governor gap and pressing a screw driver against the gap adjusting screw. Movement of the cap toward the plunger will
force the oil from the gap in the form of a small bead.
7.
Hold the gap adjusting screw and tighten the lock nut.
8.
Recheck the gap and readjust if necessary.
9.
Stop the engine and, using a new gasket, install the governor cover.
Position Injector Rack Control Levers
The position of the injector racks must be correctly set in relation to the governor. Their position determines the amount
of fuel injected into each cylinder and ensures equal distribution of the load.
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 or L indicate the injector location in the right or left cylinder bank, viewed from the rear of the engine.
Cylinders are numbered starting at the front of the engine on each cylinder bank. Adjust the No. 3L injector rack control
lever first to establish a guide for adjusting the remaining injector rack control levers.
1.
Disconnect any linkage attached to the speed control lever.
2.
Turn the idle speed adjusting screw until 1/2"of the threads (12-14 threads) project from the lock nut when the nut
is against the high-speed plunger.
CAUTION: A false fuel rack setting may result if the idle speed adjusting screw
is not backed out as noted above.
NOTE: This adjustment lowers the tension of the low-speed spring so it can be
easily compressed. This permits closing the low speed gap without bending the
fuel rods or causing the yield mechanism springs to yield or stretch.
3.
Back out the buffer screw approximately 5/8 ", if it has not already been done.
4.
Remove the clevis pin from the fuel rod and the right cylinder bank injector control tube lever.
5.
Loosen all of the inner and outer injector rack control lever adjusting screws on both injector control tubes. Be sure
all of the injector rack control levers are free on the injector control tubes.
6.
Move the speed control lever to the maximum speed position; hold it in that position with light finger pressure.
Turn the inner adjusting screw on the
Fig. 6. Checking Rotating Movement of
Injector Control Rack
Fig. 5.
Positioning No.
3L
Injector Rack Control Lever
Page 85
DETROIT DIESEL
Engine Tune Up
No. 3L injector rack control lever down as shown in Fig. 3 until a slight movement of the control tube lever is 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 position. Turn down
