TM 5-4320-302-146-15.CYLINDER (CONT)Location/ItemActionRemarks12. Piston ringsa.Check that piston ring gaps are offset by 120 degrees. The piston ring setcontains three rings:No. 1 - Double trapezoidal compression ringNo. 2 - Tapered compression ringNo. 3 - Spring-loaded oil control ringb.Compress rings with piston ring compressor No. 130530.6-105
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