4-77. INJECTOR. (See figure 4-50.)
Inspection. Inspect injector for looseness and
signs of leakage or smoking.
Cleanliness is extremely important when
working with fuel injectors. Infection
nozzle service troubles are, in most
instances, caused by dirt. Use clean paper
on the work bench and place components
in a container of clean diesel fuel as they
(1) Remove rocker housing cover (7, figure 4-
59) by removing bolts (5) and washers (4).
(2) Remove rocker arm housing (8) by lifting
straight up. Mark its position for best fit
(3) Remove screws (1, figure 4-50), clamp (2),
and link (3).
Use care when removing injectors to
prevent damage to the tip.
(4) Remove injector from cylinder head using
an injector puller or by using two small pry
bars, or by using a slide hammer with an
(5) Tag and number injectors by cylinder from
which they were moved.
(6) Refer to next higher level of maintenance
for injector testing, repair, and calibration.
(7) Position injector in cylinder head.
(8) Install capscrew (1), clamp (2), and link (3).
Tighten capscrews to 11 to 12 foot-pounds
(15 to 16 joules) increments of 4 foot-
pounds (5 joules).
(9) Refer to paragraph 4-87 and adjust rocker
arm associated with fuel injector being
(10) Install rocker arm housing (see figure 4-59).
(11) Install gear case cover (7, figure 4-59) using
bolts (5) and washers (4).
4-78. TURBOCHARGER. (See figure 4-40.)
Inspection. (See figure 4-51.)
(1) Operate engine at approximate rated output
and listen for unusual turbocharger noise
and check for excessive black smoke. Do
not mistake whine heard during rundown for
one that indicates impeller shaft bearing
failure during operation. Other unusual
noises can result from improper clearance
housing. If such noises are heard, replace
turbocharger. For repair of turbo charger,
refer to next higher level of maintenance.
(2) Inspect for an accumulation of dirt on the
compressor impeller vanes and in the
(3) Clean the turbocharger and surrounding
Specification P-D-680, Type II.
(4) Loosen the clamps which secure air hose to
the turbocharger and remove the hose from
the turbocharger. Remove air hose from air
cleaner outlet to turbocharger inlet.
(5) Inspect the turbocharger compressor wheel
and compressor housing for dirt. If the
coating of dirt is light and even, cleaning the
compressor wheel is not necessary. An
uneven buildup of dirt will disturb the
balance of rotating parts and lead to failure
of the turbocharger. If the coating