TM 9-2815-225-34&P 3-39. PISTON, CONNECTING ROD, AND BEARING REPAIR (Contd) LOCATION/ITEM ACTION REMARKS c.  Inspection (Contd) CAUTION If  one  rod  bearing  half  is  damaged  or  worn,  both  rod  bearing  halves  must  be  discarded. Failure to do so could cause damage to equipment. NOTE Undersize bearing shells can be determined by adding correct amount 0.010, 0.020, 0.030 in. (0.254, 0.508, 0.762 mm) to minimum and maximum dimension of a standard bearing. 22. Rod bearing half (10) a.  Inspect for chipping, flaking, Discard both if chipped, flaked, or scoring. or scored. b.  Using suitable ballpoint Discard both if less than wear micrometer, measure thickness. limit of standard connecting rod bearing half (10) as shown below: Wear Limit  ................................................................... 0.0930 in. (2.362 mm) New Minimum  .............................................................. 0.0942 in. (2.392 mm) New Maximum .............................................................. 0.0947 in. (2.405 mm) d.  Assembly 23. Rod bushing (9) Using connecting rod bushing Ensure oil holes are aligned and driver (ST-1242) (11), install into that a 0.125 in. (3.175 mm) connecting rod (5). diameter rod can move freely through connecting rod (5) and rod bushing (9). 24. Two connecting Install into connecting rod cap (7). rod dowels (6) 25. Piston pin retaining ring Install only one retaining ring (3) (3) into groove of piston pin bore in piston (1). WARNING Wear  rubber  gloves  when  installing  piston  pin  to  prevent  burns  from  boiling  water  or  hot piston.  Failure to comply may result in injury to personnel. 26.  Piston (1) and piston pin (2) a.  Heat piston (1) for 15 minutes in boiling water or in oven set at 210F (100C). CAUTION Never  use  a  hammer  to  install  piston  pin.  This  can  cause  distortion  in  piston  and  piston seizure in cylinder liner.  Ensure edges of piston pin retaining rings are in groove of piston pin bore. b.  Install connecting rod (5) and The piston pin (2) cannot be piston pin (2) into piston (1) installed when temperature of before it cools to 70F (21C). piston (1) is below 70F (21C). c.  Install other piston pin retain- ing ring (3) in groove of piston pin bore in piston (1), opposite the one installed in step 25. FOLLOW-ON TASK: Install piston, connecting rod, and bearings (para. 3-69). 3-186