TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 1 Download
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TM 9-2320-387-24-l h-6 1. COOLING SYSTEM SERVICING I This task covers: a. Depressurizing b. Draining System c. Preventive Cleaning d. Filling System INITIAL SETUP: Tools ?&era1 mechanic’s tool kit: automotive (Appendix B, Item 1) Maintenance and repair shop equipment: automotive (Appendix B, Item 2) Test Equipment Radiator tester (Appendix B, Item 49) Materials/Parts Antifreeze (Appendix C, Item 15) Manual References TM 9-2320-387-10 TM 9-2320-387-24P Manual References (Cont’d) TM 750-254 TB 750-651 Equipment Condition Hood raised and secured (TM 9-2320-387-10). General Safety Instructions Do not remove surge tank filler cap before releasing internal pressure. MaintenanceLevel Unit a. Depressurizing WARNING Do not remove surge tank filler cap before depressurizing system when engine temperature is above 190°F (88°C). Steam or hot coolant under pressure may cause severe bums. 1. If engine is hot, remove surge tank filler cap (1) by placing a thick cloth over cap (1). Press down and turn counterclockwise to its first stop to release internal pressure. 2. After pressure has escaped, press down and turn cap (1) counterclockwise again and remove. b. Draining System 1. If engine is hot, depressurize system (see task a.). NOTE Have draidage container ready to catch coolant. 2. Open drainvalve (4) and allow system to drain. 3. Close drainvalve (4). c. Preventive Cleaning 1. For preventive cleaning, refer to TB 750-651. 2. Test surge tank filler cap (1); refer to TM 750-234. d. Filling System NOTE The cooling system for the vehicles covered in this manual has a 26 qt (24.6 L) capacity. Continue filling and allow air to escape. Ensure surge tank coolant level is 3/4 full before securing filler cap. 1. Ensure radiator drainvalve (4) is closed and heater control valve (3) is open (pull TEMP knob on dash to MAX position). 3-110