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 c. Obstructed oil cooler core c. Remove oil coolers (table 5-2) and remove passages. obstructions from oil cooler core passages (table 6-37). Install oil coolers (table 7-12). d. Low engine oil pressure. d. Refer to para 3-9, above, for corrective action. e. Damaged baffles or deflectors. e. Refer to para 3-9, 4a. f. Plugged baffles and air deflectors. f. Remove engine (chapter 5) and clean thoroughly. Replace engine (chapter 7). 3. Engine fails to reach normal a. Engine warm-up rpm too low for a. Increase engine warm-up speed from 1100 operating temperature. prevailing temperature. rpm to 1400 rpm. b. Damaged baffles or deflectors. b. Refer to 2e, above, for corrective action. 3-11. Troubleshooting Intake Manifold Flame Heater Fuel System 1. No fuel to intake manifold flame heater. 2. Fuel to intake manifold, but flame heater will not ignite fuel. 3. Intake manifold heater on one side of engine fails to operate. a. Purge pump inoperative. b. Flame heater fuel filter plugged. c. Fuel inlet solenoid valve not operating due to electrical or mechanical failure. d. Manifold heater spray nozzle restricted or plugged. e. Restricted or plugged fuel supply tubes. f. Fuel check valve inoperative. a. Insufficient air for combustion in chamber. b. No electrical current to ignition unit. c. Spark plug not operating. d. Electrical lead to ignition unit damaged. e. Improper heater spray nozzle pattern. a. Electrical lead to ignition unit damaged, unit defective or spark plug not operating. b. Spray nozzle line plugged or damaged. c. Spray nozzle plugged. a. b. c. d. e. f. — Refer to pertinent vehicle Technical Manual, Appendix A, for corrective action. Remove filter and clean or replace element (table 6-44). Remove fuel inlet solenoid valve (table 5-3). Replace damaged or inoperative valve. Install solenoid valve (table 7-11). Remove, overhaul, and install manifold heater (table 6-40). Clean tubes. Remove fuel check valve. a. Always crank engine as heater is operated. b. Refer to pertinent vehicle Technical Manual, Appendix A, for corrective action. c. Replace spark plug (table 6-40). d. Remove electrical lead and install new electrical lead (table 6-44). e. Replace heater spray nozzle (table 6-40). a. Remove electrical lead or unit and install new lead or unit (table 6-44). b. Remove and replace line (table 6-40). c. Remove and replace nozzle (table 6-40). 3-11