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 CRANKCASE ASSEMBLY OVERHAUL—Continued 0006 00 REPAIR 1. Refer to WP 0005 00 for general repair instructions. 2. Repair of crankcase by welding is permissible except in areas of high stress such as radii, webbing, and bosses. Refer to WP 0005 00 for general welding instructions of aluminum castings and (a) through (c) below for specific information on repair and welding of the crankcase. (a) Crankcase welding. Repair of crankcases by welding is permissible except in the areas shown in Figures 4 through 6. Repair by blending of nicks, grooves, or impact damage on the inside of the crankcase, on the underside of the cylinder deck machined surface, is permitted providing damage does not progress into restricted area. Welding is permitted in the fillet area adjacent to the side wall of the crankcase. Damaged cylinder stud holes may be repaired, but the entire missing sections may not be replaced. Machined surface mounting bosses or pads which have been damaged by fretting, scoring, and impact may also be repaired except those areas indicated in Figures 4 through 6. Weld surfaces must be restored to specified dimensions by machining. Figure 4. Typical Crankcase Highly Stressed Areas – 3/4 Right Rear View. 0006 00-8 Change 1