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MIL-T-62097C
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 vehicle 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 six cylinders. Engine net horsepower ratings 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 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 conditions. 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 produce the required vehicle performance when operated
on unleaded fuel with a research octane rating of 91, at an engine speed 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. Net
horsepower ratings used in performance calculations shall be determined in accordance with
SAE J1349. Unless otherwise 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 or combination full flow and bypass oil filter with
replacement element 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 maximum 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 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 (F). The cooling system shall include a surge tank or a coolant recovery reservoir of
not less than two-quart capacity. For cooling system servicing, see 3.4.28.1.
*
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.
9

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