TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
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10. Rough or poor idling. 11. Engine surges at all speeds. 12. Poor fuel economy. 13. Engine stops suddenly. 14. Engine will not stop when shut off. Probable Cause 3. Turbosupercharger. 4. Fuel pump b. c. d. Failed engine bearings or gears. Dry valve rocker arm shafts and rocker arm bushing-type bearings. Cooling fans rubbing housing. a. Some cylinders not firing. b. Nozzles not functioning properly. c. Air leak in intake manifold system. d. Fuel injection pump not properly timed. a. Fuel injection pump governor improperly adjusted. b. Injection pump linkage sticking or binding. a. Engine operating at below normal temperature. b. Operating with improper fuel. c. Air intake system restricted. d. Exhaust system restricted. e. Loss of power or low power. a. Plugged or damaged fuel supply system or fuel pump fails to operate properly. b. Failed fuel injection pump coupling. c. Fuel injection pump fails to operate properly. d. Seizure of internal engine com- ponents. a. Fuel cutoff in fuel injection pump inoperative. b. Binding fuel injection pump control linkage. Corrective Action 3. Remove turboeupercharger (table 4-1). Refer to TM 9-2990-200-34 and overhaul turbosupercharger. Install tur- bosupercharger (table 4-1). 4. Remove fuel pump (table 4-1). Refer to TM 9-2910-213-34 and overhaul pump. Install fuel pump (table 4-1). b. Use wrench - 5120-793-7895 and turn engine over by hand. If engine turns hard and grinding or squealing noiee persists, disassemble engine (chapter 5) and inspect. Replace damaged parta. Assemble engine (chapter 7). c. New or dry engine must be run at fast idle to get oil up to rocker arm bushing-type bearings. d. Adjust cooling fan clearance (fig. 4-88). a. Refer to 7, above for corrective action. b. Refer to 7c, above, for corrective action. c. Refer to para 3-7 for corrective action. d. Time fuel injection pump (para 4-4). Also refer to TM 9-2910-212-34. a. Adjust fuel injection pump governor. Refer to TM 9-2910-212-34 for procedure. b. Clean linkage and inspect for binding or sticking condition. Refer to pertinent vehicle Technical Manual, Appendix A. Lubricate linkage. a. Refer to 7 and 8, above, for corrective action. Increase engine operating tem- perature. b. Drain fuel tanks and refill with proper fuel. Refer to pertinent vehicle Technical Manual, Appendix A, for proper fuel. c. Refer to para 3-7 for corrective action. d. Repair exhaust system. Refer to pertinent vehicle Technical Manual, Appendix A. Remove engine exhaust manifold (table 5- 5). Repair exhaust manifolds. Install exhaust manifolds (table 7-9). e. Refer to 4, above, for corrective action. a. Refer to para 3-8 for corrective action. b. Replace coupling. Refer to table 4-1 for replacement instructions. c. Refer to 2g, above, for corrective action. d. Disassemble engine (chapter 5) and inspect. Replace damaged parts. Assemble engine (chapter 7). a. Check electrical lead. Refer to 2g, above, for corrective action. b. Refer to 2g, above, for corrective action. 3-6