Automotive Glossary
Automotive Glossary
Browse the glossary using this index
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OverbakeThe result of curing a paint film at too high temperature, or for longer than the specified time. The film often becomes too hard and brittle. | |
Overdrive GearA gear drive that increases the rotational speed of the output shaft above that of the input shaft. | |
Overdrive UnitA separate unit that at one time was fitted on the output shaft of a gearbox. It produces a higher gear ratio. | |
OverlapThe area of coverage in which one spray pass is extended over and partly covered by the next pass. | |
Overlap (Valve)The term used to describe the angle of crankshaft rotation when the inlet and exhaust valves are both open. | |
OverrunMovement of vehicle when engine is not under power. Engine braking. | |
Overrun Clutch(1) A clutch on a starter drive pinion that prevents the engine from driving the starter motor after the engine has started. (2) A one-way clutch in an automatic transmission. | |
OversprayAn overlap of dry spray particles landing on areas that were not meant to be painted, or on previously painted areas where they do not blend in. | |
OxidationThe chemical combination of oxygen and the binder of synthetic-enamel type paints which leads to drying. Also refers to the destructive combination of oxygen with a dry paint film leading to age degradation, or the destructive combination of oxygen and metal commonly known as Corrosion. | |