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|  MIL-T-46765(AT)
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. 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 supplied with a
liquid cooled, internal combustion, four-stroke cycle gasoline engine. The engine furnished shall
provide 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 continuous, warranted operation on unleaded fuel. Engine net
power figures used in performance prediction calculations shall be determined in accordance
with SAE J1349.
* 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. 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 specified 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)). 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 verification of the
coolant level. For cooling system servicing, see 3.4.25.1.
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