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|  MIL-T-12407X(AT)
(a) Coolant heater, 1500-watt minimum rating, shall be installed in the engine block or in
the lower coolant inlet hose. Engine thermostat with an operating range of 170F to
195F shall be installed
(b) Immersion type engine oil heater, 300-watt minimum rating, with 170F to 195F
thermostat, shall be installed in oil pan through any convenient opening
(c) Battery heater shall have a capacity adequate to maintain the battery electrolyte at a
temperature of not less than l0F during vehicle exposure in ambient air temperatures
as low as minus 60F, and shall embody a thermostat to-limit the temperature of the
electrolyte to not more than 80F
(d) A fuel warmer or preheater shall be provided on diesel engine driven vehicles to
prevent clogging of fuel filters due to wax crystallization in the fuel. The fuel warmer
shall use engine coolant to transfer sufficient heat to the diesel fuel to heat it from an
inlet temperature of minus 40F to an outlet temperature of plus 9F, with a flow rate
of not less than the maximum fuel demand of the engine fuel system. A coolant
shutoff valve shall be provided for the coolant inlet side of the fuel warmer unit.
*
3.4.1.8 Fuel fired engine preheater. When specified (see 6.2), for diesel engine driven
vehicles, a diesel fuel fired engine coolant heater shall be furnished to preheat the engine. The
heater shall include a timer, a thermostat and a circulating pump and shall be connected directly
across the engine coolant inlet and outlet. The heater shall be capable of starting and operating at
minus 60F and shall heat the engine to plus 40F from minus 60F in not more than 1 hour. The
system shall be equipped with a light, visible to the driver to indicate that the preheater is
operating.
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.
3.4.2.1 Starting system (diesel engine). For diesel engine driven vehicles, a 12 or 24-volt
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direct current (dc) starting system, with a 12-volt dc lighting system, shall be furnished. Unless
otherwise specified (see 6.2), a minimum 90-ampere alternator shall be furnished. Engine starting
equipment shall include an ether starting system, glow plug or grid heater. If an ether system is
furnished in lieu of a glow plug or grid heater, it shall be of the measured shot type. The
measured shot type ether system shall be key operated or manually operated from the driver's
compartment, and shall be inoperative with the engine warm. Complete provisions for a
replaceable reservoir of not less than 12 fluid ounces shall be furnished. A reservoir need not be
furnished.
3.4.2.2 Ignition system (gasoline engine). For gasoline engine driven vehicles, a 12-volt
dc system shall be furnished. Unless otherwise specified (see 6.2), an alternator of not less than
60 amperes rated capacity shall be furnished which provides a dc output capacity, at normal
engine idle speed, adequate to support all electrical loads operating simultaneously.
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