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In mechanical engineering, Tappet is referred to the projection of some kind which is imparting the linear motion to other component within an assembly. In other words, tappet is considered to that part of the rocker arm, which is in the contact of the intake or exhaust valve stem, placed above the cylinder head of the internal combustion engine. As the cam rotates it generates a sideways and downward force on the tappet. In the absence of any tappet, the sideways force would make the valve stem to bend. Due to the tappet, the sideways force gets transferred to the cylinder head which in turns make only the downward force acts on the valve stem. In case of the most modern overhead cam engines the camshaft comes directly over the valves. In the case of other overhead cam engines, a rocker arm pivots on a fixed shaft and the one projection of the rocker arm rides on a cam of the rotating camshaft. In both above mentioned cases, it gives rise to an oscillating linear motion, with the valve opening.