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|  MIL-T-62021E(AT)
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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.
Engine net power used in performance prediction calculations shall be determined in 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 conditions. A power loss when operating on JP-4, JP-5 or JP-8 is acceptable.
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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. 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 manufacturer's recommended operating speed.
The engine shall be capable of continuous, warranted operation on unleaded fuel, when used in
accordance with the operator's manual. Net power used in performance prediction calculations
shall be determined in accordance with SAE J1349.
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3.4.1.3 Oil filter. A full flow or combination full flow and bypass type oil filter with
replaceable 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.
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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
3050 meters (m) (10,000 feet) above sea level or in an ambient air temperature of not less than
52 Celsius (C) (125 degrees Fahrenheit (F)). A coolant level indicator consisting of an
unbreakable translucent reservoir shall be provided in a position readily visible for checking the
coolant level. The translucent reservoir shall be part of the coolant recovery system. The cooling
system shall be of sufficient capacity to permit idling the engine (including high idle at full air
conditioning load) in an ambient temperature of 35C (95F), for a period of not less than one half
hour without overheating. For cooling system servicing, see 3.4.24.1.
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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.
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