MIL-T-62319 Trucks, Cargo: Diesel Or Gasoline Engine Driven, 19,000 To 24,000 Pounds Gvw, 4X2 And 4X4, CommercialThis specification covers diesel or gasoline engine driven, four-wheel, two-rear-wheel drive, and four-wheel, four-wheel drive cargo trucks, having minimum gross vehicle weights GVW of 19,000 to 24,000 pounds, for normal operating conditions. The vehicles procured under this specification are commercial items which shall be warranted by the manufacturer as specified in acquisition documents.

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MIL-T-62319C

3.4.1.8 Silicone rubber hoses. When specified (see 6.2), silicone rubber radiator and heater hoses shall be furnished.

* 3.4.1.9 Power plant heaters and fuel warmer. 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), 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 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). Electrical insulation of the connecting cable shall

withstand normal operating stresses in low ambient air temperatures (down to minus 60 F) 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:

(a) A coolant heater, 1500-watt minimum rating, shall be installed in the engine block or lower coolant inlet hose. Engine thermostat with an operating range of 170 F to 195 F shall be installed

(b) An immersion type engine oil heater, 300-watt minimum rating, with 170 F to 195 F

thermostat, shall be installed in the oil pan through any convenient opening

(c) The battery heater shall have a capacity adequate to maintain the battery electrolyte at a temperature of not less than 10 F during vehicle exposure in ambient air temperatures as low as minus 60 F, and shall include a thermostat to limit the temperature of the electrolyte to not more than 80 F

(d) A fuel warmer or pre-heater 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 fuel flow rate 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.

3.4.2 Electrical systems. Electrical systems shall be in accordance with Federal Motor

Carrier Safety Regulations 393.27 through 393.31 and 393.33.