Automotive Systems

Formerly Automotive Systems I

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VALVE AND VALVE MECHANISMS: Introduction

VALVE AND VALVE MECHANISMS

There are two valves for each cylinder in most engines—one intake and one exhaust. Since these valves operate at different times, it is necessary that a separate operating mechanism be provided for each valve. Valves are held closed by heavy springs and by compression in the combustion chamber. The purpose of the valve actuating mechanism is to overcome spring pressure and open the valve at the proper time. The valve actuating mechanism includes the engine camshaft, the camshaft followers (tappets), the pushrods, and the rocker arms.

Published by SweetHaven Publishing Services
Based upon a text provided by the U.S. Navy

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