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|  MIL-T-46765(AT)
* 3.4.1.6 Coolant temperature control. 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.
* 3.4.1.7 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 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 fuel warmers (diesel engine driven vehicles only) shall be provided.
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. The receptacle shall be located
on the streetside of the vehicle, as near the cab door as possible. A three-wire connecting cable,
not less than 7600 mm (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, 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 temperature (down to -51C (-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 and fuel warmers shall be furnished as follows:
*
(a) A coolant heater, 1000-watt minimum rating, shall be installed in the engine block or
lower, coolant, inlet hose. An engine thermostat with an operating range of 77C to
90C (170F to 195F) shall be installed;
* (b) An oil pan heater of the permanent external surface mount, permanent in-pan mount, or
immersion type that meets the following requirements, shall be installed:
*
(1) Not less than 16 W/L (15 watts per quart) heating capacity
(2) Not more than 2.8 watts per square centimeter (W/cm2) (18 watts per square inch)
*
heating capacity
(3) Thermal balance design or thermostat control providing for uninterrupted operation
(4) Provision for mounting below minimum service oil level.
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