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Engine Piston and Piston Rod.
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INSTALLATION - TM-5-4210-220-12_310
TM 5-4120-220-12 4-15.  AUXILIARY POWER UNIT - Continued INSPECTION (1) Check  cylinder  wall  out  of  round  and  taper  with  dial gage at two diameters a and b perpendicular to each other.  Check at three different heights as illustrated. (2) If cylinder diameter is more than 0.004 in. (0.10 mm) nominal (see below), or is out of round by more than 0.002  in.  (0.05  mm),  or  is  tapered  more  than  0.004 in. (0.10 mm), cylinder block must either be replaced or rebored to accept an oversize piston. Nominal 3.0732 - 3.0740 in. (78.00 - 78.02 mm) First oversize 3.0929 - 3.0937 in. (78.50 - 78-52 mm) Second  oversize  3.1126  -  3.1134  in.  (79.00  -  79.02 mm) Oversize piston and rings must also be installed. (3) If cylinder diameter is less than 0.004 in. (0.10 mm) nominal (see step 2 preceding), or is out of round by less than 0.002 in. (0.05 mm), or is tapered less than 0.004 in. (0.10 mm), piston rings should be replaced on original piston, if piston is not damaged. (See step 5 following). (4) Restore roughness to cylinder by honing with emery cloth (item 12, Appendix E) soaked in diesel fuel, or with honing tool.  Work in helical movement to obtain a cross hatch surface pattern. (5) Inspect    piston,    removing    any    scale,    or    carbon deposits   on   head.      Measure   piston   skirt   diameter perpendicular to wrist pin bore as illustrated. (6) Maximum skirt wear must not exceed 0.002 in. (0.05 mm) Nominal 3.0693 - 3.0697 in. (77.90 - 77.91 mm) 1st oversize 3.0890 - 3.0894 in. (78.40 - 78.41 mm) 2nd oversize 3.1087 - 3.1091 in. (78.90 - 78.91 mm) Replace piston as required. (7) Measure wrist pin bore for out-of-roundness. Replace   piston   and   wrist   pin   if   out-of-roundness exceeds 0.004 in. (0.10 mm). (8) Inspect    wrist    pin    for    scoring    or    seizure    marks. Replace piston and piston pin if any found. (9) Measure  wrist  pin  diameter  and  wrist  pin  bushing  in piston   rod.      Replace   both   if   clearance   exceeds 0.0025 in. (0.07 mm). 4-171

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