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 170 F to
195 F shall be installed
(b) Immersion type engine oil heater, 300-watt minimum rating, with 170 F to 195 F
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 l0 F during vehicle exposure in ambient air temperatures as low as minus 60 F, and shall embody a thermostat to-limit the temperature of the electrolyte to not more than 80 F
(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 40 F to an outlet temperature of plus 9 F, 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 60 F and shall heat the engine to plus 40 F from minus 60 F 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 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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