TM 9-6115-604-34NAVFAC P-8-633-34Figure 9-33. Removing Upper Main Bearing Shell with Fabricated Removal Tool(3)Using a micrometer having a ball anvil, measure each bearing shell. Minimum thickness for main bearing shellsshall be in accordance with Table 1-4. If either shell of a bearing set is under the minimum thickness, replaceboth shells.(4)Inspect the crankshaft journals and thrust flange as follows:(a)Visually inspect the journal for cracks, nicks, pitting, scoring, or grooving. Replace the crankshaft inaccordance with paragraph 9-27 if cracked. Rebuild the crankshaft in accordance with paragraph 9-28 ifsurface defects are over 0.003 inch (0.08 mm) deep.(b)Using a main bearing journal micrometer, check the journal for wear, out-of-round, and taper. Rebuild thecrankshaft in accordance with paragraph 9-28 if it is worn more than the limits specified in Table 1-4, out-of-round more than 0.002 inch (0.05 mm), or tapered more than 0.0005 inch (0.013 mm) over the fulllength of the journal.9-62
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