TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 1 Download
Page 678 of 1205
2. Fill system with proper antifreeze solution. See table 3-1 for preparation of antifreeze solutions. 3. Secure filler cap (1) to surge tank (2). 4. Run engine at fast idle (approximately 1,500 rpm) until engine temperature reaches 190°F (88°C), opening thermostat to circulate coolant. 5. Depressurize system (see task a.). 6. Fill with proper antifreeze solution until surge tank (2) is 3/4 full. See table 3-1 for preparation of antifreeze solutions. 7. Secure filler cap (1) to surge tank (2). 8. Run engine at fast idle (approximately 1,500 rpm) until temperature reaches 190°F (88°C), opening thermostat, and stop engine. 9. Depressurize system (see task a.). Use tester to ensure proper coolant protection is provided. 10. Secure filler cap (1) to surge tank (2). 3-61. COOLING SYSTEM SERVICING (Cont'd) TM 9-2320-387-24-1 Change 1 3-111 FOLLOW-ON TASKS: • Start engine (TM 9-2320-387-10) and check cooling system for leaks. • Lower and secure hood (TM 9-2320-387-10). ETHYLENE-GLYCOL INHIBITED MIL-A-46153 LOWEST EXPECTED AMBIENT TEMPERATURE PINTS PER GALLON OF COOLANT CAPACITY ARCTIC GRADE ANTIFREEZE -90°F (-68°C) MIL-A-11755 CAUTION Freezing point of -90°F (-68°C). Issued ready for use and must not be mixed with any other liquid. °F °C +20 -7 1-1/2 (.71 L) +10 -12 2 (.95 L) 0 -18 2-3/4 (1.3 L) -10 -23 3-1/4 (1.5 L) -20 -29 3-1/2 (1.7 L) -30 -34 4 (1.9 L) -40 -40 4-1/4 (2.0 L) -50 -46 4-1/2 (2.1 L) -55 -48 4-3/4 (2.2 L) Below -60 Below -51.1 Use arctic grade antifreeze -90°F (-68°C) Table 3-1. Guide for Preparation of Antifreeze Solutions. 4 3 1 2