Sealant and Rubber Valve Cover Gasket Replacements: Best Practices

In modern engine design, rubber materials are commonly used for valve cover gaskets. While sealant might be recommended in certain situations, it is not always necessary. This article will discuss the appropriate use of sealant in the context of replacing a rubber valve cover gasket, with specific focus on factory recommendations, potential issues with sealant contamination, and best practices for a successful installation.

When to Use Sealant

Sealant is often required in specific areas such as sharp bends or uneven surfaces. However, it is generally advisable to avoid using sealant where it is not explicitly called for. Utilizing sealant unnecessarily can complicate the removal process of the valve cover and may even compromise the gasket's sealing performance. It is always best to refer to the factory manual for specific instructions. In cases where sealant is needed, use it in small, controlled amounts. Sealing only the critical areas ensures that the rest of the gasket remains functional and does not interfere with its intended design.

Consequences of Using Sealant Improperly

Using sealant where it is not required can have detrimental effects. When sealant is applied to a gasket, it can squeeze out, reducing the sealing surface and potentially deforming the gasket itself. Sealant can also fill grooves or channels, preventing the gasket from seating properly. Furthermore, sealant can be incompatible with reusable gaskets, rendering them useless if they come into contact with it. Small amounts of sealant in corners or uneven mating surfaces may be necessary, but it is crucial to follow the specific service instructions provided by the manufacturer.

Alternative Methods for Gasket Installation

There are alternative methods for ensuring a rubber valve cover gasket stays in place during installation. For instance, manufacturing-adhesive designed for gaskets can be used to temporarily stick the gasket to the cover, allowing for proper alignment with the engine head. Another situation arises when a front engine cover is also part of the sealing system. In this case, ensuring the intersection of the valve cover gasket and the front cover gasket is properly sealed before final assembly is crucial. Additionally, in cases where cam bearing caps form corners that need to be sealed, a small amount of sealant should be applied to each corner prior to install. However, it is essential to use only a minimal amount of sealant, typically no more than an 1/8-inch wide bead along the joint. Any excess can lead to problems, such as blocking the oil pump screen or causing other issues.

Conclusion

In the context of replacing a rubber valve cover gasket, the use of sealant should be carefully considered. While it can be useful in certain situations, it should not be used unless explicitly required by the manufacturer. By following the appropriate service information and using sealant in controlled, small amounts, you can ensure a reliable and durable engine performance. Proper application of a rubber valve cover gasket helps prevent leaks, ensuring the longevity and efficiency of your engine.