Marianne Martinez
Whether to use RTV sealant or a gasket to seal a transmission pan is a highly debated topic. Some people advocate for using RTV sealant, such as Permatex Gray RTV sealant, as it can create a strong seal and prevent leaks. Others argue that using a gasket is a better option, as RTV sealant can be messy and difficult to work with, and any mistakes in the application process can lead to leaks and damage to the transmission. Ultimately, the decision depends on various factors, including the specific vehicle, personal preference, and comfort with the application process.
| Characteristics | Values |
|---|---|
| RTV sealant use cases | Some people use RTV sealant on their transmission pans, especially if the pan did not come with a gasket from the factory. |
| RTV sealant application | When applying RTV sealant, it is important to clean the mating surfaces, spread a thin bead of RTV, bolt the pan up, and let it cure for at least 24 hours before filling with fluid. |
| RTV sealant pros | RTV sealant can create a strong seal that prevents leaks. It is oil-resistant and designed to not break down. |
| RTV sealant cons | RTV sealant can be difficult to apply, especially when working alone. If not applied correctly, it can leak or get squeezed out. Little chunks can get loose and into valve bodies. |
| Alternatives to RTV sealant | Gaskets, either rubber or cork, are often recommended as an alternative to RTV sealant. Some people also mention using a product called Hondabond. |
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What You'll Learn
RTV sealant vs. gasket
RTV sealant and gaskets are both used to seal transmission pans. However, the two methods have their own unique characteristics and advantages.
RTV sealant, or Room Temperature Vulcanizing sealant, is a type of silicone adhesive that cures at room temperature to form a strong, flexible seal. RTV sealant is known for its excellent heat resistance, making it suitable for high-temperature applications such as in automotives, ovens, and heating systems. It is also versatile, bonding well with various materials such as metal, glass, wood, and plastic. RTV sealant is typically easy to apply, and some types are designed specifically for use with transmission fluid. However, RTV sealant may not be suitable for all transmission pans, as it requires a groove or retention mechanism to prevent it from being squeezed out. Additionally, RTV sealant can be difficult to remove and may require special tools such as a razor blade or putty knife.
On the other hand, gaskets are pre-formed seals that are placed between two surfaces to create a tight seal. Gaskets are often made of rubber or cork, with some types featuring metal washer-type inserts to prevent over-tightening. Gaskets are generally considered easier to work with and less messy than RTV sealant. They can also be reused multiple times, making them a more cost-effective option in some cases. However, gaskets may not always provide a perfect fit, and there is a risk of leaks if they are not installed properly.
When deciding between RTV sealant and gaskets for sealing a transmission pan, it is important to consider the specific application and working conditions. While RTV sealant offers excellent heat resistance and versatility, gaskets provide a simpler and potentially more reliable solution. It is always recommended to consult a professional or refer to the manufacturer's instructions before proceeding with any sealing or repair work.
In conclusion, both RTV sealant and gaskets have their advantages and considerations. RTV sealant is a versatile and heat-resistant option, but it may require careful application and can be challenging to remove. Gaskets, on the other hand, offer ease of use, reusability, and a reliable seal, but they may not fit perfectly in all cases. Ultimately, the choice between RTV sealant and gaskets depends on the specific requirements and constraints of the sealing project.
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RTV sealant brands
While some sources advise against using RTV sealant on an automatic transmission pan, others recommend specific RTV sealant brands for this purpose.
RTV stands for Room Temperature Vulcanizing, and it is a type of silicone that cures at room temperature. RTV sealant is commonly used as a gasket compound, forming a tough and flexible rubber that resists ageing, weathering, and extreme temperatures.
Some popular RTV sealant brands include Permatex, Loctite, Akfix, KRAKEN BOND, SANVO, and Threebond. Permatex Ultra Grey-rigid high-torque RTV, for example, has been used successfully to seal a transmission pan. Threebond also sells an RTV specifically designed for trans fluid.
It is important to note that not all RTV sealants are compatible with transmission fluid, so it is crucial to use a product that is suitable for this application. Additionally, some people prefer to use a gasket instead of RTV sealant to prevent leaks.
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Application techniques
While some sources advise against using RTV sealant on automatic transmission pans, others have had success with it. If you do choose to use RTV sealant, there are several techniques to ensure a good seal.
Firstly, it is important to use the correct type of RTV sealant. Some sealants are not designed for use with transmission pans, so check that the product you are using is compatible. For example, only certain types of RTV are compatible with trans fluid as the friction modifiers in trans fluid can attack RTV. Stellantis, Permatex, and Threebond all sell RTVs that are specifically designed for trans fluid.
Secondly, ensure that the surfaces are clean before applying the sealant. Any old RTV or fluid on the surfaces can affect the seal.
When applying the RTV, a small bead of sealant is recommended. A 1/8 inch bead is more than enough, and it is important not to use too much. Some suggest doing a small bead all the way around and also a bead circle around every bolt hole.
It is also important to note that RTV sealant should not be tightened with bolts all the way. Instead, only tighten the bolts finger-tight and wait for around 20-30 minutes to let it set before torquing it down.
Additionally, the Factory Service Manual recommends waiting 24 hours for the RTV to cure before exposing the sealant to hot trans fluid. This is crucial to ensuring a good seal.
It is also recommended to enlist the help of a friend or assistant to hold the pan in place while starting the bolts, to avoid smearing or scraping off the RTV.
Finally, some transmission pans have a groove or retention mechanism designed to hold the RTV in place between the two sealing surfaces. If your pan does not have this feature, the RTV may get squeezed out.
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Removal techniques
While some people recommend using RTV sealant on automatic transmission pans, others advise against it, citing potential issues such as leaks and damage to the transmission. Those who prefer gaskets argue that they are easier to work with and create a better seal.
If you decide to use RTV sealant and need to remove it later, here are some removal techniques:
- Scraping: Use a plastic or wooden scraper to remove the majority of the RTV sealant. Be careful not to scratch or deform the transmission pan or mating surfaces.
- Solvents: Clean any remaining residue with a suitable solvent, such as gasoline or brake cleaner. Ensure that the solvent is compatible with the materials of your transmission pan and mating surfaces.
- Grinding: For stubborn areas, use a bench grinder with a wire wheel to clean off the remaining RTV. Alternatively, you can use a soft wire brush attachment on a battery drill or rotary tool.
- Razor Blade: A single-sided razor blade can be used to get under the sealant, followed by a metal blade putty knife to carefully peel it away.
- Prying: Use a screwdriver to gently pry between the pan and the transmission, but be cautious not to damage the mating surfaces.
- Heat: Warming up the RTV sealant can help to soften it and make it easier to remove. However, be cautious not to apply direct heat to the transmission pan or surrounding components.
It is important to note that removing RTV sealant can be a delicate process, and it is always recommended to consult a professional or a trusted repair manual for specific instructions regarding your vehicle.
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Pros and cons of RTV sealant
RTV stands for Room Temperature Vulcanizing. It is a type of sealant that cures when exposed to room temperature air. It is a versatile material with applications in both domestic and industrial usage.
Pros of RTV Sealant
- RTV silicone is durable and long-lasting. It can withstand extreme weather changes, UV rays, and shrinking for a long time.
- It is water-resistant and can be used to seal moisture-prone areas in kitchens, tubs, sinks, and faucets.
- RTV silicone is also used as an insulator to protect electrical components from current leakages and high-temperature changes.
- RTV silicone is easy to use as it does not require extra mixing before application.
- It is adhesive and can stick two surfaces together while providing a cushion.
- RTV silicone is suitable for sealing panels, window plates, or on high-temperature equipment like oven doors.
- It is fast-drying and can be achieved in 15 minutes.
- It is aesthetically pleasing and blends easily with existing color schemes.
- It is suitable for a variety of art- and industry-related applications, including furniture, sculpture, and aviation materials.
Cons of RTV Sealant
- RTV sealant should not be exposed directly to gasoline.
- It is not paintable and should not be used on paintable surfaces.
- RTV is not widely adopted for sealing transmission pans and is considered a bad idea by some.
- Little chunks of RTV can get loose and enter valve bodies.
- RTV can be difficult to remove.
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Frequently asked questions
Yes, you can use RTV sealant on your automatic transmission pan. However, it is not recommended as it can be difficult to remove and may leak.
A good alternative to RTV sealant is a rubber gasket. This option is reusable and can be tightened with bolts.
To remove RTV sealant, you can use a plastic or metal scraper. You can also try a razor blade or a screwdriver, but be careful not to scratch the transmission mating surface.
The cure time for RTV sealant can vary depending on the manufacturer, but it typically ranges from 24 to 72 hours. It is important to let it cure completely before exposing it to any fluids.
Some recommended RTV sealant brands include Permatex, Stellantis, and Threebond. These brands offer products specifically designed for use with transmission fluid.
