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 TM 55-1905-220-14-5
3-90.2. EXHAUST VALVE - MAINTENANCE INSTRUCTIONS (Cont).
LOCATION
ITEM
ACTION
REMARKS
INSTALLATION - CYLINDER HEAD OFF ENGINE (Cont)
c.
Valve
Inspect.
Inspect the
insert
valve seat in-
counter-
sert counter-
bore
bore in the
cylinder head
for cleanli-
ness, concen-
tricity, flat-
ness and
cracks.
The counter-
bores in a
four valve
cylinder
head have a
diameter of
1.260 inch to
1.261 inch-
(3.200 to
3.203 cm).
and a depth
of .338 inch
to .352 inch
(0.859 to
0.894 cm).
The counter-
bores must be
concentric with
the valve
guides within
.003 inch
(0.0076 cm)
total in-
dicator read-
ing. If re-
quired, use a
valve seat in-
sert which is
.010 inch
(0.025 cm)
oversize on the
outside
diameter.
3-1541
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