Quantcast c.  Inspection and Repair (Contd) - TM-9-2815-225-34P_359

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TM 9-2815-225-34&P 3-51.  AIR COMPRESSOR REPAIR (Contd) LOCATION/ITEM ACTION REMARKS c.  Inspection and Repair (Contd) 40. Piston pin (31) Using suitable micrometer, Discard if not within limits measure outside diameter. shown below. New Minimum .......................................................... 0.6875 in.  (17.4625 mm) New Maximum ........................................................... 0.6876 in.  (17.465 mm) Wear Limit  .............................................................. 0.6872 in.  (17.4549 mm) 41. Piston (29) a.  Inspect for scoring, cracks, Discard if damaged or worn. wear, and other damage. b.  Using suitable micrometer, Discard if not within limits measure outside diameter 1 in. shown below at 70F (21C). (25.4 mm) below and at a right angle to pin bore. New Minimum .............................................................. 3.619 in.  (91.923 mm) New Maximum ............................................................. 3.620 in.  (91.948 mm) Wear Limit ............................................................... 3.6165 in.  (91.8591 mm) c.  Using suitable micrometer, Discard if not within limits measure pin bore. shown below at 70F (21C). New Minimum .......................................................... 0.6880 in.  (17.4752 mm) New Maximum ......................................................... 0.6885 in.  (17.4879 mm) Wear Limit  .............................................................. 0.6890 in.  (17.5006 mm) d.  Check ring grooves as follows: (1) Install new rings (26), (27), and (28) on piston ring grooves. (2) Insert a 0.004 in.  (0.1016 mm) feeler gauge between ring and ring groove. (3) Compress ring into ring Discard piston (29) if ring goes groove. below piston land surface with feeler gauge in place. e.  Check piston ring end gap as follows: (1) Install new rings (26), (27), Use piston head to seat rings and (28) on cylinder bore of squarely on an unworn portion housing (37). of cylinder bore.  Repeat this step until all three rings have been installed. (2) Measure piston ring end Discard any ring with gap not gap with feeler gauge. within 0.010-0.020 in. (0.254-0.508 mm). 3-328


 


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