Automotive Glossary


Automotive Glossary

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Overbake

The 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 Gear

A gear drive that increases the rotational speed of the output shaft above that of the input shaft.

Overdrive Unit

A separate unit that at one time was fitted on the output shaft of a gearbox. It produces a higher gear ratio.

Overlap

The 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.

Overrun

Movement 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.

Overspray

An 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.

Oversteer

Steering condition of a turning vehicle when the vehicle attempts to turn by a greater degree than the steered position taken by the driver. A difficult driving condition requiring opposite lock to control.

Oxidation

The 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.


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