TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 2 Download
Page 131 of 953
TM 9-2320-280-20-2 3-60. COOLING SYSTEM SERVICING (Cont’d) 3. 4. 5. 6. 7. 8. 9. 10. Secure filler cap (1) to surge tank (2). Run engine at fast idle (approximately 1500 rpm) until engine temperature reaches 190°F (88°C), opening thermostat to circulate coolant. Depressurize system (see a. of this task). Fill with proper antifreeze solution until surge tank (2) is 3/4 full. See table 3-1 for preparation of antifreeze solutions. Secure filler cap (1) to surge tank (2). Run engine at fast idle (approximately 1500 rpm) until temperature reaches 190°F (88°C), opening thermostat, and stop engine. Depressurize system (see task a. of this paragraph). Use tester to ensure proper coolant protection is provided. Secure filler cap (1) to surge tank (2). Table 3-1. Guide for Preparation of Antifreeze Solutions. ETHYLENE-GLYCOL INHIBITED MIL-A-46153 LOWEST EXPECTED AMBIENT PINTS PER GAUON ARCTIC GRADE ANTIFREEZE TEMPERATURE OF COOLANT -90°F (-67.7°C) CAPACITY MlL-A-11755 °F °C +20 -6.7 1-1/2 +10 -12.2 2 CAUTION 0 -17.7 2-3/4 -10 -23.3 3-1/4 Freezing point of -90°F (-67.7°C). -20 -28.8 3-1/2 Issued ready for use and must -30 -34.4 4 not be mixed with any other liquid. -40 -40.0 4-1/4 -50 -45.5 4-1/2 -55 -48.3 4-3/4 Below -60 Below -51.1 Use arctic grade antifreeze -90°F (-67.7°C) FOLLOW-ON TASKS: Start engine (TM 9-2320-280-10) and check cooling system for leaks. Lower and secure hood (TM 9-2320-280-10). 3-109