TM    5-2815-241-34&P PISTON  AND  CONNECTING  ROD  -  CONTINUED ACTION LOCATION ITEM REMARKS 8. Piston   (1) a.  Using  5-  to  6-inch  micrometer, measure  piston  skirt  diameter  at  right angle to piston pin bore. For barrel ground pistons proceed with step b. For  straight  or  tapered  ground  pistons proceed  with  step  c. b. Measure at location A. If diameter is less than 5.483 inch (139.27  mm),  discard  piston. c.  Measure  at  location  B  and  C. If  diameter  is  less  than  5.483  inch (139.27   mm),   discard   piston. 9. Piston  pin  (6) a. Using 1-to 2-inch micrometer, measure  outside  diameter. If  outside  diameter  is  less  than  1.9978 inch   (50.754   mm),   discard   piston pin. b.  Using  1-  to  2-inch  micrometer,  check piston  pin  for  out-of-round  condition. If piston pin is out-of-round more than 0.001 inch (0.03 mm), discard piston   pin. T A     2 4 2 4 8 9 2-223