Transmission Pan: Sealant Or No Sealant?

Whether you need a sealant for a transmission pan depends on the type of gasket you are using. Some mechanics recommend using a rubber or composite gasket without a sealant. However, if you are experiencing leaks, a sealant can be used to address the issue. It's important to note that the type of sealant used is crucial, as some sealants can cause damage to the transmission if they get inside. Permatex 81180 Automatic Transmission RTV Sealant is a popular choice that is designed to withstand the harsh detergents and additives found in automatic transmission fluid. It is also important to clean and degrease all mating surfaces before applying the sealant.

Using a gasket sealant can prevent leaks

Using a gasket sealant is an effective way to prevent leaks in your transmission pan. While some vehicles may not come with a gasket, opting for a sealant can be a more permanent solution to leaks.

A gasket sealant is a liquid that hardens over gaps in your transmission pan, creating a durable barrier that stops leaks. This can be an excellent solution if you're dealing with a leaking gasket or if you're looking for a more convenient alternative to a traditional gasket.

There are a variety of gasket sealants available on the market, such as the Permatex Spray Sealant Leak Repair, which forms a rubber barrier to stop leaks in minutes. This type of sealant can be sprayed onto the desired area, making it easy to apply and ensuring that hard-to-reach leaks are sealed without the need for disassembling any parts.

When choosing a gasket sealant, it's important to select one that is suitable for your vehicle's make and model. Some sealants are designed for specific types of engines or materials, so be sure to read the instructions and recommendations carefully. Additionally, it's crucial to follow the application instructions provided by the manufacturer to ensure optimal results and prevent any damage to your vehicle.

By using a gasket sealant, you can effectively prevent leaks in your transmission pan, ensuring the optimal performance of your vehicle and avoiding the hassle and expense of repairs.

Gaskets should be installed dry, with no sealer or RTV

Gaskets should always be installed dry, with no sealer or RTV. Gaskets with advanced leak-sealing technologies built into them can be hindered by the use of RTV or other sealers, which can cause leaks. Gaskets are designed to have a certain amount of compression applied to them, and the addition of RTV or a sealer puts more compression on the gasket than it was designed for. This can cause permanent damage, such as over-compression and splitting, and can also cause the gasket to slide out of place.

RTV can be used as a supplemental sealer in certain situations, such as when there are gaps in the corners or stepped joints of the gasket. However, it should not be applied to the entire gasket, only to the areas that need it. Even then, it is not necessary and can create more work in the future.

Fel-Pro PermaDryPlus® gaskets, for example, offer the latest in sealing technology. They feature proprietary in-house moulded silicone rubber with strategically placed sealing beads moulded to rigid carriers, providing a perfect fit without the need for adhesives. To ensure these technologies work as designed, these gaskets must be installed on a clean, dry surface with no additional sealants used.

In summary, it is important to follow the manufacturer's recommendations for gasket installation and only use RTV or sealants when specifically indicated. Gaskets should be installed dry, with no sealer or RTV, to ensure a reliable seal and avoid potential damage or leaks.

RTV sealants can be difficult to clean off

RTV sealants are commonly used on transmission pans, but they can be difficult to clean off. RTV stands for room temperature vulcanizing. It is a type of silicone that cures and hardens when exposed to air. While RTV is an effective sealant, it can be challenging to remove when necessary.

There are various methods for removing RTV, but all require time and effort. One approach is to use a razor blade to scrape off the bulk of the sealant. This must be done carefully to avoid scratching the surface. Solvents such as toluene, paint thinner, acetone, or lacquer thinner can also be used to soften and break down the RTV, making it easier to wipe away. However, these chemicals can be toxic and require the use of protective gear.

Another option is to use a gasket scraper or a wire wheel or Scotch-Brite pad on a rotary tool to mechanically remove the RTV. Again, care must be taken to avoid damaging the surface. Some people also recommend using a gasket remover product, but these can be less effective and still require significant elbow grease.

In summary, while RTV is a reliable sealant for transmission pans, it can be challenging to remove. The process typically involves a combination of mechanical removal and the use of solvents, and it is important to prioritise safety and surface protection throughout.

Sealants can be used as a replacement for gaskets

Chemical gasket sealants are made from a base material (rubber, silicone, or other compounds) that is blended with a plasticizer (for flexibility), fillers (for specific applications), and a curing or drying agent. They also act as an adhesive, ensuring a leakproof seal.

Form-in-place gasket makers, also known as RTV (room temperature vulcanizing), are a type of chemical gasket sealant that fills surface imperfections and forms a leakproof barrier. They are liquid but can look like gel or caulk. RTV fits exactly to the shape of a part, which is why it is so effective at preventing leaks.

The key to using RTV is to prepare the surface properly and allow enough time for the gasket maker to cure. If these steps are not followed, the RTV will fail. RTV can also be difficult to remove.

Liquid gasket sealants are another type of sealant that can be used without a solid gasket. They have many benefits and are commonly used in automotive applications, especially when repairing older parts. Liquid gasket sealants can also be used to make cheaper gasket materials more robust, increasing adhesion and resistance to chemicals and water.

When deciding whether to use a sealant or a gasket, it is important to consider the specific application and requirements. In some cases, a solid gasket may be sufficient, while in others, a sealant may be necessary to fill gaps and create a leakproof seal.

Permatex is a leading manufacturer of sealants

Whether or not you need a sealant for a transmission pan depends on the vehicle and the type of gasket used. Some vehicles use a rubber gasket that does not require a sealant, while others use a gasket that requires a sealant or RTV (room-temperature vulcanizing) silicone.

Permatex's products are used in vehicle assembly and are known for their ability to seal metal assemblies and prevent leaks in critical vehicle components. The company has a worldwide presence, operating in the United States, Canada, Mexico, and the United Kingdom, and exporting to over 85 countries. They have a state-of-the-art manufacturing facility in Solon, OH, that enables them to collaborate with manufacturers and develop solutions for sealing challenges.

Permatex also provides training and educational resources for automotive professionals and enthusiasts. Their online training portal offers live training seminars, ASE-accredited courses, how-to videos, and more. The company is committed to providing innovative products and knowledge to the automotive community, as evidenced by their sponsorship of Team Permatex and their participation in NASCAR.

Frequently asked questions