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 OIL PUMP ASSEMBLY OVERHAUL—Continued 0013 00 RECLAMATION – Continued 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. 3. Oil pump impeller drive shaft (part no.11683960). Reclaim worn spacer bearing surfaces by metalspray. Refer to Table 25 (OIP 11683960). (a) Set shaft in external grinder and undercut 1.1315 – 1.1320 in. (28.7401 – 28.7528 mm) spacer bearing surfaces by approximately 0.005 in. (0.127 mm) to 0.0075 in. (0.1905 mm) per side (Figure 2). (b) Thoroughly clean and degrease shaft with cleaning compound degreaser. (c) Prepare bearing surfaces in accordance with standard metalizing procedures as follows: (1) Mask surfaces, not to be coated, with suitable grit blast masking material. (2) Grit blast bearing surfaces with clean, oil free 25 mesh chilled iron grit. (d) Remove grit blast masking material and remask with suitable thermospray or plasmaspray masking material. Figure 2. Oil Pump Impeller Drive Shaft Spacer Bearing Surfaces. 0013 00-5 Change 1