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

5. Excess engine power: 6. Engine overspeeds beyond 2640 rpm at on load: 7. Engine will not idle, but runs well under load. 8. Engine smokes: (a) White or grey smoke indicating unburned fuel. 3-4 Probable Cause e. Improper fuel injection pump operating lever travel or engine linkage adjustment. f. One or more cylinders not firing. g. h. j. k. Fuel injector nozzles not func- tioning properly. Fuel injection pump not properly timed. Low cylinder compression. (Worn piston rings or burned valves.) Failed turbosupercharger. (in checking for a failed tur- bosupercharger, a quick check should be made to see that tur- bosupercharger vanes turn freely. Vanes which have excessive drag will have low output.) Leaking engine exhauet system causing reduced pressure to turbosuperchargers. l. Fuel injection pump advance unit not functioning properly. a. Cooling fans not operating. b. Improper fuel injection pump high idle screw or bridge setting. c. Improper fuel injection pump timing. Fuel injection pump governor not properly adjusted. a. b. c. d. e. Some cylinders not firing (low ambient temperatures). Improper adjustment of engine idle screw or linkage sticking. Fuel injector nozzles not func- tioning properly. Fuel injection pump governor not properly adjusted. Fuel injection pump not func- tioning properly. a. Engine cylinders and intake air too cold for efficient combustion. Corrective Action e. Adjust fuel injection pump linkage to get complete travel. Refer to TM 9-2910-212- 34 for procedures on adjusting pump and figures 4-84 and 4-85 for adjustment of linkage. f. Refer to item 3, above, for corrective action. g. Time fuel injection pump (para 4-4). Also refer to TM 9-2910-212-34. h. Check valve clearance (para 4-23). Check j. k. l. cylinder compression (para 4-22) and take appropriate corrective action tabulated in item 2h, above. Remove turbosupercharger (Table 5-1). Overhaul turbosupercharger, refer to TM 9- 2990-200-34. Install serviceable tur- bosupercharger (para 7-17b). 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). Remove rear fan and accessory drive housing assembly (table 5-8). Rebuild fuel injection pump advance unit (table 6-29). Install rear fan and accessory drive housing assembly (table 7-5). a. Refer to paragraph 3-10 for corrective action. b. Adjust fuel injection pump high idle screw. Refer to TM 9-2910-212-34 for procedures. c. Time fuel injection pump (para 4-4). Also refer to TM 9-2910-212-34. Adjust fuel injection pump governor. Refer to TM 9-2910-212-34 for procedures. a. Operate engine at part load to increase cylinder head temperature or use intake manifold heater. b. Reset idle screw and check for sticking linkage. c. Remove fuel injector nozzles. Refer to table 4-7 for references on removing, repairing, checking, and installing nozzle and holder assembly. d. Adjust fuel injection pump governor. Refer to TM 9-2910-212-34 for procedures. e. Remove fuel injection pump (table 4-1). Overhaul fuel injection pump. Refer to TM 9-2910-212-34 for instructions. Install injection pumP (table 4-1). a. Operate engine under load to increase cylinder head temperatures. Increase idle speed, use manifold heater.