Should You Use RTV on Valve Cover Gaskets?
When it comes to replacing valve cover gaskets, many mechanics and DIY enthusiasts face a crucial decision: should they use RTV (room temperature vulcanizing) sealant or opt for other methods like adhesive tape or 3M weather strip adhesive? This guide aims to clarify the best practices and potential benefits and drawbacks of using RTV on valve cover gaskets.
Understanding RTV and Gasket Sealing
RTV sealant is a popular choice in automotive repair due to its ability to form a flexible, durable seal. However, its effectiveness and applicability can vary depending on the type of gasket and gasket material being used. Traditional valve cover gaskets, especially those with O-ring seals, do not typically require RTV sealant. Instead, the gasket itself and proper mating surfaces ensure a secure seal.
While some cooling system gaskets benefit from RTV sealant, it is advisable to read the specific instructions provided by the manufacturer or gasket supplier. Some gaskets and gasket materials explicitly warn against the use of sealant, which can lead to leaks or other issues.
Alternatives to RTV for Valve Cover Gaskets
For many modern cars, particularly those with O-ring valve cover gaskets, the use of RTV sealant is unnecessary and can even be counterproductive. Instead, mechanics often prefer:
3M Weather Strip Adhesive: This adhesive allows for a clean, secure installation of the gasket. By gluing the gasket in place and allowing it to cure, you can ensure a tight fit and secure seal. Sealant-Free Installation: A simple and effective method involves ensuring both the mating surfaces and the gasket are clean, then installing the cover without any additional sealant.Regardless of the method chosen, it is crucial to clean the mating surfaces thoroughly to prevent any debris from compromising the seal.
Using RTV: When and How?
RTV sealant can be a valuable tool in specific situations, such as:
Repairing Large Gaps: RTV can effectively seal large gaps that may exist between the valve cover and the mating surfaces. However, this should be done with caution to avoid over-application. Improving Sealant Finishing: In areas where a perfect seal is difficult to achieve, a thin layer of RTV can improve the overall integrity of the seal.When using RTV, it is essential to remember that any leftover sealant that remains in the engine can harden over time. If these hardened materials become dislodged, they can potentially block oilways and lead to catastrophic engine failure. Therefore, it is crucial to use RTV sparingly and to allow sufficient time for it to cure before starting the engine.
Conclusion
While RTV sealant can be a useful tool in certain automotive applications, it is not always the best choice for valve cover gaskets. For most modern vehicles with O-ring seals, alternative methods like 3M weather strip adhesive or sealant-free installation are often more suitable. Always refer to the manufacturer's guidelines and consider the specific needs of your vehicle when deciding whether to use RTV sealant.