TM 5-3805-262-344-1. ENGINE MAINTENANCE (CONT)d. CrankshaftandMainBearings(Cont).INSPECTION/REPAIR (SHEET 2 OF 3)(5)Check connecting rod journals forwear using micrometer. If diame-ters are smaller than 2.748inches use undersize (0.002 inch)inserts. If connecting rod jour-nals are worn more than 0.002inch, grind undersize to follow-ing dimensions:Outer DiameterUndersize (inch)0.0100.0200.030NOTEIf one or more journals are to be2.738 to 2.7392.728 to 2.7292.718 to 2.719ground, grind all journals.(6) Measure front and rear of each journal using micrometer, checking taper.If taper exceeds 0.0005 inch, connecting rod journals must be ground.Check connecting rod journals 90 degrees from first measurements forout-of-roundness. If out-of-roundness exceeds 0.0005 inch, connecting rodjournals must be ground.NOTEIf crankshaft journals are reground, repeat steps (3) through (6) above.(7) Using micrometer, measure thicknessof thrust washers (15). Replacethrust washer if thickness is lessthan 0.147 inch.(8)Inspect crankshaft gear (19) forcracks, missing or broken teeth,scoring, pits, or excessive wear.(9)Inspect main bearing liners (16 and17) for cracks, scoring, pitting,flaking, or signs of overheating.Check liner back for bright spots.(10) Check main bearing caps (12 thru 14) bore diameter as follows:4-24
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