Tillie Doyle
Welding an auto transmission pan can be a tricky task. While some people might suggest using a sealant or JB weld to repair a puncture in the pan, this is not a permanent solution as it can break loose due to heat or vibration. The best approach is to seek the help of a competent welder who can repair the pan and check it for leaks. Additionally, it's important to consider the type of welding technique and equipment used, such as TIG welding for aluminum pans, to ensure a strong and durable weld. In some cases, adding a drain plug or kit might be necessary, but it's always recommended to consult with professionals to avoid further complications.
How to Permanently Weld Auto Transmission Pan
| Characteristics | Values |
|---|---|
| Materials | JB Weld, Sealant, Hammer, Sandpaper, Copper Washer, Nylon Washer, Aluminum Washer, Rubber Gasket, Silicone, RTV, Propane Torch, Pry Bar, Wood |
| Steps | 1. Hammer down the puncture and smoothen it. 2. Sand the transmission pan. 3. Use JB Weld. 4. Check for leaks. 5. Weld a nut to the inside of the pan. 6. Drill a hole. 7. Use a magnetic drain plug. 8. Add magnets. 9. Use a copper or nylon washer. 10. Use a rubber gasket with or without RTV. 11. Apply heat with a propane torch. 12. Use a pry bar and wood for leverage. |
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What You'll Learn
Welding an ATF drain plug bung onto the pan
Step 1: Remove the Pan
Remove the transmission pan from your vehicle. This step is crucial as it provides access to the area where you will be welding.
Step 2: Prepare the Bung
Choose the appropriate bung for your application. You can purchase a universal weld-in drain plug bung that can be welded onto any surface. Alternatively, you can use a brass reducer fitting, which has the advantage of a lower profile and is more affordable.
Step 3: Drill a Hole
Determine the correct location for the drain bolt, ensuring it won't interfere with any internal components. Mark the spot and drill a hole. The hole should be sized appropriately for your chosen bung. For example, a 1-3/8" hole is recommended for a universal weld-in drain plug bung.
Step 4: Weld the Bung
Weld the bung into the drilled hole. This step requires careful execution to ensure a strong and leak-proof weld. TIG welding is recommended for this task, especially if you are welding onto a steel pan. If you are welding an aluminium pan, TIG welding is still possible but seek out an experienced welder or shop to ensure a safe and effective weld.
For the welding process, consider the type of nut you will be using:
- Inside Nut: Welding the nut inside the pan provides a larger sealing surface and protects it from road debris. However, it may result in less fluid being drained.
- Outside Nut: Welding the nut outside the pan allows for easier access if rewelding is needed due to leaks. It also allows for more fluid to be drained.
Step 5: Seal and Test
Use appropriate sealing methods, such as a copper washer, a nylon washer, or a bolt with a built-in rubber O-ring. After assembling the drain plug, test for leaks and ensure that the weld is secure and effective.
Plan B
If you are not confident in your welding skills, consider seeking professional help. A blown weld can lead to a messy situation and costly repairs. It is better to be cautious and consult experienced welders or mechanics if you have any doubts.
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Using a gasket in place of silicon
When it comes to transmission pan gasket replacement, there are differing opinions on whether to use a gasket sealant or not. Some prefer to use a flat gasket style without any sealant, as it makes removing the pan later much easier and prevents the need for cleaning the pan and transmission. This method involves ensuring that the mating surfaces on either side of the gasket are clean, dry, and degreased, and then torquing down the bolts in the proper sequence.
Others have used sealants like Permatex Ultra Black or K&W Copper Coat with no issues. In these cases, a thin layer of sealant is applied to both sides of the gasket, and then the gasket is installed. Some prefer to glue the gasket to the pan using bolts to align it and keep the other side dry. This method is preferred when the transmission requires regular fluid changes, as sealants can sometimes cause the pans to bend when being pried off, requiring the use of a hammer to flatten them out.
It is important to note that some gasket glues or sealants may not be suitable for all types of transmissions, as transmission fluid can eat through certain materials. Additionally, over-tightening the pan bolts should be avoided, as this can cause leaks.
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Removing a welded-on transmission pan
Step 1: Prepare the Vehicle
Place a drain pan or container under the transmission oil pan to catch any fluid that may leak during the removal process. This is crucial to avoid spilling transmission fluid onto your driveway or garage floor. Make sure to have some old towels or rags handy to wipe up any spills or leaks.
Step 2: Loosen the Pan Bolts
Using the appropriate tools, loosen the pan bolts that secure the transmission pan to the vehicle. Depending on the vehicle model, you may only need to loosen the rear bolts first and then remove the remaining bolts once the pan is tapped loose. Be careful not to strip the threads of the bolts during this process.
Step 3: Tap the Pan to Break it Loose
Use a rubber hammer or mallet to gently tap on the corners of the transmission pan. This will help break the seal and loosen the pan from the vehicle. Be careful not to use excessive force, as you don't want to damage the pan or the surrounding components.
Step 4: Allow Fluid to Drain
Once the pan is loose, carefully tilt the pan to allow the transmission fluid to drain into the drain pan below. This step is crucial, as you don't want the fluid to spill everywhere when you remove the pan. Make sure to dispose of the fluid responsibly at a designated location or recycling center.
Step 5: Remove Remaining Bolts and the Pan
After the fluid has drained, remove the remaining bolts and carefully lift the transmission pan out of the vehicle. Be cautious, as the pan may still have some residual fluid. Place the pan aside, preferably on a flat surface, to avoid spilling any remaining fluid.
Step 6: Clean and Inspect the Area
With the transmission pan removed, take the opportunity to clean the area and inspect for any damage or leaks. Look for any signs of gasket material or residue left behind. Use a putty knife, brake cleaner, and towels to provide a clean surface for the new pan. Check for any signs of damage or wear on the vehicle's components, such as the filter and O-ring, and replace them if necessary.
Tips and Precautions:
- Always refer to a reputable repair manual or seek advice from a professional mechanic if you are unsure about any steps or procedures.
- When dealing with transmission fluid, be cautious as it can be extremely hot. Allow sufficient time for the fluid to cool down before handling.
- Wear protective gear, such as gloves and eye protection, to safeguard against any fluid spills or debris.
- If you are unable to find a suitable replacement pan, consider contacting salvage yards or auto parts stores for alternatives.
- In some cases, it may be more cost-effective to replace the entire transmission assembly rather than just the pan.
By following these steps and precautions, you can successfully remove a welded-on transmission pan and ensure a safe and efficient repair or replacement. Remember to take your time, work carefully, and always prioritize your safety when working on your vehicle.
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TIG welding an aluminium pan
TIG welding is a suitable method for welding an aluminium transmission pan. However, welding aluminium presents some challenges, such as controlling heat input and dealing with the oxide layer. Aluminium is highly conductive, so the heat of the weld puddle can be quickly pulled away.
To weld an aluminium transmission pan, you will need to follow these steps:
- Clean the area to be welded thoroughly. Ensure that the surface is free of any debris, grease, or contaminants.
- Preheat the aluminium pan to a suitable temperature to prevent cracking during the welding process. This can be done using a blow torch or a furnace.
- Set up your TIG welder with the appropriate settings for aluminium welding. Use a modern welding power source that allows you to adjust the AC output frequency. Higher AC output frequencies result in a tighter, narrower arc column, providing more directional control.
- Use a shorter arc length to help localize the heat to a small area and prevent a runaway puddle.
- Begin welding, ensuring proper penetration before adding filler metal.
- Add filler metal gradually to achieve the desired weld appearance. Achieving the coveted "stacked-dimes" look when welding aluminium requires practice and skill.
- Allow the weld to cool slowly, as rapid cooling can cause cracking.
It is important to note that welding an aluminium transmission pan requires skill and experience. If you are not confident in your welding abilities, it is recommended to seek the help of a professional welder or a specialised welding shop.
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Using JB Weld to repair a puncture in the pan
JB Weld can be used to repair a puncture in an auto transmission pan, but it is not recommended as a long-term solution. While some people have had success with this method, others have experienced failures after a few days, resulting in the loss of transmission fluid and costly repairs.
If you decide to use JB Weld as a temporary fix, here is a general step-by-step guide based on suggestions from online forums:
- Drain the oil from the transmission pan.
- Clean and prepare the puncture area: Remove any loose or flaked paint, rust, or debris around the puncture using tools such as a wire brush, sandpaper, or an angle grinder with a wire brush cup wheel.
- Hammer down the puncture to smoothen it out.
- Apply JB Weld: Spread the JB Weld evenly over the affected area. Ensure that you follow the instructions on the JB Weld packaging for proper application.
- Cover with tape: Immediately cover the JB Weld with a piece of aluminum auto body repair tape or aluminum tape. This will help contain the JB Weld and prevent it from flowing onto the ground.
- Allow it to cure: Follow the manufacturer's instructions for curing time. Some users recommend allowing it to cure for at least 24 hours to ensure it is fully hardened.
- Refill and test: After the curing process is complete, refill the transmission pan with oil and test the repair by taking a short drive.
It is important to monitor the repair closely if you choose to use JB Weld. Check the transmission pan daily for any signs of failure or leaks. Keep in mind that this is not a permanent solution, and you may need to seek a more durable repair option, such as welding or replacing the transmission pan, in the long run.
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