TM 10-4320-318-144-30. MAINTENANCE OF ROCKER ARM ASSEMBLY - (Cont)(2) Adjust decompression device as follows:NOTEAdjustment of decompression is necessary for the following conditions: Engine isnot 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 ispresent 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 deviceuntil 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).4-40Figure 4-18 Valve Adjustment
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