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|  MIL-T-12407X(AT)
horsepower 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 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). A coolant level indicator consisting of an unbreakable translucent
reservoir shall be provided in a position readily visible for checking the coolant level. The
translucent reservoir shall be part of the coolant recovery system. The cooling system shall be of
sufficient capacity to permit idling the engine (including high idle at full air conditioning load) in
an ambient temperature of 95F, for a period of not less than one half hour without overheating.
*
3.4.1.5 Coolant temperature controls. Thermostatic control of engine coolant
temperature shall be provided. On diesel engine driven vehicles, the control shall include
complete thermostatic control of all coolant flow through the radiator.
*
3.4.1.6 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 clutch lining shall be
asbestos free.
*
3.4.1.7 Power plant heaters and fuel warmers. When specified (see 6.2), a coolant heater,
an engine oil 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. Heaters shall operate on 110-volt alternating current (ac), shall be wired through a
junction block, including 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. 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). Electrical insulation of connecting cable shall withstand normal
operating stresses in low ambient air temperatures (down to minus 60F) without cracking or loss
of dielectric capacity. All heater lead wires shall be installed without interfering with vehicle
component operation and without loose excess wire. Provisions for stowage of the cable shall be
provided in the vehicle cab. Heaters shall be furnished as follows:
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