Engine Tune-Up
Fig. 3 - Positioning No. 1 Injector Rack
Control Lever (One Screw and Lock Nut
Assembly)
Fig. 2 - Positioning No. 1 Injector Rack
Control Lever (Two Screw Assembly)
1. Disconnect any linkage attached to the governor
speed control lever.
Position Injector Rack Control Levers
2. Turn the idle speed adjusting screw until 1/2" of
The position of the injector rack must be correctly set
the threads (12-14 threads) project from the lock nut
in relation to the governor. Their position determines
when the nut is against the high speed plunger.
the amount of fuel injected into each cylinder and
ensures equal distribution of the load.
CAUTION: A false fuel rack setting may result
if the idle speed adjusting screw is not backed
Certain engines use spring-loaded injector control
out as noted above.
tube assemblies which have a yield spring at each
injector rack control lever and only one screw and lock
NOTE: This adjustment lowers the tension on
nut to keep each injector rack properly positioned.
the low speed spring so it can be easily
Adjust the single screw and lock nut on each injector
compressed. This permits closing the low speed
rack control lever the same as for the two screw rack
gap without bending the fuel rods or causing
control lever.
the yield mechanism springs to yield or stretch.
Properly positioned injector rack control levers with
the engine at full load will result in the following:
1. Speed control lever at the maximum speed position.
2. Governor low speed gap closed.
3. High speed spring plunger on the seat in the
governor control housing.
4. Injector fuel control racks in the full-fuel position.
The letters R and L indicate the injector location in
the right or left cylinder bank, viewed from the rear of
the engine. The cylinders are numbered starting at the
front of the engine on each cylinder bank. Adjust the
No. IL injector rack control lever first to establish a
Fig. 4 - Checking Rotating Movement of
guide for adjusting the remaining injector rack control
Injector Control Rack
levers.
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