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 TM 55-1905-220-14-5
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 180 200 (8293 ),
-
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.
3-1459
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