Monday, 29 April 2024, 4:31 AM
Site: IMI eLearning
Course: IMI eLearning (IMI eLearning)
Glossary: Automotive Glossary
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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. |
OversteerSteering 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. |
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. |