TM 5-3805-258-24-2ENGINEDISASSEMBLY AND ASSEMBLYPISTONSASSEMBLE PISTONS1214-16Tools NeededA7S9470Ring Expander11.2.3.4.5.Install the connecting rod (4) in the piston withthe bearing tab groove (slot) (1) on the sameside as the cutout (depression) (3) on the headof the piston.Install piston pin (2) and retaining rings (5) inpiston.When old pistons are to be used, clean thepiston grooves with an acceptable piston groovecleaning tool.Install the spring for the oil ring. Install the oilring with tool (A). The gap in the ring must beapproximately 180° from the oil ring springconnections.The two compression rings have marks “UP-1”and “UP-2”. The rings must be installed withthese marks toward the top of the piston with“UP- 1” as the top ring. After installation of allthree piston rings, put piston rings in positionso gaps in rings are 120° apart.NOTE: Compression rings that do not have identifi-cation can be installed either way.6.7.To check the clearance between the piston ringgrooves and rings, see SPECIFICATIONS.See SPECIFICATIONS to check the clear-ance between the ends of the piston rings (endgap).end by:a) install pistons5-134
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