TM 5-3895-346-14
ENGINE OVERHAUL
FUEL INJECTOR TIMING
FUEL INJECTOR TIMING
To time an injector properly, the injector follower must be adjusted to a definite height in relation to the injector
body.
All of the injectors can be timed in firing order sequence during one full revolution of the crankshaft. Refer to
the General Specifications at the front of the manual for the engine firing order.
Time Fuel Injector
After the exhaust-valve clearance has been adjusted (Exhaust-Valve Clearance Adjustment!), time the fuel
injectors as follows:
1.
Place the governor speed control lever in the idle speed position. If a stop lever is provided, secure
it in the stop position.
2.
Rotate the crankshaft, manually or with the starting motor, until the exhaust valves are fully
depressed on the particular cylinder to be timed.
CAUTION
If a wrench is used on the crankshaft bolt at the front of the engine, do not turn the
crankshaft in a left-hand direction of rotation or the bolt may be loosened.
3.
Place the small end of the injector timing gage in the hole provided in the top of the injector body
with the flat of the gage toward
Figure 1 . Timing Fuel Injector
the injector follower (Fig. 1). Refer to Table 1 for the correct timing gage (for vehicle engines, refer to Engine
Tuneup).
4.
Loosen the injector, rocker arm, push rod locknut.
5.
Turn the push rod and adjust the injector rocker arm until the extended part of the gage will just
pass over the top of the injector follower.
6.
Hold the push rod and tighten the locknut. Check the adjustment and, if necessary, readjust the
push rod.
7.
Time the remaining injectors in the same manner as outlined above.
8.
If no further engine tuneup is required, install the valve rocker cover, using a new gasket.
420
