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 TM 55-1905-221-14-2
5-15.
CYLINDER HEAD (Continued).
LOCATION/ITEM
ACTION
REMARKS
INSPECTION (Cont)
3.
Check the valve seat inserts
for cracks or burning. Also
check the valve guides for
scoring.
4.
Inspect the cam follower
bores in the cylinder head
for scoring or wear. Light
score marks may be cleaned
up with crocus cloth wet
with fuel oil. The inside
diameter of the bores are
1.062 inches (2.697 cm) to
1.063 inches (2.700 cm)
in a new cylinder head
(1.065 inches (2.705 cm)
maximum on a used head). If
the bores are excessively
scored or worn so that the
cam follower-to-head clearance
exceeds .006 inches (0.015 cm),
reject the cylinder head.
5.
Check cylinder head water
nozzles for looseness.
REPAIR/REPLACEMENT
8.
Cylinder
a.
Replace cylinder head if
Head
damaged beyond repair.
b.
Over a prolonged period of
operation, the cylinder head
may assume a contour to match
that of the cylinder block,
which is normal. However, if
the cylinder head is allowed
to become overheated because
of coolant loss, the resultant
high temperatures cause stresses
to occur in the casting which
5-359
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