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 TM 55-1905-219-14-5
3-89.1. CYLINDER HEAD-MAINTENANCE INSTRUCTIONS (Cont)
LOCATION
ITEM
ACTION
REMARKS
INSPECTION AND REPAIR (Cont)
b. Install scrap or dummy
injectors to ensure
proper seating of the
injector tubes. Dummy
injectors may be made
from old injector nuts
and bodies (the
injector spray tips
are not necessary).
Tighten the injector
clamp bolts to 20-25
lb-ft (27-34 Nm) torque.
c. Apply 80-100 psi (552-689
kpa) air pressure to the
water jacket. Then
immerse the cylinder head
in a tank of water,
previously heated to
180200 (82 93 ),
-
F
-
C
for about twenty minutes
to thoroughly heat the
head. Observe the water
in the tank for bubbles
which indicate a leak or
crack. Check for leaks
at the top and bottom of
the injector tubes, oil
gallery, exhaust ports,
fuel manifolds and at the
top and bottom of the
cylinder head.
d. Relieve the air pressure
and remove the cylinder
head from the water tank.
Remove the plates,
gaskets, and injectors
and dry the head with
compressed air.
e. If the pressure check
revealed any cracks,
install a new cylinder
head.
3-1477
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