MIL-PRF-62321D
3.3.2 Service brakes. The service brakes shall control and hold the vehicle, when
loaded to its specified GVW, on a 20 percent grade. The service brakes shall stop the
vehicle, loaded to the specified GVW, within the stopping distance requirements of Federal
Motor Carrier Safety Regulation, Title 49, section 393.52 (see 4.1.3).
3.4 Chassis components.
3.4.1 Engine. The engine furnished for the specified vehicle shall be the chassis
manufacturer's standard or optional engine for the commercial model truck which meets or
exceeds the requirements of this specification.
3.4.1.1 Diesel engine. Unless otherwise specified (see 3.4.1.2), the vehicle shall be
equipped with a liquid cooled, compression ignition, two-stroke or four-stroke cycle diesel
engine, with not less than four cylinders. Engine net horsepower used in performance
predictions shall be determined in accordance with SAE J1349. The engine shall demonstrate
the performance characteristics specified herein when using diesel fuel conforming to
A-A-52557. In addition, when specified (see 6.2), the engine shall operate satisfactorily on
grade JP-8 fuel under normal conditions (see 6.3). A power loss when operating on JP-8 is
acceptable.
3.4.1.2 Gasoline engine. When specified for 4x2 and 4x4 model vehicles (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 produce 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
predictions 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 the engine manufacturer's recommended operating speed.
3.4.1.5 Cooling system. The cooling system shall maintain the 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 less than
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