TM 5-4320-302-146-20. CRANKSHAFT ASSEMBLY (CONT)Location/ItemActionRemarks22. CrankcaseMeasure bore with precision micrometer. Measure-bore drivement should be 2.4392 to 2.4399 inches (61.955shaft bearingto 61.974 mm). If measurement is not withinthese tolerance limits, replace crankcase.23. Cylinder seatsInspect seats. Make sure they are smooth andflat. Use a steel straightedge to check flatness.If seats are damaged beyond repair, replacecrankcase. If seats can be ground smooth orhave minor nicks or burrs, repair in accordancewith REPAIR instructions.6-173
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