Definitions for "Tappet"
Keywords:  cam, actuator, lever, imparts, valve
A lever or projection moved by some other piece, as a cam, or intended to tap or touch something else, with a view to produce change or regulate motion.
Adjustable component to vary the clearance gap between the valve stem and corresponding actuating mechanism. It provides the correct clearance, allowing for wear and thermal expansion.
a lever that is moved in order to tap something else