Glossary of Auto Terms

DriverSide's Car Dictionary has the most comprehensive definitions of automotive terms. This auto glossary can help you decipher what your mechanic is fixing and what the purpose or function of the particular auto part or accessory is for. We have taken the mystery out of automotive service jargon, so that you don't have to.

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Overhead Cam

A camshaft "over the head" rather than below the cylinders in the engine block, and generally considered a more modern engine design. Overhead cams eliminate the need for pushrods to open and close the valves. If you ever see letters such a "DOHC" on an engine, this means Dual Over Head Cam," as in two cams in the cylinder head.



See Also:
Piston
Differential
Push Rods
Flushing
Cam
Rings
Diesel Engine
Timing Belt

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