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 TM 55-1905-220-14-6
3-165.2.
EXHAUST VALVE - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
INSPECTION (Cont)
15.
a. Remove and discard the
valve
valve guide oil seals,
guides
if used.
(12)
b. Clean the inside dia-
meter of the valve
guides with a brush.
This brush will remove
all gum or carbon de-
posits from the guides,
including the spiral
grooves.
c. Inspect the valve guides
for fractures, chipping,
scoring, or excessive
wear. Check the valve-
to-guide clearance,
since worn valve guides
may eventually result
in improper valve seat
contact. If the clear-
ance exceeds .005 inch
(0.0127 cm), replace
the valve guides.
16.
Inspect the valve seat
valve
inserts for excessive
seat
wear, pitting, crack-
insert
ing or an improper
(12)
seat angle. The proper
angle for the seating
face of both the valve
and insert is 300.
When a valve seat insert
has been ground to such
an extent that the 300
angle will contact the
cylinder head, install
a new insert.
3-2782
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