer adjusting screw
slightly.
NOTE: Overtightening of the injector rack
control lever adjusting screws during installa-
8. Remove the clevis pin from the fuel rod and the
tion or adjustment can result in damage to the
left-bank injector control tube.
injector control tube. The recommended torque
of the adjusting screws is 24-36 in-lbs (3-4
9. Insert the clevis pin in the fuel rod and the right
Nm).
cylinder bank injector control tube lever and position
t h e IR injector rack control lever as previously
IMPORTANT: The above step should result in
outlined in Step 6 for the IL injector rack control
placing the governor linkage and control tube
lever.
assembly in the same position that they will
attain while the engine is running at full load.
10. Insert the clevis pin in the fuel rod and the left
bank injector control tube lever. Repeat the check on
7. To be sure of the proper rack adjustment, hold the
the IL and IR injector rack control levers as outlined
speed control lever in the maximum speed position
in Step 7. Check for and eliminate any deflection
which occurs at the bend in the fuel rod where it
enters the cylinder head.
11. To adjust the remaining injector rack control
levers, remove the clevis pin from the fuel rods and
the injector control tube levers, hold the injector
control racks in the full-fuel position by means of the
lever on the end of the control tube and proceed as
follows:
a . Turn down the inner adjusting screw of the
injector rack control lever until the screw bottoms
(injector control rack in the full-fuel position).
b . Turn down the outer adjusting screw of the
injector rack control lever until it bottoms on the
injector control tube.
c. While still holding the control tube lever in the
Fig. 5 - Checking Injector Control Rack
fuel-fuel position, adjust the inner and outer
"Spring"
adjusting screws to obtain the same condition as
outlined in Step 7. Tighten the screws.
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