A tappet is an arm, collar or cam within a machine which imparts intermittent motion.

Roller Tappets

Valve lifters that have a roller placed on the end contacting the camshaft. This is done to reduce friction between the lobe and lifter.

Tappet Noise

Noise caused by the lash or clearance between the valve stem and rocker arm or between the valve stem and valve lifter.

See also: Cam.

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Subjects: Engines Mechanical Engineering