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MIL-T-62223B(AT)
vehicle, loaded to required 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 meet or exceed the requirements of this
specification.
3.4.1.1 Diesel engine. Unless otherwise specified (see 3.4.1.2), the engine shall be a
liquid cooled, compression ignition, two-stroke or four-stroke cycle diesel type, with not less
than four cylinders. Engine net horsepower used in performance prediction calculations shall be
determined in accordance with SAE J816 or SAE J1349. A fan clutch shall be provided. The
fan clutch shall reduce the fan speed automatically when the fan is not required for cooling.
3.4.1.2 Gasoline engine. When specified (see 6.2), the engine shall be a liquid cooled,
internal combustion, four-stroke cycle, gasoline type, with not less than six cylinders. The
engine shall produce the required vehicle performance when operated on unleaded fuel with a
research octane rating of 91, at 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. Engine net horsepower figures used in
performance prediction calculations shall be determined in accordance with SAE J245 or
SAE J1349. A fan clutch shall be provided. The fan clutch shall reduce the fan speed
automatically when the fan is not required for cooling.
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 engine manufacturer's maximum recommended operating speed.
3.4.1.5 Coolant temperature control. Thermostatic control of engine coolant temperature
shall be provided. For diesel engine driven vehicles, control shall be provided. For diesel engine
driven vehicles, control shall include partial thermostatic control of coolant flow through the
radiator shutters, or complete thermostatic control of all coolant flow through the radiator.
3.4.2 Electrical systems. The electrical system shall be in accordance with Federal
Motor Carrier Safety Regulations 393.27 through 393.31 and 393.33.
7

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