TM 5-4320-302-146-20. CRANKSHAFT ASSEMBLY (CONT)Location/ItemActionRemarks30. Main bearingInspect and replace for excessive wear, over-bracketheating, distortion, cracking, high spots, orother damage.NOTEIf main bearing bracket is replaced, main bearing supportmust also be replaced.31. Main bearingInspect for excessive wear, overheating, distortion,supportscracking, or other damage. Measure bearing supportwall thickness, which should not be less than 0.1170inch (2.973 mm). If measurement is less than tolerancelimit, replace main bearing supports with normalor oversized wall thickness bearing support.32. Main bearingAssemble bearing bracket, clamping bush, washers,bracket boreand screws. Make sure matchmarks line up properlyand clamp in vise. Make sure threads and seat areasare clean. Lightly lubricate them with MIL-L-2104lubricating oil. Tighten screws alternately and evenly,in small increments, to 22.13 ft lb (30 N.m) torque.Using torque gage No. 101910, tighten screws twoadditional times in increments of 30 degrees.6-177
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