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|  MIL-T-62145E
* 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, a motor rating of 83 and an average octane rating of 87
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
operators manual. Unless otherwise specified or required by foreign laws, vehicles for overseas
use shall be capable of accepting and operating on leaded gasoline. Engine net horsepower
figures used in performance prediction calculations shall be determined in accordance with
SAE J1349.
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 Cooling system. The cooling system shall maintain engine coolant at a temperature
below the boiling point with the vehicle loaded 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. On tilt cab models, a radiator servicing access door shall be provided to
allow ready verification of coolant level.
* 3.4.1.6 Coolant temperature control. Thermostatic control of engine coolant temperature
shall be provided. For diesel driven vehicles, the control shall include complete thermostatic
control of all coolant flow through the radiator.
* 3.4.1.7 Fan clutch. A fan clutch shall be provided. The fan clutch shall reduce the fan speed
automatically when the fan is not required for engine cooling. The fan clutch shall be asbestos
free.
3.4.1.8 Power plant heaters and fuel warmer. When specified (see 6.2), a coolant heater, an
engine oil heater, a hydraulic fluid reservoir heater, and a fuel warmer (diesel engine driven
vehicles only) shall be provided. Unless otherwise specified (see 6.2), a battery heater shall be
provided when power plant heaters are specified. The heaters shall operate on 110-volt
alternating current (ac), and shall be wired through a junction block, including a fuse or circuit
breaker, to a single three-pronged (male), weatherproof, slave receptacle for receiving external
power and 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.
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