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|  MIL-T-52843C
container. The fuel tank shall be protected by position or otherwise
from external damage. Fuel lines shall provide continuous operation
at full throttle and maximum loads, including slope ascension. The
fuel system shall include a fuel transfer pump, fuel strainer, water
separator with provisions for draining sediment, fuel filter(s) in
accordance with engine manufacturer's recommendations and a fuel
injection pump, including provisions for priming. The fuel strainer
and fuel filter(s) shall be between the fuel tank and fuel transfer
pump. A fuel shutoff valve in the fuel line shall be provided between
the tank and the fuel filter(s) if fuel filter(s) are located below
the top of the fuel tank. It shall be labeled:
"Fuel Shut Off ON/OFF".
3.10.2.5 Air cleaner. The engine shall be furnished with a heavy-
duty, drytype air cleaner in accordance with MIL-A-52363, class II or
class III. The cleaner shall be of the dual-element type and shall
include a dust scavenger. The capacity of the air cleaner shall be in
accordance with the engine manufacturer's recommendations. An air-
cleaner intake-restriction indicator shall be provided and shall be
visible from the operator's compartment. The intake-restriction
indicator shall have graduated markings with continuous reading on
remaining service of the air cleaner with and without the engine
running. The indicator shall also have reset capabilities.
3.10.2.6 Cooling system. When a liquid-cooled engine is furnished,
the cooling system shall be the closed-pressure-type, incorporating a
radiator with a radiator pressure cap, hoses, thermostat, fan, and
circulating pump. Under all operating conditions specified herein,
the temperature differential between the cooling system (radiator top
tank) and ambient air temperature shall be less than the difference
between the boiling point of the pressurized system and 120 F.
Drains shall be provided to completely empty the cooling system.
Petcocks on all drains shall be accessible and contents should drain
into a container. The cooling-system fluid shall be a solution of
ethylene-glycol and water conforming to MIL-A-46153 or SAE J1034. All
fill ports shall be accessible. When an air-cooled engine is
furnished, the engine shall be cooled by a fan that is either gear-
driven, belt-driven, or directly driven from the crankshaft. The air
intake face of the fan shroud shall be provided with a removable
grille or screen guard.
3.10.2.6.1 Fan. The fan shall either discharge away from the
operator, or be a suction type used in conjunction with a radial flow
type shrouding such that the air drawn through the radiator is
redirected in a radial direction around and about the radial
shrouding and then expelled out the sides of the engine compartment.
The fan shall rotate on antifriction bearings. When utilized, the fan
belt takeup shall be at least 3 percent of the belt circumferential
length, plus an allowance for replacement of new belts without
forcing. The belts shall be clear of all other components within the
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