Valve Cover Gasket: Functions, Materials and Why It Matters for ...

The valve cover gasket is located on the engine's valve cover and sits flush against the cylinder head. It serves as a critical sealing component between the valve cover and the cylinder head. Although it is a small part of the automobile engine, its functions of dust prevention, sealing, and protection are vital to the engine's proper operation.

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The engine interior is a precision mechanical system, and its internal components must remain clean to ensure smooth operation. The valve cover gasket effectively blocks external dust, dirt, and other contaminants from entering the engine, thereby preventing wear or clogging of engine parts caused by these impurities.

The gasket provides a tight seal to prevent leaks of engine fluids such as oil and coolant. These fluids are essential for engine lubrication and cooling. Any leakage can not only degrade engine performance but may also lead to more severe mechanical failures. The sealing performance also affects the engine's airtightness. A well-sealed gasket ensures that gases in the combustion chamber do not leak externally, maintaining proper combustion and power output.

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The gasket cushions direct contact between the valve cover and the cylinder head, reducing mechanical stress caused by vibration or thermal expansion, thereby extending the lifespan of these components. Under extreme temperatures, the valve cover gasket retains its elasticity and sealing performance, preventing seal failure due to temperature fluctuations.

• Acrylate Rubber (ACM) offers excellent heat resistance, aging resistance, oil resistance, ozone resistance, and UV resistance, making it ideal for high-temperature and oily environments. Its saturated carbon chain backbone and polar ester side groups give it unique advantages. ACM outperforms NBR in heat resistance, aging resistance, and oil resistance, making it widely used in high-temperature and oil-resistant products such as rubber seals and hoses.
• Nitrile Rubber (NBR) has strong intermolecular forces, resulting in higher hardness and more challenging processing. Although its workability can be improved by adjusting polymerization temperatures and blending techniques, NBR's heat resistance is relatively lower, typically withstanding only 140–150°C.

• ACM is widely used in high-temperature and oil-resistant environments, particularly in the automotive industry for components like high-temperature oil seals, crankshafts, valve stems, cylinder gaskets, and hydraulic oil pipes.
• NBR is more commonly used in environments where oil resistance is required but temperatures are not extremely high.

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