TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download

Malfunction (b) Blue smoke indicating presence of engine oil in combustion chamber. (c) Black smoke indicating a rich fuel mixture. Note: Black smoke during acceleration is normal. 9. Engine noise. (a) Abnormal noise. knocking (b) Tapping noise. (c) Grinding or squeaking noise. Probable Cause b. c. d. a. b. c. d. a. b. c. d. e. f. g. a. b. c. a. b. a. Defective fuel injector nozzle gaskets. Water in fuel. Low compression. One or more cylinders not firing. Worn or stuck piston rings or worn cylinder. Worn valve guides. Worn turboeupercharger oil seals. Restriction in air supply system. Failed turbosupercharger (ex- cessive smoke for afflicted engine bank). Fuel injector nozzles not func- tioning, dripping, or retaining Operating with improper fuel. Fuel injection pump improperly adjusted. Fuel injection pump not properly timed. Fuel injection pump advance unit not functioning properly. Loose piston pin or pins or broken piston rings. Worn engine bearings. Scored piston or cylinder. Excessive Worn or arm valve clearances. damaged valve rocker Accessories damaged. 1. Fuel injection pump. 2. Generator. Corrective Action b. c. d. a. b. c. d. a. b. c. d. e. Replace fuel injector nozzle gaskets (para 7- 11a). Refer to item 7c, above, for other corrective action. Service fuel filters and drain fuel tanks. Refer to 4a, above. Check cylinder compression, refer to 2j, above. Replace defective parts. Refer to 3, above, for corrective action. (Replace engine.) Remove cylinders and pistons and replace rings and worn parts. Refer to 2h, above. Remove cylinder and replace valve guides. Remove turbosupercharger (Table 5-1). Overhaul turbosupercharger refer to TM 9- 2990-200-34 for procedures. Install tur- bosupercharger (para 7-17b). Refer to para 3-7. Remove turbosupercharger (Table 5-1). Overhaul turbosupercharger refer to TM 9- 2990-200-34 for procedures. Install tur- bosupercharger (para 7-17b). Overhaul fuel injector nozzle and holder assemblies. Refer to 7c, above, for corrective action. Replace springs. Check fuel. Refer to 4a, above. Adiust fuel iniection pump. Refer to TM 9- 2910-212-34 for adjustment procedures. f. Time fuel injection pump (para 4-4). Also refer to TM 9-2910-212-34. g. Refer to 41, above, for corrective action. a. Remove cylinders and pistons (table 5-9). Rebuild pistons, rings, and pins (table 6- 12). Install pistons and cylinders (table 7- 4). b. Disassemble engine (chapter 5). Rebuild c. a. b. crankshaft, connecting rod assemblies, and bearings (table 6-8). Assemble engine (chapter 7). Remove cylinder and piston (table 5-9). Overhaul cylinder (table 6-14). Install piston and cylinder (table 7-4). Adjust valve clearances ( para 4-23). Remove valve rocker arm covers. (Refer to table 4-6. ) Disassemble rocker arm covers. Replace valve rocker arm assemblies. Assemble rocker arm covers. Install valve rocker arm covers. a. Replace damaged engine accessories. 1. Remove fuel injection pump (table 4-1). Refer to TM 9-2910-212-34 and overhaul fuel injection pump. Install injection pump (table 4-1). 2. Remove generator (table 4-1). Refer to TM 9-2920-224-35 and overhaul generator. Install generator (table 4-1). 3-5