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|  MIL-T-62097C
condition, shall not disable or cause elimination of the fuel gage sending unit and
shall not violate 3.2.1 or any Federal Motor Carrier Safety Regulation. A coolant
shut off valve shall be included. The units required by 3.4.1.8(c) and (d) may be
combined.
*
3.4.1.9 Fuel fired engine preheater. When specified (see 6.2), for diesel engine driven
vehicles, a diesel fuel fired engine water heater shall be furnished to preheat the engine. The
heater shall include a timer, a thermostat and a circulating pump and shall be connected to the
engine coolant system. The heater shall be capable of starting and operating at -60F and shall
heat the engine to +40F from -60F in not more than 1 hour. The system shall be equipped with
a light, visible to the driver, to indicate that the preheater is operating. The system shall include
fuel warmers or preheaters conforming to 3.4.1.8(c) and (d).
*
3.4.1.10 Vernier throttle control. When specified (see 6.2), a manual vernier controlled
throttle with quick release shall be furnished, except on electronically controlled engines.
3.4.2 Electrical system. The electrical system shall be in accordance with Federal Motor
Carrier Safety Regulations 393.27 through 393.31 and 393.33.
*
3.4.2.1 Starting system. For diesel engine driven vehicles, a 12- or 24-volt direct current
(dc) starting system, with 12-volt dc lighting system shall be furnished. Engine starting
equipment shall include an ether starting system, glow plug or electric grid heater. If an ether
system is furnished in lieu of a glow plug or grid heater, it shall be of the measured shot type.
The measured shot type ether system shall be key operated or manually operated from the
driver's compartment and shall be inoperative with the engine warm. Complete provisions for a
replaceable ether reservoir of not less than 12 fluid ounces shall be furnished. A reservoir need
not be furnished. When specified (see 6.2) for diesel engines, the starting motor shall be
equipped with a thermostat controlled, automatic resetting circuit breaker to protect the motor
from overcrank heat damage. The circuit breaker shall not limit cranking ability for a startable
engine.
*
3.4.2.2 Ignition system. For gasoline engine driven vehicles, a 12-volt dc ignition
system shall be furnished.
*
3.4.2.3 Alternator. Unless otherwise specified (see 6.2), on diesel engine driven vehicles
a minimum 65-ampere alternator shall be furnished. For diesel engine vehicles, the alternator
output at engine idle speed shall be not less than 45 amperes. Unless otherwise specified
(see 6.2), on gasoline engine driven vehicles, an alternator of not less than 85 amperes rated
capacity and which provides not less than 45 amperes dc output at normal engine idle speed,
shall be furnished.
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