TM 5-4310-393-14
4.
Adjusting the Decompression Screw.
NOTE
Adjustment of the decompression screw (Figure 5-32, Item 3) is required if the
engine does not decompress when the decompression lever is in position.
a.
Turn
the
engine
in
the
same
direction as for adjusting tappet clearance.
b.
Put
decompression
lever
in
FREEWHEEL position (Figure 4-3).
c.
Using
box
wrench
loosen
nut
(Figure 5-32, Item 2) and turn adjustment screw (1)
clockwise until rocker touches valve stem.
d.
Turn adjustment screw (1) another
half turn and secure by tightening nut (2).
FIGURE 5-32. DECOMPRESSION ADJUSTMENT
5.
Adjusting the Pushrod Clearance(s)
NOTE
Check
clearance
of
complete
pushrod (Figure 5-33, Item 1) and
pinion (2).
a.
Use feeler gauge to check that
clearance (3) between socket of complete pushrod (1)
and pinion (2) is 0 039 inch (1.0 mm).
b.
Check that clearance (4) is 0.039
Inch (10 mm).
c.
Clearances can be adjusted by
adjustment complete pushrod (1) for clearance (3) and
adjusting rocker shaft for clearance (4).
NOTE
During
engine
operation.
Decompression shaft must not move.
FIGURE 5-33. PUSHROD ADJUSTMENT
F.
Repair.
1.
Permitted Repairs.
a.
If the inside diameter of the cylinder head guide (Figure 5-34, Item 1) exceeds 0 2780 Inch (7 059
mm), replace the guide. Press out the valve guide.
5-25
