Engine Tune-Up
6. To be sure of the proper rack adjustment, hold the speed control lever in the full-fuel 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. 3) when the
speed control lever is in the maximum speed position. 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. 4) and when
the pressure of the screw driver is released, the control rack should "spring" back upward.
If the rack does not return to its original position, it is too loose. To correct this condition, back off the outer adjusting
screw slightly and tighten the inner adjusting screw slightly.
The setting is too tight if, when moving the speed control lever from the no-speed to the maximum speed position, the
injector rack becomes tight before the speed control lever reaches the end of its travel (as 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 this condition, back off the inner adjusting screw slightly and tighten the outer adjusting screw slightly.
NOTE: Overtightening of the injector rack control 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 (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.
7. To adjust the remaining injector rack control levers, remove the clevis pin from the fuel rod and the injector control
tube lever, hold the injector control racks in the full-fuel position by means of the lever on the end of the control tube.
Turn down the inner adjusting screw on the injector rack control lever of the adjacent injector until the injector rack has
moved into the full-fuel position and the inner adjusting screw is bottomed on the injector control tube. Turn the outer
adjusting screw down until it bottoms lightly on the injector control tube. Then alternately tighten both the inner and outer
adjusting screws.
8. Recheck the rear injector rack to be sure that it has remained snug on the ball end of the injector rack control lever
while adjusting the adjacent injector. If the rack of the rear injector has become loose, back off, the inner adjusting screw
slightly on the adjacent injector rack control lever. Tighten the outer adjusting screw. When the settings are correct, the
racks of both injectors must be snug on the ball end of their respective rack control levers.
Fig. 5 - Adjusting Maximum No-Load Engine
Speed (Type A)
Fig. 6 - Governor Spring Assemblies
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