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|  MIL-T-83808
(84)
c. Four hundred miles at 3,000 pounds DBP
d Five hundred miles at 2,000 pounds DBP
e. Eight hundred miles at 1,000 pounds DBP
Chassis. Except as specified in this specification, the chassis (with cab) components, assem-
3.3
blies and accessories to be delivered under this contract shall be standard or optional items which meet
or exceed the requirements of this specification. The chassis with cab shall be a commercial type modi -
fied for SE/AC towing. All chassis (with cab) items shall be represented in the chassis manufacturer's
technical data. All chassis (with cab) items considered standard equipment on the vehicle model to be
supplied under the applicable contract shall be furnished, except when the requirements of this specifica-
tion preclude compliance. Technical data shall be limited to specifications and technical material identical
to that furnished to the authorized company representatives for selection of chassis and components and
shall be on file in the engineering offices of the procurement activity prior to presentation of the prepro-
duction model or first production article, if preproduction model is not required.
hee I base modification Wheel base
shall be 90 inches, plus two inches, minus O inches
3.3.1
Frame modification (if any) shall be accomplished
by standard modified commercial practices and shall
not degrade strength and performance of frame.
Driveshaft provided shall be a standard commercial
product and shall have an input torque capacity at
least equal to the maximum torque [before parasitical
loss) delivered by the engine
3.3.2
Powertrain.
Engine The vehicle shall be equipped with a commercial (see 6.3.2) liquid cooled diesel en-
3.3.2.
gine. The total power output required by all items driven by the engine shall not exceed its net power
output rating at 2,000 feet elevation, determined in accordance with SAE J1349. The engine shall demon-
strate the performance characteristics specified herein when operating on diesel fuel in accordance with
W-F-800 and Grade JP-8 turbine fuel. the primary fuel, in accordance with MIL-T-83133 The engine shall
also demonstrate the performance characteristics specified herein when operating on Grade JP-4 turbine
fuel, the alternate fuel, in accordance with MIL-T-5624. When operating on JP4, a minimal horsepower
degradation is expected: but no greater than a 15 percent reduction IS acceptable, see paragraph 46.78
for testing. Also, the reduction of the fuel system's life operating on JP-4 is not to exceed 50 percent of the
expected life of the system on JP-8. No change in any engine component is allowed. The engine shall be
certified by NATO AEP-5 test procedures. Any engine that is adversely affected by either of the above
fuels is not acceptable.
3.3.2.1.1
overnor Engine governor shall be furnished and set and sealed to limit vehicles speed to
that specified in 3.2.
Engine cooling system. The engine shall be equipped with a cooling system capable of satis-
3.3.2.1.2
factory performance under the environmental conditions specified herein in an ambient temperature of not
less than +125F and a relative humidity of 90 percent; coolant temperature shall not exceed the engine
manufacturer's recommended maximum. Expansion tanks of sufficient capacity for expansion of all
coolant in the system shall be provided.
3.3.2.1.2.1 Coolant recovery system. An overflow coolant recovery system shall be furnished. The cool-
ant recovery system shall include an unbreakable translucent reservoir of not less than two quart capac-
ity. The reservoir shall be located in a position readily visible for checking coolant level.
3.3.2.1.3 Engine start ing syste m The engine shall start within 15 seconds in any ambient temperature
within the required operating range of the vehicle (see 3.1.4) Installed glow plugs, fluid starting aids and
neat from the winterization system (see 3.6, may be used prior to and during the start period to facilitate
engine starting under the following conditions:
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