TM 9-2815-225-34&P 3-37.  CRANKSHAFT REPAIR (Contd) LOCATION/ITEM ACTION REMARKS b.  Inspection (Contd) NOTE Perform step 6 for crankshaft dimensions and measurements for M915/Big Cam I only. 6.  Crankshaft a.  Measure crankshaft journals Check crankshaft thrust flange for wear (refer to Table 1). at No. 7 main bearing for scoring, Journals worn out-of-round more scratches, nicks, and breaks.  If than 0.002 in. (0.051 mm) will surface is scored or scratched, make it necessary to regrind flange should be reground. crankshaft. b.  Measure crankshaft thrust flange by checking dimensions (Table 1, No. 8).  If wear does not exceed 0.003 in. (0.0762 mm) at any one point, flange condition is acceptable.  If wear is 0.003 in. (0.0762 mm) or more, regrind flange to restore flatness. c.  If total wear and regrinding does not exceed 0.005 in. (0.127 mm), standard thrust rings may be used. d.  If worn more than 0.007 in. (0.1778 mm), flange should be ground for 0.010 or 0.020 in. (0.254 or 0.508 mm) oversize thrust rings or built up by electric arc welding and reground to specifications (Table 1, No. 8). Regrinding must clean up a minimum of 90 percent of thrust surface and result in maintaining an installed crankshaft end clearance below 0.015 in. (0.381 mm). e.  Crankshafts with oversize thrust rings should be stamped on rear crankshaft counterweight. Both thrust ring size and ring location should be included in stamping.  For example: Front .............................................................................. 0.010 in. (0.254 mm) Rear  .............................................................................. 0.020 in. (0.508 mm) 3-154