TM 5-4320-300-14 6-10.  PISTONS AND CONNECTING RODS (CONT) Location/Item Action Remarks NOTE If undersize bearing shells were installed at an earlier date, the standard minimum worn thickness dimension will not be accurate.  Compare dimen- sions of undersize bearings to the chart below. Bearing Size New Bearing Thickness Minimum Worn Thickness inch (mm) inch (mm) inch (mm) Standard 0.1245/0.1250 (3.1623/3.175) 0.1230 (3.1242) Undersize 0.002 (0.0508) 0.1255/0.1260 (3.1877/3.2004) 0.1240 (3.1496) 0.010 (0.254) 0.1295/0.1300 (3.2893/3.302) 0.1280 (3.2512) 0.020 (0.508) 0.1345/0.1350 (3.4163/3.429) 0.1330 (3.3782) 0.030 (0.762) 0.1395/0.1400 (3.5433/3.556) 0.1380 (3.5052) 17.  Crankshaft Before installing bearings, inspect crankshaft in accordance with paragraph 6-11. WARNING Compressed air used for cleaning shall not exceed 100 psi (690 kPa).  Use goggles or face shield for eye protection.  Do not direct airstream against skin. 18.  Connecting Blow compressed air through spray nozzle rod spray and inspect it for blockage. nozzle 19.  Piston skirt Measure each piston skirt diameter length- Piston skirt diameter diameter wise and crosswise of the piston pin bore. measurement should Piston skirt must measure between 3.8699 be taken at a room and 3.8721 inches (98.2955 and 98.3513 temperature of 70°F mm). 21 C). 20.  Piston out- Measure piston out-of-round and taper. of-round The out-of-round and taper must not ex- and taper ceed 0.0005 inch (0.0127 mm). 6-83