TM 5-4320-302-146-16.PISTON ASSEMBLY (CONT)Location/ItemActionRemarks20.Piston pinReplace if finish is destroyed or fretting is visible.21.Piston ringsReplace.22.Piston-to-Replace piston and/or cylinder if clearance is notcylinderwithin tolerance.clearance23.CylinderIf worn or damaged, repair or replace in accordancewith paragraph 6-15.REPAIR24.PistonRemove slight scoring or fretting with P-C-458 crocuscloth. Reclean and repeat procedure if necessary.25.Piston ringsIf gap on new compression ring is insufficient, it maybe increased by filing or stoning the ends of the ring.File or stone both ends of ring so cutting action isfrom outer surface to inner surface. This will preventany chipping or peeling of chrome plate on ring. Theends of the ring must remain square with chamfer onouter edge.26.CylinderIf worn or damaged, repair or replace in accordancewith paragraph 6-15.REASSEMBLY/REPLACEMENTCAUTIONPiston ring breakage may occur if rings are opened more than necessarywhen removing or installing them. Do not strain rings.27. Piston ringsInstall new expanderand expanderspring in oil controlspringring groove.6-120
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