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|  MIL-T-62320C
accordance with SAE J1349. The engine shall demonstrate the performance characteristic
specified herein when using diesel fuel conforming to VV-F-800. In addition, when specified
(see 6.2), the engine shall operate satisfactorily on grade JP-4 and grade JP-5 fuel conforming to
MIL-T-5624 under emergency, short duration conditions and on grade JP-8 fuel conforming to
MIL-T-83133 under normal condition. A power loss when operating on JP-4, JP-5 or JP-8 is
acceptable.
* 3.4.1.2 Gasoline engine. When specified (see 6.2), the vehicle shall be equipped with a
liquid cooled, internal combustion, four-stroke cycle gasoline engine with not less than six
cylinders. The engine furnished shall provide the required vehicle performance when operated
on unleaded fuel with a research octane rating of 91, at an engine speed of not more than the
manufacturer's recommended operating speed. The engine shall be capable of warranted
operation on unleaded fuel when used in accordance with the operator's manual. Engine net
horsepower used in performance prediction calculations shall be determined in accordance with
SAE J1349. Unless otherwise specified or required by foreign laws, vehicles for overseas use
shall be capable of accepting and operating on leaded gasoline.
3.4.1.3 Oil filter. A full-flow type oil filter shall be furnished.
3.4.1.4 Governor. An engine governor shall be furnished and set and sealed to limit the
engine to maximum recommended operating speed.
* 3.1.1.5 Cooling. The cooling system shall maintain engine coolant at a temperature below
the boiling point with the vehicle loaded to rated GVW and operated at an altitude of 10,000 feet
above sea level or in an ambient air temperature of not lees than 125 degrees Fahrenheit (oF).
The cooling system shall include a surge tank or a coolant recovery reservoir of not less than
two-quart capacity. On tilt cab vehicles, a radiator servicing access door shall be provided to
allow verification of coolant level.
* 3.4.1.6 Coolant temperature control. Thermostatic control of engine coolant temperature
shall be provided. On diesel engine driven vehicles, the control shall include complete
thermostatic control of all coolant flow through the radiator.
* 3.4.17 Fan clutch. A fan clutch shall be provided. The fan clutch shall reduce the fan speed
automatically when the fan is not required for engine cooling. The fan clutch shall be asbestos
free.
* 3.4.1.8 Power plant heaters and fuel warmer. When specified (see 6.2), a coolant heater, an
engine oil heater, and a fuel warmer (diesel engine driven vehicles only) shall be provided.
Unless otherwise specified (see 6.2), a battery heater shall be provided when power plant heaters
are specified. Heaters shall operate on 120-volt alternating current (ac) and shall be wired
through a junction block, including fuse or circuit breaker, to a single, three-pronged (male),
10
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