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 3. Engine runs rough, one or more cylinders not fiiing: 4. Engine low on power, stall speed below normal of 1850 to 1950 rpm: Probable Cause f. Fuel injection pump not properly timed. (Initial engine starting. ) g. Failed fuel injection pump. h. Fuel injection pump fails to turn when engine is cranking or turned by hand. i. Low cylinder compression. a. b. c. d. e. f. g. Engine operating at below normal temperature. Water in fuel, dirty fuel, or restricted fuel filters. Leaking or failed fuel injector tubes. Improper valve adjustment. Fuel injector nozzles dribbling or not functioning properly. Fuel injection pump not func- tioning properly. Low compression on one or more cylinders. a. Improper fuel being used or inadequate fuel delivery to engine. b. Restricted fuel filters or lines. c. Faulty fuel pump assembly. d. Engine overheated. Corrective Action f. Time fuel injection pump (para 4-4). Also refer to TM 9-2910-212-34. g. Remove fuel injection pump (para 4-4). Install new fuel injection pump (para 4-4). h. Disassemble engine (chapter 5 ) and replace defective parts. Assemble engine (chapter 7). i. Check valve clearance (para 4-23) and make cylinder compression check (para 4-22 ) and take appropriate corrective action as noted below: 1. Worn piston rings Remove cylinders (para 5-1 2) and replace worn piston rings (para 6-23 through 6- 27). Install pistons and cylinders (para 7- 8a). 2. Leaking valves Remove cylinders ( para 5-1 2) and repair leaking valves (para 6-33a). Install pistons and cylinders (para 7-8a). a. b. c. d. e. f. g. Check oil cooler thermostat (para 6- 47d(2)). Operate engine at higher rpm. Check fuel filters for water, dirt, and ob structions. Refer to pertinent vehicle Technical Manual, Appendix A. If clean, replace fuel pump (para 4-4). Tighten or remove leaking fuel injector tubes (Table 5-5). Install fuel injector tubes (Table 5-5). Check and reset valve clearance (para 4- 23). Check and clean fuel filter elements. Refer to pertinent vehicle Technical Manual, Appendix A. Remove fuel injector nozzle and overhaul nozzle and holder assembly (Table 4-7). Remove fuel injection pump (Table 4-1). Install fuel injection pump (Table 4-1). Inspect fuel filters for dirt and service if necessary. Refer to b, above. Refer to item 2j, above, for corrective ac- tion. a. Drain fuel tanks and fill with proper specification fuel. Refer to pertinent vehicle Technical Manual, Appendix A for proper fuel. Refer to fuel system troubleshooting, paragraph 3-8. b. Clean filters and fuel lines and remove restrictions. Refer to pertinent vehicle Technical Manual, Appendix A. c. Replace fuel pump assembly (para 4-4). d. Refer to cooling system troubleshooting, paragraph 3-10. 3-3