 |
|||
|
|
|||
| ||||||||||
|
|  MIL-T-62087E
* 3.4.1.2 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.
3.4.1.3 Power plant heaters. When specified (see 6.2), a coolant heater and an engine oil
heater 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 120 volts 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 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 opposite end. All 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 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)
A coolant heater, 1000-watt minimum rating, shall be installed in the engine block or in
the lower coolant inlet hose. An engine thermostat with an operating range of 170F to
195F shall be installed.
An immersion type engine oil heater, 300-watt minimum rating, with 170F to 195F
(b)
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 10F during vehicle exposure in ambient air temperatures
as low as minus 60F, and shall embody a thermostat to limit the temperature of the
electrolyte to not more than 80F.
3.4.2 Electrical system.
3.4.2.1 Alternator. An alternator of not less than 50 amperes rated capacity and which
provides not less than 16 amperes dc at normal engine idle speed shall be furnished.
3.4.2.2 Battery. The battery reserve capacity rating, measured in accordance with SAE J537,
shall be not less than 100 minutes. The cold cranking rating at 0F, measured in accordance with
SAE J537, shall be not less than 450 amperes. The battery shall be of the maintenance-free type
having the maintenance-free characteristics listed in W-B-131.
7
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals