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 TM 55-1905-220-14-4
3-33.2. EXHAUST VALVE - MAINTENANCE INSTRUCTIONS (Cont).
LOCATION
ITEM
ACTION
REMARKS
INSTALLATION - CYLINDER HEAD OFF ENGINE (Cont)
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)
oversize on
the outside
diameter.
d. Cylinder
Heat.
Immerse the
head
cylinder head
for at least
30 minutes in
water heated
to 180 to
F
200 (82to
F
93 ).
C
e. Cylinder
Rest the cylinder head,
head and
bottom side up, on a
valve
work bench and locate
seat
the insert squarely in
insert
the counterbore, seating
face up. Install the
insert in the cylinder
head while the head is
still hot and the insert
3-726
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