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|  MIL-T-62498
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 meets or exceeds the requirements of this
specification.
3.4.1.1 Diesel engine. The vehicle shall be equipped with a liquid cooled, compression
ignition, two-stroke or four-stroke cycle diesel engine, with not less than eight 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 engine cooling.
3.4.1.2 Oil filter. A full flow type oil filter shall be furnished.
3.4.1.3 Governor. An engine governor shall be furnished and set to limit the maximum
engine speed to the engine manufacturer's maximum recommended operating speed. The
governor shall also provide an adjustable no-load speed setting which shall be maintained within
100 revolutions per minute (rpm) of the selected setting during the compaction cycle.
3.4.1.4 Coolant temperature control. Thermostatic control of engine coolant temperature
shall be provided. The control shall include partial thermostatic control of coolant flow through
the radiator and thermostatically controlled radiator shutters or complete thermostatic control of
all coolant flow through the radiator.
3.4.1.5 Power plant heaters and fuel warmer. When specified (see 6.2), a coolant heater;
an engine oil heater; and a fuel warmer shall be provided. Unless otherwise specified (see 6.2), a
battery heater shall be provided when power plant heaters are specified. All heaters shall operate
on 110-volt alternating current (ac), and shall be wired through a junction block to a single
three-pronged (male), weatherproof, slave receptacle for receiving external power and for
grounding the vehicle. A three-wire connecting cable, 25 feet long and of adequate line capacity
to supply power for all heater units simultaneously, shall be furnished. The connecting cable
shall include a matching female connector at the vehicle end and a standard, weatherproof,
three-pronged (two power plus one ground) male connector at the other end. Electrical apparatus
shall conform to Federal Motor Carrier Safety Regulation 393.77(c)(7). The electrical insulation
8
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