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 TM 55-1905-221-14-2
5-15.
CYLINDER HEAD (Continued).
LOCATION/ITEM
ACTION
REMARKS
INSPECTION (Cont)
b.
Valve Guides.
1.
Inspect the valve guides
for fractures, chipping,
scoring, or excessive
wear.
2.
Check the valve-to-guide
clearance, since worn
valve guides may eventually
result in improper valve
seat contact.
3.
If the clearance exceeds
.006 inch (0.015 cm),
replace the valve guides.
c.
Exhaust Valve Seat Inserts.
1.
Inspect the valve seat
inserts for excessive
wear, pitting, cracking
or an improper seat angle.
2.
The proper angle for the
seating face of both valve
.
and insert is 30
d.
Cylinder Head.
1.
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 over-
heated because of coolant
loss, the resultant high
temperatures cause stresses
to occur in the casting
which will affect the
flatness of the head.
5-355
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