TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks
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MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION ENGINE CRANKS BUT WILL NOT START IN COLD WEATHER (FUEL SYSTEM OPERATING PROPERLY) (Contd) WARNING Diesel fuel is flammable. Do not perform troubleshooting checks near open flame, sparks, or electricity. Injury or death to personnel may result. NOTE • Have a drainage container ready to catch fuel. • During steps 3 and 4, do not confuse in-tank fuel pump pressure with manifold heater pump pressure. 3. Disconnect fuel line at fuel nozzle, energize manifold heater circuit, and check to see if fuel is discharged. 4. Check fuel nozzle for proper operation. 1. If fuel is not discharged, replace manifold heater fuel pump (WP 0065 00 or WP 0066 00). 2. Remove fuel return lines (WP 0062 00). Energize circuit and check to see if fuel is discharged. If fuel is not discharged, replace manifold heater (WP 0065 00 or WP 0066 00). Replace damaged fuel nozzle. (WP 0067 00). TM 9-2320-361-24-1 0006 00 0006 00-9 MECHANICAL SYSTEMS TROUBLESHOOTING - UNIT (Contd) Table 3. Manifold Heater System Troubleshooting Procedures (Contd). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 1. ENGINE TEMPERATURE GAUGE ABOVE 230 °F (110 °C) WARNING Use caution when removing radiator filler cap. Steam or hot coolant under pressure may cause injury to personnel. 1. Ensure engine fuel supply grade is correct for vehicle use and climatic conditions (TM 9-2320-361-10). 2. Check coolant protection level with antifreeze tester. 3. Check engine temperature gauge and engine temperature sending unit (WP 0014 00, table 1, malfunction 2). If fuel grade is incorrect, completely drain fuel system and replace fuel with correct grade (TM 9-2320-361-10). If coolant is not within a safe range, service cooling system (WP 0076 00). 1. If engine temperature gauge is defective, replace (WP 0095 00). 2. If engine temperature sending unit is defective, replace (WP 0107 00). Table 4. Cooling System Troubleshooting Procedures.