MIL-B-45367 Buses, Motor: Transit, Ambulance Conversion, Forward Control, With Hight Headroom, 30 And 44 Passenger, 2 Wheel DriveThis specification covers 30- and 44-passenger, forward driver control, two-wheel drive, diesel engine driven motor buses with ambulance conversion features. The bus body shall be a flat front type with high headroom. Vehicles shall have manufacturer\'s standard rear wheel drive, soft ride suspension, heavy duty bus chassis frame, and single front and rear axles. Vehicles procured under this specification are commercial items which shall be warranted by the manufacturer as specified in acquisition documents.

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MIL-B-45367AA

(d) A fuel warmer or preheater shall be provided to prevent clogging of fuel filters due

to wax crystallization in the fuel. The fuel warmer shall use engine coolant to

transfer sufficient heat to the diesel fuel to heat it from an inlet temperature of minus

40�F to an outlet temperature of plus 9�F, with a flow rate not less than the

maximum fuel demand of the engine fuel system. A coolant shutoff valve shall be

provided for the coolant inlet side of the fuel warmer unit.

3.4.1.7 Fan clutch. A fan clutch shall be furnished. 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 Fuel fired engine preheater. When specified (see 6.2), a diesel fuel fired engine

water heater shall be furnished to preheat the engine. The heater shall include a timer, a

thermostat and circulating pump; and shall be connected to the engine coolant system. The

heater shall be capable of starting and operating at minus 60�F and shall heat the engine to

plus 40�F from minus 60�F 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.

3.4.2 Electrical systems. The electrical systems shall be in accordance with Federal

Motor Carrier Safety Regulations 393.27 through 393.31 and 393.33.

3.4.2.1 Radio interference suppression. The vehicle shall be suppressed to limit

electromagnetic radiation in accordance with SAE J551. Any body equipment emitting radiation

shall be suppressed to the same level as the vehicle chassis.

3.4.2.2 Diesel engine starting system. A 12- or 24-volt direct current (dc) starting

system with a 12-volt lighting system shall be furnished. Engine starting equipment shall

include an ether starting system or a glow plug. If an ether system is furnished in lieu of a glow

plug, 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 reservoir need not be furnished.

3.4.2.3 Alternator. The rated amperage capacity of the alternator provided shall be not

less than 130 amperes at not more than 60 percent of the engine governed speed and not less than

50 amperes at engine idle speed. A transistor type voltage regulator shall be furnished.