Describe push rod overhead valve operating mechanism with neat sketch.

Describe push rod overhead valve operating mechanism with neat sketch.
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Answer :

Push rod Overhead valve operating mechanism (OHV 4 -S engine): An overhead valve engine (OHV engine) is an engine in which the valves are placed over the cylinder head. The camshaft drive-chain sprocket has twice as many teeth as the crankshaft sprocket, so that the camshaft rotates at half engine speed. The overhead valve system (OHV) system, operated by pushrods, has the camshaft adjacent and parallel to the crankshaft in the cylinder block. In overhead-valve (OHV) system, as the pushrod rises on the cam it pivots the rocker arm, which pushes the valve down (open) against the pressure of its spring. As the cam lobe rotates further, the valve spring acts to close the valve. As the crankshaft rotates, each valve is opened by means of a tappet, pushrod and rocker arm. The valve is closed by spring pressure. This overhead-valve (OHV) system is less efficient than an overhead camshaft because the number of moving parts limits the speed at which the engine can run safely. Overhead valve arrangement makes the engine slightly shorter than overhead camshaft.

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