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|  MIL-T-62491C
3.4 Chassis components.
3.4.1 Engine. The engine furnished for the specified vehicle class 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. Engine
net power 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-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. 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 power 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 or combination full flow and bypass oil filter with replaceable
element shall be furnished.
3.4.1.4 Governor. Except for class 10 wreckers, an engine governor shall be furnished, 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 engine coolant at a temperature
below the boiling point with the vehicle loaded and operated at an altitude of 3050 mm
(10,000 feet) above sea level or in an ambient air temperature of not less than 52 Celsius (C)
(125 degrees Fahrenheit (F)). The coolant system shall include a surge tank or a coolant
recovery reservoir of not less than 1.89 liters (L) (two-quart) capacity. On tilt cab models, a
radiator servicing access door shall be provided to allow ready verification of coolant level. For
cooling system servicing, see 3.4.28.1.
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