Glossary “overhead camshaft” Definition:
Camshaft mounted in the cylinder head.
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overflow tank
Glossary “overflow tank” Definition:
1). Tank at the top of a radiator to receive heated coolant and vent trapped air due to expansion. 2). Device found in some fuel tanks to prevent gas escaping due to expansion. 3). Term used for expansion tank.
overdrive ratio
Glossary “overdrive ratio” Definition:
Ratio identified by the use of a decimal point, such as 0.80, indicating less than one driving input revolution compared to one 1.0 output revolution of a shaft, or 0.80:1.0.
overflow
Glossary “overflow” Definition:
1). The spilling of the excess of a substance. 2). To run or spill over the sides of a container.
overcooling
Glossary “overcooling” Definition:
Term used if the engine does not reach design operation temperature in a predetermined time period.
overcord
Glossary “overcord” Definition:
The covering bonded to the tensile member of a synchronous belt that protects it form frictional wear if a backside idler is used or if power is transmitted from the backside of the belt.
overdrive
Glossary “overdrive” Definition:
Ration of less than 1:1 where the output shaft turns at a greater rpm than does the input shaft.
overdrive band
Glossary “overdrive band” Definition:
Transmission brake device that is engaged in overdrive.
overcenter spring
Glossary “overcenter spring” Definition:
Spring used on some clutch linkages to reduce the effort required to depress the pedal.
overcharge
Glossary “overcharge” Definition:
1). Term used when too much refrigerant or oil is added to the refrigeration system. 2). Condition where the charging system is supplying too much voltage/current to the battery.
overcharging
Glossary “overcharging” Definition:
Continual charging of a battery after it has reached its normally charged condition.
overall ratio
Glossary “overall ratio” Definition:
The product of the transmission gear ratio multiplied by the final drive or rear axle ratio.
overall refinishing
Glossary “overall refinishing” Definition:
Painting the whole vehicle.
overbore
Glossary “overbore” Definition:
To enlarge the cylinders of an engine to a size larger than stock diameters.
overcenter preload
Glossary “overcenter preload” Definition:
The adjustment of a steering-gear-sector shaft’s resistance to turning.
over
Glossary “over” Definition:
Term used for bore or overbore. Any measurement that is outside specification.
over run clutch
Glossary “over run clutch” Definition:
See one way clutch.
over running clutch
Glossary “over running clutch” Definition:
See sprag.
oval port
Glossary “oval port” Definition:
Exhaust or intake port that is oval in shape.
OVCV
Glossary “OVCV” Definition:
Outer Vent Control Valve