COOLING FAN--The fan in the engine cooling
CONTINUITY EQUATION--The mass rate of fluid
system that provides a forced circulation of air
flow into any fixed space is equal to the mass flow
through the radiator or around the engine cylinders
rate out. Hence, the mass flow rate of fluid past all
so that cooling is affected.
cross sections of a conduit is equal.
COOLING FINS--The thin metal projections on the
CONTROL--A device used to regulate the function of
air-cooled engine cylinder and head that greatly
a component or system.
increase the heat-radiating surfaces and helps
CONTROL, CYLINDER--A control in which a fluid
provide cooling of the engine cylinder.
cylinder is the actuating device.
COOLING SYSTEM--A system that reduces heat
CONTROL, ELECTRIC--A control actuated elec-
generated by the engine and thereby prevents
trically.
engine overheating. In a liquid-cooled engine, it
CONTROL, HYDRAULIC--A control actuated by a
includes the engine water jackets, radiator, cooling,
liquid.
and water pump.
CONTROL, MANUAL--A control actuated by the
CORE--An iron mass, generally the central portion of
operator.
a coil or electromagnet or armature around which
the wire is coiled.
CONTROL, MECHANICAL--A control actuated
CORROSION--The slow destruction of materials by
ical elements.
chemical agents and electromechanical reactions.
CONTROL, PNEUMATIC--A control actuated by
COUNTERBALANCE--A weight attached to a
air or other gas pressure.
moving part so it will be in balance.
CONTROL RACK--A toothed rod inside mechanical
COUNTERCLOCKWISE--The direction of move-
injectors that rotates the pump plunger to control
ment, usually rotary, which is opposite in direction
the quantity of injected fuel.
to movement of hands on the face of a clock.
CONTROL, SERVO--A control actuated by a feed-
COWL--The front portion of the vehicle body or cab
back system that compares the output with the
that partially encloses the dash panel and forms the
reference signal and makes corrections to reduce
windshield frame.
the difference.
CRANK--A device for converting reciprocating mo-
CO N T R O L S , P U M P -- C o n t r o l s a p p l i e d t o
tion into rotary motion, and vice versa.
positive-displacement variable delivery pumps to
CRANKCASE--The lower part of the engine in
adjust their volumetric output or direction of flow.
which the crankshaft rotates. In automotive prac-
CONVERGENT--That which inclines and ap-
tice, the upper part of the crankcase is the lower
proaches nearer together, as the inner walls of a
section of the cylinder block, while the lower sec-
tube that is constricted.
tion is the oil pan.
COOLANT--The liquid that circulates in an engine
CRANKCASE BREATHER--The opening or tube
cooling system that reduces heat generated by the
that allows air to enter the crankcase and thus
engine.
permits crankcase ventilation.
COOLER--A heat exchanger, which removes heat
CRANKCASE DILUTION--Dilution of the lubri-
from a fluid.
cating oil in the oil pan by liquid gasoline seeping
down the cylinder walls past the piston rings.
COOLER, AFTERCOOLER--A device that cools a
gas after it has been compressed.
CRANKCASE VENTILATION--The circulation of
air through the crankcase, which removes water
COOLER, INTERCOOLER--A device that cools a
and other vapors, thereby preventing the formation
gas between the compressive steps of a multiple
of sludge and other unwanted substances.
stage compressor.
CRANKING MOTOR--See STARTER.
COOLER, PRECOOLER--A device that cools a gas
before it is compressed.
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