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ARMY TM 9-2815-255-24 AIR FORCE TO 38G1-95-2 MARINE CORPS TM 2815-24/4 FIGURE 3-144.  Assembled Piston, Pin, and Connecting Rod (3) Insert piston pin (B) into piston pin bore.  Install new piston pin retaining rings (C) with sharp edge of ring facing away from piston pin.  Check to be sure retaining rings are seated in grooves of piston pin bore. CAUTION Always   refer   to   manufacturer's   specifications   for   ring   Identification   markings   and   locations before  Installation.    Failure  to  Install  rings  In  the  proper  locations  will  result  in  equipment damage. b. Install new piston rings (8, FIGURE 3-124) as follows: (1) Using piston ring expander, install oil ring expander in bottom ring groove.  Position end gap over either end of piston pin. (2) Install oil control ring in bottom ring groove over ring expander.  Install with end gap on opposite side of piston from ring expander gap. NOTE A dye stain is added to rectangular and keystone compression rings for added identification. (3) Rectangular  compression  ring  (FIGURE  3-145)  is  marked  with  two  depressions  or  with  word  TOP  to identify top side of ring.  Install rectangular compression ring in center ring groove with mark toward top of piston. 3-204


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