Figure 9-33. Removing Upper Main Bearing Shell with Fabricated Removal Tool
Using a micrometer having a ball anvil, measure each bearing shell. Minimum thickness for main bearing shells
shall be in accordance with Table 1-4. If either shell of a bearing set is under the minimum thickness, replace
Inspect the crankshaft journals and thrust flange as follows:
Visually inspect the journal for cracks, nicks, pitting, scoring, or grooving. Replace the crankshaft in
accordance with paragraph 9-27 if cracked. Rebuild the crankshaft in accordance with paragraph 9-28 if
surface defects are over 0.003 inch (0.08 mm) deep.
Using a main bearing journal micrometer, check the journal for wear, out-of-round, and taper. Rebuild the
crankshaft 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 full
length of the journal.