4-15. AUXILIARY POWER UNIT - Continued
4-15.7 Engine Injector.
This task covers
Tool Kit, Master Mechanic,
Main Engine Shutdown (see para. 2-10)
APU Shutdown (see para. 2-12)
The injector can be replaced with APU in truck.
Remove high pressure injector feed line
(4) and clamp retaining bolt (5).
Pull fuel return hoses (6, 7) off barbed
couplings on fuel injector.
Remove both nuts (1) and washers (2).
Remove plate (3) and starting aid plug
Pull injector out of cylinder head.
If a new injector is being installed remove cylinder head, see para. 4-158.
Install injector in cylinder head. For new injector, check nozzle tip protrudes but of head by 0.10 - 0.12 in.
(2.5 - 3.0 mm). Adjust with shims between injector and head.
Slide starting aid plug retaining clip (8) over left hand stud.
Install injector retaining plate (3), washers (2), and nuts (1).
Tighten nuts to 9 ft lb (12 Nm).
Install high pressure injector feed line (4) and clamp retaining bolt (5).
Install fuel return lines (6 and 7).
Start engine and check for fuel leaks. Tighten or replace hoses as required.