Over speed Governor
Lubricate the over speed governor, if it is equipped with a hinge-type cap oiler or oil cup, with 5 or 6 drops of
engine oil every 500 hours or 15,000 miles. Avoid excessive lubrication and do not lubricate the governor while
the engine is running.
Item 23 Fuel Injectors and Valve Clearance
Check the injector timing and exhaust valve clearance as outlined in Fuel Injector Timing and Exhaust Valve
Clearance Adjustment every 50,000 miles. The proper height adjustment between the injector follower and
injector body is of primary importance to emission control.
Item 24 Throttle Delay
Inspect and adjust, if necessary, every 30 months or 50,000 miles.
The throttle delay system limits the amount of fuel injected during acceleration by limiting the rate of injector
rack movement with a hydraulic cylinder. The initial location of this cylinder must be set with the proper gage to
achieve the appropriate time delay.
Inspect the check valve by filling the throttle delay cylinder with diesel fuel and watching for valve leakage
while moving the throttle from the idle to the full-fuel position. If more than a drop of fuel oil leaks, replace the
Inspect the terminals for corrosion and loose connections and the wiring for frayed insulation.
Some alternators have a built-in supply of grease, while others use sealed
bearings. In these latter two cases, additional lubrication is not necessary.
On alternators, the sliprings and brushes can be inspected through the end frame assembly. If the sliprings are
dirty, they should be cleaned with 400-grain or finer polishing cloth. Never use emery cloth to clean the
sliprings. Hold the polishing cloth against the sliprings with the alternator in operation and blow away all dust
after the cleaning operation. If the sliprings are rough or out of round, replace them.
Item 26 Engine and Transmission Mounts
Check the engine and transmission mounting bolts and the condition of the mounting pads every 36 months or
60,000 miles (2000 hours). Tighten and repair as necessary.
Figure 10. Item 25