Rocker Arm

A lever that transmits the action of the cam, usually by means of a push rod, to the stem of the intake or exhaust valve, sometimes also to the starting-air valve and fuel valve.

The rocker arm highlighted on a Bentley BR.1 Rotary engine.

Adjustable Rocker Arm

A type of rocker arm with an adjusting nut that can be tightened or loosened to adjust the valve to rocker arm gap.


See also: Camshaft, Internal Combustion Engine, Poppet Valve.

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Subjects: Mechanical Engineering