The valve cover protects the valve timing and camshaft from dirt and contamination. It seals the upper area of the cylinder head and prevents oil from escaping.
In many cases, the valve cover is also fitted with a gasket to ensure optimum sealing. A well-fitting valve cover is important to prevent leaks and extend the service life of the engine components.
The valve cover is usually made of aluminium or another robust material that can withstand the high temperatures and stresses in the engine.
It is fitted with special gaskets or sealing rings to ensure a reliable seal against the escape of engine oil or combustion gases.