TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
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Malfunction Probable Cause Corrective Action 2. Loss of engine power. a. Air leak in intake manifold. a. Remove turbosuperchargers (table 4-1). Remove intake manifolds (table 4-4). Repair air leak. Install intake manifolds (table 4-4) and install turbosuperchargers (table 4-1). b. Turbosuperchargers worn, b. Refer to 1c, above for corrective action. plugged, or failed. c. Leak in exhaust pipes or c. Repair or replace exhaust pipes and mani- manifolds. folds (table 5-5). 3-8. Troubleshooting Fuel System 1. No fuel being delivered from fuel injector nozzles. 2. Fuel being delivered at nozzles but engine will not stare run, or runs rough on one or more cylinders. 3. Engine runs hot, misfires, or runs rough. a. Plugged primary fuel filter, secondary fuel filter, or fuel/water separator filter or fuel system not free of air. b. Defect in vehicle fuel system. c. Damaged fuel hoses (fuel pump to filter or filter to fuel injection pump). d. Defective fuel pump a. Failed fuel injection pump. f. Failed fuel injection pump coupling. a. Operating with contaminated fuel or partially plugged fuel filters, refer to 1a, above. b. Flame heater not operating (low ambient temperature). c. Fuel injector nozzle and holder not functioning properly. d. Fuel injection pump not timed properly. e. Fuel injection pump not func- tioning properly. a. Restricted induction air supply. b. Low fuel pressure from fuel supply pump or leaking hoses and con- nections. c. Fan clutch slipping. d. Leaking fuel tubes at nozzle and holder assemblies. a. Service primary fuel filter, secondary fuel filter, or fuel/water separator filter. Refer to pertinent vehicle Technical Manual, Appendix A for procedures. b. Troubleshoot vehicle fuel system. Refer to pertinent vehicle Technical Manual, Ap- pendix A for procedures. c. Remove damaged fuel hoses (table 4-1). Install new fuel hoses (table 4-1). d. Troubleshoot fuel pump. Refer to TM 9- 2910-213-34 for procedures. If trouble cannot be corrected remove pump (table 4- 1). Refer to TM 9-2910-213-34 for overhaul. Install pump (table 4-1). e. Remove fuel injection pump (table 4-1). Refer to TM 9-2910-212-34 and overhaul pump. Install injection pump (table 4-1). f. Remove fuel injection pump (table 4-1). Replace coupling (tables 6-29 or 6-45). Install injection pump (table 4-1). a. Drain fuel tank and refill with proper fuel. Refer to pertinent vehicle Technical Manual, Appendix A, for proper fuel. b. Refer to para 3-4 (2 and 3) for corrective action. c. Remove fuel injector nozzle and holders (table. 4-7). Rebuild nozzle and holders (table 4-7). Install nozzle and holder (table 4-7 ). d. Time fuel injection pump (para 4-4). Also refer to TM 9-2910-212-34. e. Remove fuel injection pump (table 4-1). Refer to TM 9-2910-212-34 for overhaul procedures. Install pump (table 4-1). a. b. c. d. Service air cleaner. Refer to pertinent veh- icle Technical Manual, Appendix A, for proper fuel. Remove fuel supply pump (table 4-1). Refer to TM 9-2910-213-34 for overhaul procedures. Install pump (para 7-17a). Tighten all connections and replace damaged hoses. Remove engine fan (table 4-3). Tighten connections. Remove fuel injector tubes (table 4-1). Replace damaged tubes. Install injector tubes (table 4-1). 3-8