Engine Tune-Up
DETROIT DIESEL
No. 3L injector rack control lever down as shown in Fig.
adjusting screw slightly and tighten the inner adjusting
3 until a slight movement of the control tube lever is
screw slightly.
observed or a step-up in effort to turn the screw driver is
noted. This will place the No. 3L injector in the full-fuel
The setting is too tight if, when moving the speed control
position. Turn down the outer adjusting screw until it
lever from the no-speed to the maximum speed
bottoms lightly on the injector control tube. Then
position, the injector rack becomes tight before the
alternately tighten both the inner and outer adjusting
speed control lever reaches the end of its travel (as
screws.
determined by the stop under the governor cover). This
will result in a step-up in effort required to move the
speed control lever to the end of its travel. To correct
NOTE: Overtightening of the injector rack
this condition, back off the inner adjusting screw slightly
control
lever
adjusting
screws
during
and tighten the outer adjusting screw slightly.
installation or adjustment can result in damage
to the injector control tube. The recommended
8.
Remove the clevis pin from the fuel rod and the
torque of the adjusting screws is 24-36 in-lbs
left bank injector control tube lever.
IMPORTANT : The above step should result in
9.
Insert the clevis pin in the fuel rod and the right
placing the governor linkage and control tube
cylinder bank injector control tube lever and position the
assembly in the same position that they will attain
No. 3R injector rack control lever as previously outlined
while the engine is running at full-load.
in Step 6 for the No. 3L injector rack control lever.
7.
To be sure of the proper rack adjustment, hold
10.
Insert the clevis pin in the fuel rod and the left
the speed control lever in the maximum speed position
cylinder bank injector control tube lever. Repeat the
and press down on the injector rack with a screw driver
check on the 3L and 3R injector rack control levers as
or finger tip and note "rotating" movement of the injector
outlined in Step 7. Check for and eliminate any
control rack (Fig. 4) when the speed control lever is in
deflection which may occur at the bend in the fuel rod
the maximum speed position. Hold the speed control
where it enters the cylinder head.
lever in the maximum speed position and, using a screw
driver, press downward on the injector control rack. The
11.
To adjust the remaining injector rack control
rack should tilt downward (Fig. 5) and when the
levers, remove the clevis pin from the fuel rods and the
pressure of the screw driver is released, the control rack
injector control tube levers, hold the injector control
should "spring" back upward.
racks in the full-fuel position by means of the lever on
the end of the control tube, and proceed as follows:
If the rack does not return to its original position, it is too
loose. To correct this condition, back off the outer
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
full-fuel position, adjust the inner and outer
adjusting screws to obtain the same condition as
outlined in Step 7. Tighten the screws.
CAUTION: Once the No. 3L and No. 3R
injector rack control levers are adjusted, do not
try to alter their settings. All adjustments are
made on the remaining control racks.
Fig. 5 - Checking Injector Control Rack
NOTE: Overtightening
of the injector rack
" Spring"
control tube lever_ adjusting screws during
installation or adjustment can result in damage
to the injector control tube. The recommended
torque of the adjusting screws is 24-36 in-lbs.
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