MIL-T-62032 Trucks, Tank: Fuel Servicing And Aircraft Fuel Servicing, 1,000 To 4,000 Gallon, Diesel And Gasoline Engine Driven, 16,000 To 50,000 Pounds Gvw, 4X2, 4X4, 6X4, And 6X6, Modified CommercialThis specification covers diesel and gasoline engine driven, four-wheel, two- or four-wheel drive, and six-wheel, four- or six-wheel drive, single or dual delivery fuel servicing and aircraft fuel servicing tank trucks, with product capacities from 1,000 to 4,000 gallons, having minimum gross vehicle weights GVW of 16,000 to 50,000 pounds for normal operating conditions. Vehicles procured under this specification are commercial items which are warranted by the manufacturer as specified in acquisition documents.

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MIL-T-62032H

3.4.1.5  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 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 verification of the coolant level.

3.4.1.6  Coolant temperature control.  Thermostatic control of engine coolant temperature shall be provided.  On diesel engine driven vehicles, control shall include partial thermostatic control of coolant flow through the radiator and thermostatically controlled radiator shutters or 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, and a fuel warmer (diesel engine driven vehicles only) shall be provided. Unless otherwise specified (see 6.2), a battery beater shall be provided, when power plant heaters are specified.  Heaters shall operate on 120-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 of 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 600   F) without cracking or loss of dielectric capacity.  All heated lead wires shall be installed without interfering with vehicle component operation, and without loose excess wire.  A carrier for the connecting cable shall be mounted within the cab or engine compartment and shall provide positive cable retention during vehicle operation.  Heaters shall be furnished as follows:

(1)    Not less than 22 watts per quart heating capacity

(2)    Not more than 18 watts per square inch heating capacity

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