TM 10-4320-318-14
4-30. MAINTENANCE OF ROCKER ARM ASSEMBLY - (Cont)
(2) Adjust decompression device as follows:
NOTE
Adjustment of decompression is necessary for the following conditions: Engine is
not decompressed when decompression lever is between positions 1 and 2.
Engine has no compression when decompression lever is at position 0.
(a) Place decompression lever in position 0 (Figure 4-17).
(b) Use hand crank to turn engine until compression resistance can be felt or until gap clearance is
present between rocker arms and valve stems.
(c) Place compression lever at position 1 (Figure 4-17).
(d) Loosen nut (1, Figure 4-19) with box wrench and turn adjusting screw (2) of decompression device
until the rocker arm touches the valve stem. Then tighten adjusting screw another third to half turn
(120 -180 degrees) and secure by tightening nut (2).
4-40
Figure 4-18 Valve Adjustment
