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Gaskets, seals, and packing Gaskets, seals |
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|  MIL-C-53057(ME)
operations without affecting coolant circulation within the engine.
Fan disengagement, shall be controlled from the operator's
compartment with a control labeled "fan disengagement". A welded wire
or expanded metal fan guard shall be provided.
3.10.2.6.2 Water pump. When utilized, the water pump(s) shall be of
the centrifugal type, shall be replaceable, and shall be equipped
with shaft seals that will prevent leakage. The shaft shall be
corrosion resistant when exposed to water and a mixture of
ethylene-glycol and water. Either a lifetime lubrication system or
accessible pressure lubrication fittings shall be provided.
3.10.2.6.3 Thermostat. When utilized, the thermostat shall be in
accordance with the engine manufacturer's recommendations. The
thermostat shall be removable.
3.10.2.6.4. Radiator. When utilized, the radiator assembly shall be
a heavy duty type and shall consist of a core with an expansion tank
and sediment tank. Where the top of the radiator is lower than the
top outlet of the engine, a surge tank may be used. The radiator cap
shall meet the requirements of SAE J164 and be accessible without
removal of the engine hood. A sign warning "CAUTION - DO NOT OPEN
WHEN HOT" shall be placed near radiator cap. The radiator shall be
mounted to prevent its being damaged due to shock and racking
experienced in normal operation of the crane. The radiator shall be
protected by a heavy grilled guard or by the counterweight. A shield
shall be provided, if necessary to protect the radiator from mud and
gravel thrown by the tires. Hoses shall clear the crane structure and
other components under all operating conditions specified herein. The
cooling system shall include baffles and shroud to prevent
recirculation of cooling air.
3.10.2.6.5 Gaskets, seals, and packing Gaskets, seals, and packing
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used in the cooling system shall be made of materials capable of
resisting deterioration from mixtures of water and
ethylene-glycol-base antifreeze conforming to MIL A-46153.
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3.10.2.6.6 Engine coolant hose. All engine coolant hoses shall be
SAE J20, heavy-duty type. All hose clamps shall be stainless steel
type in accordance with SAE J536, type F, style 1, 2, or 4.
3.10.2.7 Governor. A governor shall be provided to limit the engine
speed to not more than the intermittent duty speed recommended by the
engine manufacturer when the crane is operated under any condition
specified herein.
3.10.2.8 Exhaust system. The exhaust system shall be protected
against entry of rain. The back pressure of the exhaust system,
including muffler, shall in no case exceed the maximum recommended by
the engine manufacturer when measured approximately 2 inches beyond
the header outlet at any load up to rated net continuous load. The
exhaust system shall be arranged or shielded to prevent burns to the
operator and maintenance personnel while working on the step surfaces
of the crane. Exhaust discharges shall be directed so as to minimize
the exhaust fumes at the operator's station. The exhaust system shall
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