NMWR-9-2815-220 Overhaul Manual for M60 M88 Engine AVDS-1790-2CA, AVDS-1790-2DA, AVDS-1790-2DR Download
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NMWR 9-2815-220 GENERAL MAINTENANCE, OVERHAUL, AND REPAIR PROCEDURES—Continued 0005 00 6. Repair − Continued. b. General Repair of Castings. (1) Replace all castings when cracks have penetrated high stress areas such as fillets or webbing. (2) Replace all castings which do not conform to tolerances specified in the appropriate overhaul inspection procedures. (3) Replace all castings on which machined surfaces are burred or nicked to the point of impairing subsequent assembly or operation. Repair minor damage to machined surfaces with a fine mill file or crocus cloth dipped in cleaning compound solvent. (4) Replace all castings having flanges which are severely warped and cannot be repaired to provide a proper seating surface with its mating part. Repair minor warpage of mounting flanges and mounting pads by working surface across a sheet of crocus cloth held tightly on a surface plate or similar flat surface. (5) Repair damaged pipe threads in tapped holes with a used tap. NOTE Pipe plug threads in castings must be in good condition to prevent oil leakage. (6) Replace damaged screw threaded inserts. Refer to Step 7 of this work package. c. Ball and Needle Bearings. (1) Replace all bearings as noted in the Mandatory Replacement Parts List (WP 0052 00). (2) Replace all galled, pitted, or damaged bearings. (3) Replace all bearings which do not conform to tolerances specified in the appropriate wear limits, fits, and tolerances table. (4) Refer to TM 9-214 for information on inspection, care and maintenance of anti-friction bearings. d. Gears and Shafts. (1) Replace all cracked gears and shafts, and shafts that are bent or twisted. (2) Replace all gears and shafts which do not conform to tolerances specified in the overhaul inspection procedures. (3) Replace all gears and shafts having worn, galled, nicked, burred, or pitted teeth and splines. Remove any sharp fins and burrs from splines with crocus cloth dipped in cleaning compound solvent. (4) Replace all splined gears and shafts that are damaged to the point of impairing assembly or operation. Replace all gears and shafts having splines which do not match properly with mating splines. 0005 00-6 Change 1