Cody Casey
RTV is a type of sealant used in automotive engineering to prevent leaks. It is used in place of or in conjunction with a gasket, depending on the type of gasket and the design. It is oil-resistant and can withstand coolant, steering fluid, and shop fluids. It is also used to bond two types of metal together. It is available in different colours, including black, grey, and ultra grey. Black RTV can be used on transmission pans, as can other types of RTV. However, some people prefer to use a gasket, as RTV can be difficult to remove and may require a pry bar, screwdriver, or hammer to separate the pan from the block.
Can I use black RTV on the transmission pan?
| Characteristics | Values |
|---|---|
| Use case | Sealing transmission pans, oil pans, and gaskets |
| Temperature range | -65ºF to 500ºF (-54°C to 260°C) intermittent |
| Resistance | Resists auto and shop fluids, vibration, ATF, coolant, oil, and other shop fluids |
| Curing time | Initial tack-free cure time: 30 minutes to 2 hours |
| Fully cured to design strength: 24 to 72 hours | |
| Application method | Apply to the pan, let skin over for 15 minutes, clean the sealing face, then apply the pan without moving it around |
| Tighten bolts to 2-3 ft lbs, let cure for 2 hours, then finish torquing to the specified torque | |
| Pros | Oil-resistant, can withstand coolant, can flex to ten times its original shape |
| Cons | Difficult to remove, may require a pry bar, screwdriver, or hammer to break the seal |
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What You'll Learn
Using black RTV to prevent transmission pan leaks
RTV, or room-temperature vulcanizing rubber, is a type of sealant used in automotive applications. It is designed to resist oil, coolant, and other fluids, making it ideal for use in engines and transmissions. RTV is available in various colours, each designed for specific applications.
Black RTV, also known as Optimum Black or Ultra-Black, is a type of RTV sealant that is commonly used in high oil contact areas, such as oil pans and transmission pans. It is designed to provide maximum oil resistance and can withstand temperatures ranging from -54°C to 260°C. Black RTV is also flexible, allowing it to bond two different types of metal together effectively.
When using black RTV to prevent transmission pan leaks, it is important to follow the correct procedure. First, ensure that the transmission pan and sealing surface are clean and free of any old gasket material or debris. Apply the black RTV to the pan, ensuring that it is spread evenly and that there are no gaps or thin areas. Allow the RTV to skin over for approximately 15 minutes.
Next, position the transmission pan in place, being careful not to move it around once it is in position. Tighten the pan bolts to the specified torque settings, typically in a criss-cross pattern from the inside out. Finally, allow the RTV to cure for at least two hours before finishing torquing to the manufacturer's specifications.
It is important to note that while black RTV can be an effective solution for sealing transmission pans, it should not be used as a substitute for a proper gasket. Some transmission pans may not require RTV at all, so it is important to refer to the manufacturer's instructions or a mechanic for guidance. Additionally, when working with RTV, ensure that you are in a well-ventilated area and wear appropriate protective gear, such as gloves and eye protection.
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Removing the transmission pan
Firstly, it is important to prepare the area you will be working in. Place a decently-sized pan under the transmission pan to catch any fluid that may leak out during the removal process. This will help to minimise the mess created. Loosen the bolts at one corner of the transmission pan first, and then work your way towards the opposite corner. This will allow you to tilt the pan and drain the fluid out from one corner, rather than letting it leak out all around.
Once the bolts are loose, you can carefully remove them, ensuring that you keep track of them as you go. It is important to note that the bolts may not all be the same length, so it is crucial to remember where each bolt came from to ensure proper replacement. With the bolts removed, you can now carefully lift and remove the transmission pan. Be cautious, as there may still be some fluid inside the pan that could spill.
At this stage, it is a good idea to inspect the gasket on the transmission pan. Check for any tears or damage and ensure that the gasket is not over-tightened or pushed up from the bolts. If the gasket is in poor condition, it may need to be replaced.
If you are planning to reuse the gasket, it is important to clean it thoroughly before reinstalling the transmission pan. You can use a paper towel sprayed with brake cleaner or a similar product to wipe down the gasket and remove any residue or contaminants.
Finally, before reinstalling the transmission pan, refer to the automaker's or gasket manufacturer's instructions for any specific requirements or directions. Some gaskets may require the use of a sealer, while others may not. Always follow the directions provided to ensure a proper seal and avoid leaks.
By carefully following these steps, you can successfully remove your transmission pan and minimise the risk of leaks or other issues.
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Removing black RTV sealant from the transmission pan
Removing black RTV sealant from a transmission pan can be a tricky process. Here are some detailed steps to guide you through the process:
Preparation
Before beginning the removal process, it is important to gather the necessary tools and materials. These include a plastic or wooden scraper, a soft wire brush attachment for a drill or rotary tool, brake cleaner or gasoline, rags, and safety gear such as gloves and eye protection. Ensure you have a well-ventilated workspace and that you are wearing appropriate safety gear to avoid any injury or inhalation of fumes.
Removal Process
- Begin by cleaning any residue from the transmission pan and magnet. This step is crucial to ensure that no dirt or contaminants interfere with the removal process.
- Using the plastic or wooden scraper, carefully remove the old RTV from the transmission case rails and other surfaces. Be cautious when working with aluminum components, as they are susceptible to metal transfer when the gasket material is removed.
- For more precise cleaning, use the soft wire brush attachment on your drill or rotary tool to access tight spaces and thoroughly clean all surfaces.
- Once the majority of the RTV has been removed, wipe down the surfaces with brake cleaner or gasoline and a clean rag to eliminate any remaining residue.
- Inspect the transmission pan for any dents or damage. If the pan is severely damaged, it may be more cost-effective to replace it entirely.
- If reusing the transmission pan, ensure that the surface is flat and free of any warping or irregularities that could cause leaks once the pan is reinstalled.
Reinstallation
After removing the RTV sealant and ensuring the transmission pan is clean and undamaged, you can begin the reinstallation process. This typically involves applying a new gasket or sealant and following the manufacturer's instructions for torque specifications and curing times.
It is important to note that the above process is a general guide, and specific steps may vary depending on your vehicle's make and model. Always refer to your vehicle's repair manual or seek advice from a qualified mechanic if you are unsure about any steps in the removal or reinstallation process.
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Using a gasket with black RTV
Using black RTV on a transmission pan is a common practice, and it can be an effective way to seal the pan and prevent leaks. RTV, or Room Temperature Vulcanization sealants, come in various types, colours, and formulations for different applications. Black RTV is commonly used due to its higher temperature rating compared to other colours.
When using a gasket with black RTV, it is important to follow the correct procedure to ensure a proper seal and avoid damage to the gasket. Firstly, clean the transmission pan thoroughly to ensure there is no residue or contamination on the surface. This can be done using a paper towel sprayed with brake cleaner or a degreaser like Windex.
After cleaning, apply a small amount of black RTV to the corners of the gasket and/or stepped casting areas that have gaps. Do not apply RTV to the entire gasket, as it can act as a lubricant and cause the gasket to slip out of place. Uncured RTV can also put more compression on the gasket than it is designed to handle.
Once the RTV is applied, install the gasket and the transmission pan within five minutes. Finger-tighten the bolts and snug them up, ensuring that the gasket moves slightly into position. The RTV needs time to set up and dry, so do not rush the job. RTV typically requires 24 hours for a full cure, but initial tack-free cure times can range from 30 minutes to 2 hours, depending on the manufacturer.
It is important to consult the repair manual or the manufacturer's instructions for specific directions on where and how much RTV should be applied, as applying RTV in the wrong areas can cause permanent damage to the gasket. Additionally, some manufacturers may have specific recommendations or cure times for their products.
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Alternatives to black RTV
While RTV is a popular choice for sealing transmission pans, there are several alternatives available that can provide effective sealing and prevent leaks.
One alternative is to use a gasket, specifically a good-quality rubberized composition gasket. Gaskets come in various materials, including rubber, cork, steel, and neoprene. Some gaskets are also reusable, making them a cost-effective and convenient option. It is important to ensure that the gasket is properly aligned and not over-tightened to avoid leaks.
Another option is to use a product called "The Right Stuff" or Permatex® The Right Stuff® Gasket Maker. This product is an elastomeric rubber gasket technology that is blowout resistant and provides quick results, forming leak-proof gaskets in just one minute. It is specified by leading automobile manufacturers like GM, Ford, Chrysler, and Mercedes-Benz.
In addition to these alternatives, some people have shared their experiences with using other products like Permatex Ultra Black, Permatex High Tack Spray-A-Gasket, and Mahle cork gasket.
When deciding between RTV and alternatives, it is essential to consider the specific application, the type of transmission pan, and personal preferences. While RTV is widely used and effective in many cases, some people prefer the convenience and reliability of gaskets or the quick sealing offered by alternative products.
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Frequently asked questions
Yes, black RTV can be used on a transmission pan. RTV is used for the gasket material for OEM assembly out of the factory.
Clean the transmission pan thoroughly. Apply RTV to the pan only, and immediately before installing, yank off any residue. Fit the pan straight away.
Black RTV is oil-resistant and can withstand coolant and steering fluid. It is also flexible and can be used for bonding two types of metal together.
