TM-9-2320-387-10 HMMWV Operator Manual Download
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Table 1-5. Cooling System Data. Surge tank cap pressure .............................. 15 psi (103 kPa) Thermostat: Starts to open ...................................... 190°F (88°C) Fully open ........................................ 212°F (100°C) Radiator .......................................... Downflow type Fan ....................................... 10 blade, 19 in. (48 cm) Normal operating coolant temperature .............. 190°-230°F (88°-110°C) TM 9-2320-387-10 1-8 Type ........................ 6.5 liter diesel, turbocharged, liquid-cooled Cylinders ................................................. 8(V) Brake horsepower ......................... 190 horsepower @ 3,400 rpm Idle speed (engine rpm) ................................. 700 ± 25 rpm Operating speed (engine rpm) .......................... 1,500-2,300 rpm Oil pressure at idle .................................. 20 psi (138 kPa) Normal operating oil pressure .................... 40-50 psi (276-345 kPa) Table 1-4. Engine Data. Table 1-6. Transmission Data. General Information Model .............................. Turbo Hydra-Matic 4L80-E Type................................... Four-speed automatic Oil type ....................................... Dexron ® III Transmission Range Selection Recommended Shift Lever Position Operating Condition P (park) Vehicle stopped with parking brake applied. R (reverse) Clear of traffic and obstructions, using ground guide. N (neutral) Vehicle stopped with parking brake applied. (overdrive) Normal driving and fording. D (drive) Hilly terrain and towing a trailer. 2 (second) Hill climbing and engine braking to slow vehicle when descending steep hills. 1 (first) Maximum engine braking when descending very steep hills, climbing steep hills, or driving through deep mud, sand, or snow. D 1-12. TABULATED DATA (Cont’d)