TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks
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TM 9-2320-361-24-1 0006 00 MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 1. ENGINE TEMPERATURE GAUGE ABOVE 230 °F (110 °C) (Contd) 4. Inspect drivebelts for damage and check belt tension. 5. Inspect fan for broken or missing blades. 6. Inspect radiator for bent fins. 7. Start engine. Remove radiator cap and visually check coolant for proper circulation and milky film. 8. Check for clogged or broken radiator (TM 750-254). 9. Check operation of temperature gauge (WP 0014 00, table 1, malfunction 2). Replace any damaged parts and adjust drivebelts (WP 0084 00). If blades are broken or missing, replace fan (WP 0075 00). Straighten bent fins, or replace radiator (WP 0077 00). 1. If coolant is not circulating properly, stop engine, remove thermostat, and test or replace (WP 0081 00). 2. If milky film is present, check cylinder head and gaskets for defects (WP 0027 00). For cleaning and flushing instructions, refer to TB 750-651 Replace damaged temperature gauge (WP 0095 00). 2. ENGINE DOES NOT REACH NORMAL OPERATING TEMPERATURE 1. Start engine. Remove radiator cap and visually check coolant for proper circulation. Stop engine. 2. Test coolant temperature gauge, sending unit, and electrical circuits (WP 0014 00, table 1, malfunction 2). If coolant is circulating below 100 °F, remove and test thermostat. Replace if defective (WP 0081 00). Replace damaged components. 3. COOLANT LOSS DURING NORMAL OPERATION 1. Pressurize cooling system and check for leaks. 2. Check radiator cap for proper relief pressure (TM 750-254). 3. Check for coolant in oil. 1. Tighten loose clamps, fasteners, or fittings. 2. Replace leaking hoses and/or water pump (WP 0078 00 or WP 0082 00). Relief pressure should be 15 psi (103 kPa). Replace radiator cap if defective. If coolant is found in oil, check cylinder head and gaskets for defects (WP 0027 00). 0006 00-10 MECHANICAL SYSTEMS TROUBLESHOOTING - UNIT (Contd) Table 4. Cooling System Troubleshooting Procedures (Contd).