NMWR-9-2815-220 Overhaul Manual for M60 M88 Engine AVDS-1790-2CA, AVDS-1790-2DA, AVDS-1790-2DR Download
Page 87 of 1014
NMWR 9-2815-220 CRANKCASE ASSEMBLY OVERHAUL—Continued 0006 00 INSPECTION – Continued 3. Refer to WP 0005 00 and the OIPs in Table 1 for specific inspection criteria for selected items. 4. Discard all mandatory replacement parts. Refer to Figure 13. Table 1. Components Requiring Overhaul Inspection. COMPONENT OIP Diesel engine block (item 1, Figure 13) 11684087 (Table 3) Crankshaft oil seal housing assembly (item 3, Figure 13) 8725144 (Table 4) Crankshaft support (item 10, Figure 13) 8725181 (Table 5) Engine crankcase tie rod (item 20, Figure 13) 8725254 (Table 6) Crankshaft main thrust bearing cap (item 22, Figure 13) 7320476 (Table 7) Crankshaft main bearing cap (item 24, Figure 13) 8725141 (Table 8) RECLAMATION 1. Crankshaft main bearing caps can be reclaimed by metal spray according to the procedures outlined below. This procedure details the reclamation of two areas on the caps, the main bearing fit and side mating faces (to block). Refer to OIP 7320476 (Table 7) and OIP 8725141 (Table 8). NOTE To demonstrate proficiency and attain certified status, an operator shall flame spray a test piece in accordance with this specification which shall be destructively and metallographically examined to assure bond integrity and coating soundness. To maintain certified status, an operator must consistently produce acceptable repairs relative to the flame sprayed coating and pass a yearly destructive examination for bond and coating integrity. (a) Degrease caps and bevel all sharp edges. (b) Wash areas to be coated using Metco solvent. (c) Mask cap bottom mating face before grit blasting and spraying the main bearing fit with 0.010 – 0.020 in. (0.254 – 0.508 mm) thick copper, brass, or steel. Use Anti-Bond on steel masking material. NOTE It is not necessary to mask other areas of the cap in preparation for blasting or spraying of the side mating faces, provided the caps are sitting on the bottom mating faces. The side mating faces of many caps, placed next to each other, can be grit blasted and sprayed at the same time. (d) Grit blast areas to be sprayed using G25 angular steel grit, sprayed at 60 psi. (e) Preheat area to be sprayed to approximately 200 F (93 C) using the 6P Thermospray gun. 0006 00-5 Change 1 ° °