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|  MIL-T-11663K
3.4.1.5 Coolant temperature control. Thermostatic control of engine coolant temperature
shall be provided. On diesel engine driven vehicles, the 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.
3.4.1.6 Governor. An engine governor shall be furnished and set and sealed to limit the
engine to the engine manufacturer's maximum recommended operating speed.
* 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.
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. The heaters shall operate on 110-volt alternating current (ac), and shall be wired
through a junction block to a single three-pronged (male), weatherproof slave receptacle for
receiving external power and grounding 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. 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). The
electrical insulation of the connecting cable shall withstand normal operating stresses in low
ambient air temperatures (down to minus 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 shall be furnished as follows:
*
(a)
Coolant heater, 1500-watt minimum rating, shall be installed in the engine block or in
the lower coolant inlet hose. An engine coolant thermostat with an operating range of
170 to195F shall be installed
Immersion type engine oil heater, 300-watt minimum rating with 170 to 195F
(b)
thermostat, shall be installed in the oil pan through any convenient opening
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