Automotive Glossary


Automotive Glossary

Browse the glossary using this index

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O

Oil Pump

An mechanically driven pump used to supply oil pressure.

Oil Seal

A seal that prevents oil loss. Usually described as a radial lip seal but other types are used.

Oil Separator

Plates or baffles used to prevent oil being mixed with air or drawn through air pipes.

Oil Strainer

The mesh filter on the end of an oil pick up pipe.

Oil-Based Paints

Paints which dry by absorbing oxygen from the atmosphere. This 'uptake of oxygen' promotes a chemical reaction which is irreversible.

On Board Diagnostics (OBD)

See OBD

One-way Clutch

An automatic mechanical clutch that permits drive from one shaft to another in one direction only. A drive transmitted to the outer hub of the clutch bypasses the inner hub and the clutch free wheels. This type of clutch allows drive to be transmitted by two alternative routes and at different rotational speeds.

Opacimeter

Smoke meter used to measure the amount of smoke in diesel engine exhaust gases.

Opacity

The ability of a paint film to obliterate the colour or pattern of a surface. Opacity is measured by determining the minimum thickness at which a paint film will completely obscure a black and white pattern.

Opaque

Impervious to light transmission -non-transparent.


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