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 TM 55-1905-219-14-5
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 concen-
tric 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) over-
size on the out-
side diameter.
3-1559
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