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|  MIL-C-53057(ME)
be removable with handtools without the removal of any other
component and shall be located such that the tank contents can be
drained into a 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 or 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.
3.10.2.5 Air cleaner. The engine shall be furnished with a
heavy-duty, dry-type air cleaner in accordance with MIL-A-52363,
class II or class III. The cleaner shall be of the dual element type
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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
ethyleneglycol and water conforming to MIL-A-46153. 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
adjustment range. Belts shall be accessible for easy replacement. If
the fan operates below the 30 inch water fording, provisions shall be
made for disconnecting the fan when necessary for water fording
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