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INSPECTION - TM-5-4210-220-12_309
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INSTALLATION (cont) - TM-5-4210-220-12_311
TM 5-4210-220-12 4-15.  AUXILIARY POWER UNIT - Continued 4-15.10  Engine Piston and Piston Rod - Continued (10) Remove  rings  with  expander  and  scrape  away all   carbon   deposits   from   ring   grooves   (Use discarded ring if required). (11) Install   new   rings   in   cylinder    and    check    for perfect  mating  between  ring  and  cylinder  wall. Measure   ring   end   gap.      File   ring   ends   as required. End gap for compression ring should be 0.010 - 0.016  in.  (0.25  -  0.40  mm),  for  oil  control  ring, 0.008 - 0.014 in. (0.20 - 0.30 mm). (12) Install   rings   on   piston   and   measure   ring   to groove clearance.  Top ring is chromium plated. Replace     piston     and/or     rings     if     wear     limit exceeds that shown. WEAR LIMITS A 0.009 in. (0.22 mm) B 0.007 in. (0.17 mm) C 0.007 in. (0.17 mm) D 0.005 in. (0.12 mm) (13) Check     alinement     of     piston     rod     bores     as illustrated.  Replace if bending or twist exceeds 0.002   in.   (0.05   mm).      Bend   or   twist   may   be straightened in press if less than this figure. (14) Measure  crankshaft  journal  for  wear.    If  wear exceeds 0.004 in. (0.10 mm), regrind crankshaft and fit undersize bearings, see para. 4-15.12. Crank pin diameter is nominally 1.5756 - 1.5760 in. (39.9 - 40.00 mm), 1st undersize is 1.5658 - 1.5662 in. (39.74 - 39.75 mm), 2nd undersize is 1.5560 - 1.5563 in. (39.745 - 39.755 mm) INSTALLATION (1) Ensure piston ring gaps are 180 deg. apart. (2) Swab cylinder and piston with lubricating oil (item 17, Appendix E). (3) Install piston rod in piston, slide piston pin into piston and secure with retaining ring. 4-172

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