TM 5-4320-302-146-20. CRANKSHAFT ASSEMBLY (CONT)Location/ItemActionRemarks33. Main bearingIf main bearing bracket bore is within or justsupport boreslightly outside tolerance limits or if a newmain bearing bracket is being used, loosenscrews alternately and evenly far enough to beable to install main bearing supports and pin.Make sure matchmarks are correctly alined ifnew supports are not being installed. Make suresupport with oil passage is installed in uppermain bearing bracket. If new brackets or sup-ports are being installed, matchmark them.Tighten and retighten screws as in step 32.Measure main bearing support bore with precisionmicrometer at points 1 and 2 and along axis A andB as in step 32. Measurements for a normal sizemain bearing support should be 2.3638 to 2.3655inches (60.040 to 60.083 mm). If any measurementis not within these tolerance limits, replace mainbearing support.6-179
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