Quantcast c.  Inspection (Contd) - TM-9-2815-225-34P_215

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TM 9-2815-225-34&P 3-39. PISTON, CONNECTING ROD, AND BEARING REPAIR (Contd) LOCATION/ITEM ACTION REMARKS c.  Inspection (Contd) 19. Connecting rod assembly Using suitable micrometer, Do not measure where connecting (4) measure crankpin bore diameter. rod (5) and connecting rod cap (7) meet.  Discard if diameter is not within 3.3157 in. (84.219 mm) and 3.3171 in. (84.254 mm) up to 30 on either side of parting line, 3.3157 in. (84.219 mm) and 3.3167 in. (84.244 mm) 30 on either side of parting line. 20. Connecting rod checking Calibrate. a.  Use new connecting rod assembly fixture (ST-561) (14) (4) that has been checked for cor- rect absolute center length of 12.00 in. (304.8 mm) between bore centers. b.  Perform steps 18a and b. c.  Place new connecting rod assembly (4) into fixture. d.  Place correct piston pin man- drel (15) into piston pin bore. e.  Install expanding arbor (16) into crankpin bore and tighten until snug.  Ensure pin on expand- ing arbor (16) is down and locked in position in center of new con- necting rod assembly (4). f.  Move dial holder until contact points of indicators touch mandrel (15) in piston pin bore. g.  Set indicator dials' checking fix- ture to zero. h.  Remove new connecting rod assembly (4) from fixture.  Turn rod assembly horizontally 180 and put back into fixture (14). i.  If dial indicators show any change from first reading, adjust dials to divide difference.  Fixture is now calibrated. 21. Connecting rod (5) a.  Assemble correct connecting rod assembly (4), pin mandrel (15), and expanding arbor (16). b.  Put into calibrated connecting rod checking fixture (14). c.  Take reading for length. Discard if longer than rod used to calibrate fixture or more than 0.002 in. (0.050 mm) shorter. d.  Take reading for alignment of Discard if difference in readings of bores.  Turn connecting rod is more than 0.010 in. (0.254 mm) assembly (4) 180 and take reading without bushing (9) installed, or again. 0.004 in. (0.101 mm) with rod bushing (9) installed. 3-184


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