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ARMY TM 9-2815-255-24 AIR FORCE TO 38G1-95-2 MARINE CORPS TM 2815-24/4 NOTE To maintain the correct end play, the two piece main bearing with three piece thrust washer set can be used to replace the two piece flanged main bearings if desired. a. Compare crankshaft journal measurements taken during inspection and determine size which journals are to be reground. b. If  one  or  more  main  or  connecting  rod  journals  requires  grinding,  then  grind  all  of  main  journals  or  all  of connecting rod journals to same required size.  Grind clockwise (opposite engine rotation). c. AD journal fillets radii must be free of any sharp grind marks or scratches.  Fillet must blend smoothly into journal and crank cheek.  Radius may be checked with a fillet gage. d. Care must be taken to avoid localized heating which often produces grinding cracks.  Use coolant generously to cool crankshaft while grinding.  Do not crowd grinding wheel into work. e. Polish  or  lap  (counterclockwise)  ground  surfaces  to  specified  finish.    Reground  journals  will  be  subject  to excessive wear unless polished smooth. NOTE When   thrust   surfaces   are   reground   and   an   oversize   washer   is   used,   crankshaft   end   play specification must be maintained. f. If thrust surfaces of crankshaft are worn or grooved excessively, they must be reground and polished.  Care must be  taken  to  maintain  specified  radius  between  each  thrust  surface  and  bearing  journal.    An  oversize  thrust washer set is available. g. Stone edge of all oil holes in journal surfaces smooth to provide a radius of approximately 0.060 inch (1.50 mm). h. After grinding has been completed, inspect crankshaft by fluorescent magnetic particle method, or other similar method to determine if cracks have originated due to grinding operation. i. Demagnetize crankshaft. WARNING Cleaning solvent Is flammable and toxic to eyes, skin, and respiratory tract Skin/eye protection required.  Avoid repeated/prolonged contact.  Good general ventilation Is normally adequate. WARNING Compressed air used for cleaning can create airborne particles that may enter the eyes Pressure will not exceed 30 psig (207 kPa).  Eye protection required. j. Thoroughly dean crankshaft and oil passages with dry cleaning solvent (P-680).  Dry with compressed air. 3-180


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