A tappet in mechanical engineering is a projection which imparts a linear motion to some other component within an assembly. Properly speaking, a tappet is only that part of a rocker arm which makes contact with an intake or exhaust valve stem above the cylinder head of an internal combustion engine. As the cam rotates it creates both a sideways and a downward force on the tappet. Without a tappet (and the cam acting directly on the valve) the sideways force would cause the valve stem to bend. With a tappet the sideways force is transferred to the cylinder head so only the downward force acts on the valve stem. For more information plz click on image.
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