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 TM 9-8000
DEFINITION OF TERMS-CONTINUED
Compressor. A device used to Increase pressure.
Counterclockwise. The direction of movement, usually
rotary, which is opposite in direction to movement of
Concentric. Having a common center, as circles or
hands on the face of a clock.
spheres, one within the other.
Cowl. The front portion of the vehicle body or cab that
Condense. To transform a vapor into a liquid.
partially encloses the dash panel and forms the
windshield frame.
Condenser. 1. See Capacitor. 2. A unit used in
refrigeration systems that removes heat of compression
Crank. A device for converting reciprocating motion Into
from a gas to return It to a liquid state.
rotary motion, and vice versa.
Conductor. A material through which electricity will flow
Crankcase. The lower part of the engine in which the
readily.
crankshaft rotates. In automotive practice, the upper
part is the lower section of the cylinder block, while the
Connecting Rod. Linkage between the crankshaft and
lower section is the oil pan.
piston, usually attached to the piston by a piston pin and
to the crank journal on the crankshaft by a split bearing
Crankcase Breather. The opening or tube that allows air
and bearing cap.
to enter the crankcase and thus permits crankcase
ventilation.
Control Rack. A toothed rod inside mechanical Injection
pumps that rotates the pump plunger to control the
Crankcase Dilution. Dilution of the lubricating oil In the
quantity of Injected fuel.
oil pan by liquid gasoline seeping down the cylinder walls
past the piston rings.
Coolant. The liquid that circulates In an engine cooling
system that reduces heat generated by the engine.
Crankcase Ventilation. The circulation of air through the
crankcase, which removes water and other vapors,
Cooling Fan. The fan In the engine cooling system that
thereby preventing the formation of water sludge and
provides a forced circulation of air through the radiator or
other unwanted substances.
around the engine cylinders so that cooling is affected.
Cranking Motor. See Starter.
Cooling Fins. The thin metal projections on the air-
cooled engine cylinder and head that greatly Increases
Crankshaft. The main rotating member or shaft of the
the heat-radiating surfaces and helps provide cooling of
engine, with cranks to which the connecting rods are
engine cylinder.
attached.
Cooling System. A system that reduces heat generated
Cross-Drive Transmission.
A special type of
by the engine and thereby prevents engine overheating;
transmission used In tanks and other heavy vehicles that
Includes, In liquid-cooled engine, engine water Jackets,
combines the actions of a transmission with torque
radiator, and water pump.
converter, steering system, and differential.
Core. An Iron mass, generally the central portion of a
Current Regulator. A magnetic-controlled relay by which
coil or electromagnet or armature around which the wire
the field circuit of the generator is made and broken very
is coiled.
rapidly to secure even current output from the generator
and to prevent generator overload from excessive
Counterbalance. A weight attached to a moving part so
output. (One of the three units comprising a generator
it will be in balance.
regulator.)
Cutout Relay. 1. See Circuit Breaker. 2. An automatic
magnetic switch attached to the generator to cut out
generator circuit and prevent overcharging of battery.
A-6
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