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|  MIL-T-62246B(AT)
3.4.2.5 Batteries. Each battery shall be of 12-volt potential. The total reserve capacity
ratings and the total cold cranking ratings at 0F, both measured in accordance with SAE J537,
shall be not less than specified in table I. The batteries shall be of the maintenance free type
having the maintenance-free characteristics listed in W-B-131.
TABLE I. Batteries.
Reserve capacity
Cold cranking
Engine type
(minutes)
(amperes)
Diesel
320
1,200
Gasoline
100
450
* 3.4.2.6 Radio interference suppression. The vehicle shall be suppressed to limit
electromagnetic radiation in accordance with SAE J551. Any body equipment emitting
electromagnetic radiation, except the vibrating roller auxiliary engine (see 3.5.5.3), shall be
suppressed to the same level as the vehicle chassis.
3.4.3 Fuel system. The fuel system shall conform to Federal Motor Carrier Safety
Regulations 393.65 and 393.67.
*
3.4.3.1 Air cleaner. An air cleaner shall be furnished.
* 3.4.3.2 Fuel tanks. The fuel tank(s) shall be the manufacturer's standard for the vehicle
specified with not less than 30 gallons total capacity. When more than one tank is furnished on
diesel engine driven vehicles, means shall be provided to assure an equalized fuel level in both
tanks. When more than one tank is furnished on gasoline engine driven vehicles, a selector valve
connecting either tank to the engine fuel intake shall be provided and means shall be provided to
monitor the fuel level of either tank from a single fuel gage.
* 3.4.4 Exhaust system. The exhaust system shall conform to Federal Motor Carrier Safety
Regulation 393.83. If vertical exhaust mufflers are furnished, a heat shield shall be furnished.
Vertical exhaust systems shall be provided with a hinged rain cap.
* 3.4.5 Transmission. Unless otherwise specified (see 3.4.5.2), a manually shifted
transmission shall be provided. The input torque capacity of the transmission shall be at least
equal to the maximum torque delivered by the engine. The manually shifted transmission shall
have not less than five forward and one reverse speed with SAE J704 power takeoff openings on
both right and left sides. The transmission shall provide for synchronized shift for at least the
three highest forward speeds, or a constant mesh transmission may be provided. The
transmission and axle gear ratios shall be selected to provide the performance specified in 3.3.1
through 3.3.1.3.
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