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|  MIL-T-45380E(AT)
Maximum geared speed (mph) =
Governed speed (rpm)
Total gear reduction x tire factor
3.3.2 Service brakes. The service brakes shall control and hold the vehicle when loaded
to its specified GVW, on a 30 percent grade. The service brakes shall stop the vehicle, loaded to
specified GVW, within the stopping distance requirements of Federal Motor Carrier Safety
Regulation 393.52.
3.4 Chassis components.
3.4.1 Engine. The engine furnished 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 prediction
calculations shall be determined in accordance with SAE J1349. The engine shall demonstrate
the performance characteristics 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-B fuel conforming to MIL-T-83133 under normal conditions. A power loss when
operating on JP-4, JP-5 or JP-B is acceptable.
*
3.4.1.2 Oil filter. A full flow or combination full flow and bypass oil filter with
replacement element shall be furnished.
3.4.1.3 Governor. An engine governor shall be furnished and set and sealed to limit the
engine to the maximum recommended operating speed.
*
3.4.1.4 Cooling system. The cooling system shall maintain the engine coolant at a
temperature below the boiling point with the vehicle loaded to GVW and operated at an altitude
of 10,000 feet above sea level or in an ambient air temperature of not less than 125 degrees
Fahrenheit (oF). The coolant system shall include a surge tank or a coolant recovery reservoir of
not less than two-quart capacity.
*
3.4.1.5 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.
*
3.4.1.6 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.
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