TM 10-4320-310-145-10.INSPECT/REPLACE CYLINDER HEAD AND VALVE ASSEMBLY (Continued)c.Loosen nut (2) and turn adjustment screw (1)clockwise until rocker touches valve stem.d.Turn adjustment screw (1) another half turn andsecure by tightening nut (2).12Adjust tappet clearance (para 4-22).13If decompression lever does not ratchet, checkclearance of complete pushrod (1) and pinion (2).a.Use feeler gauge to check that clearance (3)between socket of complete pushrod (1) andpinion (2) is 0.039 inch (1.0 mm).b.Check that clearance (4) is 0.039 inch (1.0 mm).c.Clearances can be adjusted by adjustingcomplete pushrod (1) for clearance (3), andadjusting rocker shaft for clearance (4). Toadjust complete pushrod, loosen lower lockingnut on pushrod, turn upper adjusting nut onpushrod to achieve adjustment and tightenlower locking nut to maintain proper adjustment.NoteDuring engine operation, decompression shaftmust not move. Assured clearance willprevent movement.5-24
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