TM 9-879
43
ENGINE
7_TAPPET
ADJUST-
ING
SCREW
2—ADJUSTING
SCREW
LOCK NUT
3—
TAPPET BODY.
4—
VALVE STEM.
RAPD 310271
figure 1 6~yalve
Tappet Adjustmenf
adjusted) in the other cylinder is at highest
position
(valve fully
open).
Inlet valves are located nearest
the
carburetor
manifold.
(4)
Loosen adjusting screw lock nut
("2,"
fig. 16)
slightly before
turning adjusting screw
(fig.
16).
(5)
Adjust inlet valve
tappets to 0.004-tnch
minimum,
and
0.005-
inch
maximum
clearance between
valve
stems and
tappet
("1"
and
"4."
fig.
16).
Use thickness
gage to determine
clearance:
recheck
(correcting
if necessary) clearance
after lock nut
has been
securely
tightened.
(6)
Adjust
exhaust valve tappets to
0.006-inch
mimmum,
and
0.
007-inch
maximum clearance
between valve stems and
tappet. Use
thickness gage
to determine clearance; recheck (correcting
if
neces-
sary) clearance after lock
nut has
been
securely tightened.
(7)
Before
turning down
valve spring covers, inspect paper gasket
between each cover and
tappet
guide. If
broken or
damaged, fit
a new
gasket
to prevent
oil leak.
Turn down and securely tighten
valve
spring covers.
75
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