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Piston Installation (cont)
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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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Piston/Sleeve Installation
TM 5-4210-220-34 3-8. ENGINE - Continued (21)  The clearance on rectangular compression ring # 2 should be 0.0100 - 0.013 in.  (0.254 - 0.330 mm). (22)  Clearance on rectangular compression ring # 3 should be 0.0040 - 0.0070 in.  (0 102 - 0.178 mm). (23)  Repeat procedure for oil control rings.  The gap for the rings in the lower groove must be 0.0100 - 0.0250 in. (0.254 - 0.635 mm) and 0.0070 - 0.0170 in.  (0.178 - 0.432 mm) in  upper  groove.    The  clearance  for  both rings installed in each groove must be 0.0015 - 0.0055 in. (0.038 - 0.140 mm). NOTE New    piston    rings    must    be    installed whenever a piston is removed.  The top fire ring  (A)  and  the  second  groove  ring (B) are pre-stressed.  Both are identified by  an  indentation  mark  on  the  top  side. The   fire   ring   is   chrome   plated   on   the lower side. (24)  Starting with bottom ring (C), install compression   rings   with   expander   J8128. Do     not     spread     them     any     more     than necessary   to   slip   them   over   the   piston. Stagger ring gap 180 deg.  from each other. (25)  Place piston on bench, inverted. (26)  Install   the   ring   expanders   (D)   in   the   oil control   ring   grooves   in   the   piston   skirt. Install    with    free    ends    pointing    towards piston crown.  Use care not to overlap ends of  expanders  which  would  result  in  oil  ring breakage. NOTE The scraper edges of all oil control rings must  face  downward  toward  bottom  of piston for proper oil control. (27)  Install  oil  control  rings  by  hand.    Start  with  the  upper  half  (E)  of  the  top  oil  ring,  locate  gap  180  deg.    from expander gap (D).  Ring has chrome outside diameter and is color coded with orange stripe. (28)  Install lower half (F) of the top oil ring.  Locate gap 90 deg.  from upper half.  Ring is not chromed and is color coded with orange stripe. (29)  Install the upper half (G) of the bottom oil ring.  Locate gap 180 deg.  from expander gap. (30)  Install  the  lower  half  (H)  of  the  bottom  oil  ring.    Locate  gap  90  deg.    from  upper  half  both  rings  slotted  on bottom side and are plain black. (31)  Lubricate piston grooves and rings with engine oil.  (item 17, Appendix B). 3-171

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