Emilie Meyer
Sealing a transmission pan can be a tricky task. While some suggest using a gasket sealant like RTV, others warn against it as it can cause leaks and create more work during future maintenance. The recommended approach is to use a gasket, either rubber or composite, without any sealant. This method is supported by many car enthusiasts and mechanics, ensuring a proper seal and avoiding potential issues with the transmission. The process involves removing the transmission pan, cleaning the surfaces, installing the gasket, and tightening the bolts securely without overtightening.
How to Permanently Seal Auto Transmission Pan
| Characteristics | Values |
|---|---|
| Removing the transmission pan | It is not possible to seal the transmission pan without removing it. |
| Sealant | Sealants such as RTV, Indian Head Gasket Sealer, and Hondabond can be used to seal transmission pans. |
| Gasket | A gasket can be used instead of a sealant, and is preferred by some mechanics. Gaskets can be made of rubber or composite materials. |
| Tightening bolts | It is important to not over-tighten the bolts, as this can cause leaks. |
| Surface preparation | Surfaces should be cleaned and dried before applying sealant or installing a gasket. |
| Drain plug | Installing a drain plug can make future fluid changes easier. |
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What You'll Learn
Removing the transmission pan
First, it is crucial to drain the fluid from the pan. Place a large pan or container underneath the transmission pan to catch the fluid. Loosen all the bolts on the pan, but keep the front bolts tighter to allow the fluid to drain from one side of the pan. Ensure that you do not over-tighten the bolts as this can cause leaks and damage the housing.
Once the fluid is drained, remove all the bolts. Be cautious of any bolts that may be difficult to access, especially near the exhaust pipe, as these can be challenging to remove. After all, the bolts are out; you can try to gently pull down on the pan to remove it. If it is stuck, do not force it, as you may damage the pan or the transmission.
If the pan is stubborn and won't come off easily, there are a few techniques you can try. One method is to use a thin but sturdy tool, such as a paint scraper or putty knife, and gently tap it between the pan and the transmission. You can also try using a razor blade to lightly cut away at any sealant or residue holding the pan in place. Be cautious not to damage the transmission or the pan during this process.
Another technique is to use a rubber mallet and gently hit the pan a few times to loosen it. If the pan still won't come off, you may need to use a mini pry bar. Apply leverage against the lip of the pan by prying back against the transmission. Be cautious when using a pry bar, as it may damage the soft aluminium surface.
Finally, once the pan is removed, clean it thoroughly with brake cleaner or a similar solvent. Ensure that all old residue and fluid are removed from the pan and the transmission surface. You can use a gasket scraper to remove any remaining gasket material or sealant.
Remember to work carefully and patiently when removing the transmission pan to avoid any damage to your vehicle. Always refer to your vehicle's repair manual for specific instructions and safety precautions.
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Cleaning the transmission pan
To clean the transmission pan, it is recommended to use a solvent to clean the metal. Transmission fluid can be wicked with a solvent. However, it is important to note that you should not use any cleaner on the inside of the pan as per some recommendations.
Firstly, warm up your vehicle by driving it around for a few minutes. Draining the fluid will be faster when the fluid is warm. Be cautious when working with hot vehicle components, especially the exhaust system. Always work on a flat, even surface. Place the vehicle in park, engage the parking brake, and block the rear wheels before raising the vehicle. Use your owner's manual to find a suitable jacking point and elevate the vehicle high enough to clear your jack stands.
Remove the transmission oil pan and clean it inside and out. Automatic transmissions are highly sensitive to dirt and foreign matter. To clean the outside of the pan, use a degreaser, and to clean the inside and the gasket mating surfaces, use brake cleaner. Carefully remove all the gasket material from the transmission oil pan and the mating surface on the transmission. A razor blade may be useful for this step. Most transmissions have a magnet in the pan to catch small metal particles. Wipe the magnet with a rag and reinstall it.
Additionally, clean the bolts that secure the oil pan to the transmission. Remove and replace the transmission filter, which is typically located on the bottom of the valve body and becomes visible once the transmission oil pan is removed. Pay attention to the location and orientation of the clips or bolts.
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Using a gasket
The gasket should be made of a tough material, such as rubber or composite, and should not be a cork gasket as these can split easily. It is also important to avoid over-tightening the bolts as this can cause leaks. Instead, tighten the bolts in steps up to a final torque of 13lb/ft.
Some people choose to use a sealant in addition to the gasket. However, this is not necessary and can create more work for future maintenance. If you do use a sealant, it is important to ensure that it does not get inside the transmission pan as it can stop up solenoid valves.
It is recommended to use a catch pan to collect any fluid that may drip during the process. This can be a messy job, so it is important to have plenty of old rags or paper towels on hand.
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Using a sealant
If you decide to use a sealant, there are several options available. One popular option is to use a gasket sealant, such as the Felpro gasket, which is available at AAP for $5. It is thick, firm, and does not require any additional sealant. Another option is to use a rubber gasket, which typically does not require a sealant unless the mating surfaces are damaged. In this case, you can use a sealant like Permatex "Ultra Grey" or "The Right Stuff GREY".
When applying a sealant, it is important to ensure that the surfaces are clean and free of any old RTV or transmission fluid. You can use a solvent to clean the metal, but be aware that transmission fluid wicks readily. You can also use brake clean to degrease the mating surfaces. It is recommended to apply the sealant in a thin layer and follow the dry time instructions to ensure it cures properly.
Some people have used Indian Head Gasket Sealer with success. It is cheap and available at any auto parts store. However, it is important to be careful not to use too much sealant, as it can goop up and cause issues. Additionally, it is advised to avoid using RTV on automatic pan gaskets, as it can stop up solenoid valves if it gets inside.
Overall, while using a sealant can be an option to seal an auto transmission pan, it is important to follow the instructions carefully and ensure the surfaces are clean and dry for the best results.
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Tightening bolts
When tightening the bolts of your transmission pan, it is important not to over-tighten them. Over-tightening the bolts can cause leaks by crushing the gasket or stripping the threads out of the aluminium housing.
To avoid over-tightening, tighten the bolts incrementally in steps until you reach a final torque of 13lb/ft. You may need to go an extra quarter turn on the bolts to stop any drips.
Before tightening the bolts, it is recommended to clean off the lip of the pan and ensure that the mating surfaces are dry. You can use brake cleaner to degrease the mating surfaces and a paper towel to soak up any excess fluid.
Additionally, when tightening the bolts, you can use a speed wrench to get all the bolts slightly snug, and then go around once or twice with a torque wrench to get the bolts to the correct specification.
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Frequently asked questions
The most commonly recommended sealants are RTV, Indian Head Gasket Sealer, and Hondabond.
The most highly recommended RTV is the Chrysler RTV Gray, also known as Mopar ATF-RTV.
Yes, you can use a gasket. Gaskets are available in rubber or composite materials.
Gaskets can be purchased from auto parts stores such as AAP, AZ, or NAPA.
First, remove the transmission pan and clean the mating surfaces. Then, install the gasket and tighten the bolts. Do not overtighten the bolts, as this can cause leaks.
