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

Malfunction 4. Excessive exhaust smoke. 3-9. Troubleshooting Lubricating System 1. Low engine oil pressure. 2. High engine oil pressure. Probable Cause e. Improperly adjusted fuel injection pump. f. Fuel bleeder valve in injection pump not functioning properly. a. b. c. d. e. Fuel injection pump improperly adjusted causing excessive fuel delivery. Fuel injector nozzle and holder assemblies not functioning properly. Nozzles dripping or nozzle holder spring broken. Turbosupercharger failed or restricted induction system. Fuel injection pump not properly timed. Worn or scored pistons, cylinder, or rings. a. b. c. d. e. Improper grade oil for prevailing temperature. Engine idle speed too low. Insufficient oil in oil pan. Engine oil pressure sending unit not functioning properly. High engine oil temperature or diluted oil. f. Oil pressure regulator valve not operating properly. g. Oil filters partially obstructed. h. Crankcase oil passages obstructed. j. Oil pump pickup tube screen obstructed. k. Oil pump not functioning properly. l. Engine bearings worn. a. b. Oil pressure sending functioning properly. Oil pressure regulator functioning properly. unit not valve not Corrective Action e. Adjust fuel injection pump. Refer to TM 9- 2910-212-34 for procedures. f. Remove fuel injection pump (table 4-1). Refer to TM 9-2910-212-34 for overhaul procedures. Install fuel injection pump (table 4-1). a. Adjust fuel injection pump. Refer to TM 9- 2910-212-34 for procedures. b. Refer to item 2c, above, for corrective action. c. Refer to para 3-7, above, for troubleshooting procedures. d. Time fuel injection pump (table 4-1). Also refer to TM 9-2910-212-34. e. Remove cylinders and pistons (table 5-9) and replace defective parts (tables 6-12 and 6-14). Install pistons and cylinders (table 5- 9). a. b. c. d. e. Drain oil pan and refill with proper grade oil for prevailing temperature. Refer to pertinent vehicle Technical Manual, Ap pendix A. Check engine idle speed and reset to 700 to 750 rpm. Fill oil pan to proper level. Refer to per- tinent vehicle Technical Manual, Appendix A. Remove oil pressure sending unit (table 5- 10). Install new unit (table 5-10). Refer to 4, below, for corrective action. f. Remove oil pressure regulator valve (table 4- 2). Replace damaged parts (para 6-38d). Install oil pressure regulator valve (table 4- 2). g. Refer to pertinent vehicle Technical Manual, Appendix A for service procedures. h. Disassemble engine (chapter 5). Clean oil passages (para 6-9c). Assemble engine (chapter 7). j. Remove oil pan (table 4-5). Clean ob- structions from pickup tube screen. Install oil pan, (table 4-5). k. Remove oil pan (table 4-5). Remove oil pump (table 5-10). Rebuild oil pump (table 6-17). Install oil pan (table 4-5). l. Disassemble engine (chapter 5). Replace worn bearings and necessary parts. Assemble engine (chapter 7). a. Refer to 1d, above, for corrective action. b. Refer to 1f, above, for corrective action. 3-9