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|  MIL-T-11663K
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 within the
stopping distance requirements of Federal Motor Carrier Safety Regulation 393.52, under all
conditions of loading, up to the specified GVW.
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. 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 on class A and class B trucks and not less than six cylinders on class C and
class D trucks. Engine net horsepower used in performance prediction calculations shall be
determined in accordance with SAE J1349.
* 3.4.1.2 Gasoline. 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 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. Net horsepower figures 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 type oil filter shall be furnished.
3.4.1.4 Cooling system. The cooling system shall maintain engine coolant at a temperature
below the boiling point with the vehicle loaded to the 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 coolant system shall include a surge tank or a coolant recovery reservoir of
not less than two-quart capacity. A high coolant temperature or low coolant level alarm buzzer
and a red indicator warning light shall be provided on the dash 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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