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|  MIL-T-62246B(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, with
not less than four cylinders. Engine net horsepower used in performance prediction calculations
shall be determined in accordance with SAE J1349.
* 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. Net horsepower used in performance prediction calculations shall be determined in
accordance with SAE J1349. 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.
3.4.1.3 Oil filter. A full flow type oil filter 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 rated 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. A high coolant level alarm buzzer and a red
indicator warning light shall be provided on the instrument panel. On tilt cab models, a radiator
servicing access door shall be provided to allow verification of the coolant level.
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