It is used to convert rotary motion of the crankshaft into linear motion of the follower or lifter. Thus, it operates the inlet and exhaust valve through rocker arms. It has so many cams as the number of valves in an engine. A additional cam is also provided to drive the fuel pump. The camshaft rotates inside the plain bearings. It is driven by crankshaft through train and gear train. It is rotated at half of the speed of the crankshaft.
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