Emilie Meyer
Oversized oil drain plugs are a common solution for repairing stripped oil pans, which can occur due to over-tightening or cross-threading. While some recommend replacing the oil pan entirely, others suggest that rethreading with an oversized plug is a viable and cost-effective option. This method involves using a tap to create new, larger threads in the oil pan, allowing for the installation of an oversized drain plug. It is important to grease the tap to catch any metal shavings and prevent them from falling into the oil pan. Additionally, using a rubber-lined steel washer with the oversized plug is recommended to ensure a tight seal and prevent leaks. While this repair method can be successful, it may not be accepted by all dealerships and could void future engine work guarantees.
Can you rethread an oil pan after an oversized plug?
| Characteristics | Values |
|---|---|
| Possibility | Yes, it is possible to rethread an oil pan after an oversized plug. |
| Techniques | Retapping, using a thread repair kit, drilling and tapping for a larger drain plug, using a Time-sert kit, using a universal oil drain plug, using a piggyback oil drain plug, using a rubber expanding plug, using a "Plug-in-a-plug", using a Helicoil, replacing the oil pan |
| Considerations | The oil pan should be removed to avoid metal shavings getting inside, the repair should be done correctly to prevent leaks, the oil should be drained and checked for debris, overtightening should be avoided, a backup wrench may be needed, cheap fiber washers should be avoided |
| Parts | Oversized repair drain plug, rubber-lined steel washer, thread repair kit, Time-sert kit, universal oil drain plug, piggyback oil drain plug, rubber expanding plug, "Plug-in-a-plug", Helicoil, new oil pan |
| Tools | Flat-tip screwdriver, repair tool/thread restoration tool, wrench |
| Products | GM-14090908 silicone rubber-lined washer ($18.52 for 5-pack), Dorman 097-021 or 365274 nitrile rubber-lined washer ($1.12 each), Lisle tools, Time-sert kit (sold on Amazon) |
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What You'll Learn
Using a thread repair kit to renew drain threads
Stripped thread repair is a basic skill that all mechanics should know. It is a difficult task and not typically within the realm of common repairs for an auto mechanic. However, it is a good skill to have when you need it.
Thread repair kits are available to renew drain threads. These kits come with several different thread sizes, and you should pick the repair tool with the thread size that matches your oil drain plug. Apply a few drops of lubricant to the repair tool and gently thread it into the oil drain plug hole, turning it slowly by hand. The repair tool will repair the threads as it goes.
Be careful not to let the repair tool pass completely through the oil pan drain plug hole—stay within the threaded area. Use a new oil pan drain plug (the old one may be damaged) and thread it in gently by hand to verify the repair.
You can also use an oversized drain plug, a piggyback oil drain plug, or a universal oil drain plug. However, some people have reported that oversized plugs drip and that the sharp edges of a stripped hole can damage them over time.
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Using an oversized drain plug
An oversized drain plug can be used to repair a stripped oil pan. This is a viable solution, and is much easier than replacing the oil pan. Oversized drain plugs are available at local parts stores and online.
When using an oversized drain plug, it is important to not over-torque the plug, as this can cause leaks. To prevent leaks, it is recommended to use a rubber-lined steel washer. Silicone rubber-lined washers, such as the GM-14090908, are more expensive but will last longer. It is advised to avoid cheap fiber washers, as they are only suitable for one-time use.
Some oversized drain plugs are self-tapping, meaning they cut their own threads as they are installed. These plugs work similarly to self-tapping sheet metal screws. It is important to note that self-tapping plugs may not be suitable for all applications, as they can be more difficult to remove.
When using an oversized drain plug, it is recommended to add oil to the pan and then pull the plug to allow the oil to wash out any shavings. Alternatively, a magnet can be used to remove any shavings from the pan.
While oversized drain plugs can be a quick and low-cost solution, they may not be as reliable as replacing the oil pan. Some users have reported leaks and dripping issues with oversized drain plugs. Therefore, it is important to carefully consider the advantages and disadvantages of using an oversized drain plug before proceeding with the repair.
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Using a piggyback oil drain plug
Using an oversized plug is a common solution for repairing a stripped oil pan. However, this solution has its drawbacks, as it can be difficult to remove the old plug and there is a risk of metal shavings getting into the oil pan. One way to avoid these issues is to use a piggyback oil drain plug, which is a type of oversized plug that does not require the removal of the oil pan.
A piggyback oil drain plug is a self-tapping, oversized plug that can be installed without removing the oil pan. It has an external thread that cuts into the damaged thread of the oil pan, creating a new, secure thread. The piggyback plug typically has a smaller inner bolt that can be removed for oil changes, leaving the outer threader in place. This reduces the risk of further damaging the oil pan threads.
When installing a piggyback oil drain plug, it is important to use the correct size tap and to ensure that the plug is tightened securely, but not overtightened. A washer can also be used to create a better seal and prevent leaks. In some cases, a gasket or O-ring may be required for the smaller inner bolt.
One example of a piggyback oil drain plug is the DEEFILL M14.1-1.25 x 15mm Oversize Piggyback Oil Drain Plug, which is made of stainless steel and is available as a self-tapping oil pan thread repair kit. This product has received positive reviews for its ease of installation and effectiveness in sealing the oil pan.
Overall, using a piggyback oil drain plug can be an effective and cost-saving solution for repairing a stripped oil pan, as it avoids the need to replace the oil pan or use more complex repair methods. However, it is important to follow the installation instructions carefully and to monitor the plug for any signs of leaks or failure over time.
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Drilling and tapping the drain hole for a larger plug
To begin the process, use a centre punch or a nail to mark the location of where you want the hole drilled. This will help keep the drill bit from "walking" as you start drilling. You will need to tap a 1/8-27 NPT fitting, and the recommended drill bit size is 21/64", which can be found in many hardware stores. If you want to be extra careful, you can drill small holes that are incrementally larger until you reach the desired size.
Once you have the correct drill bit, start drilling the hole. As the drill breaks through the housing, the oil will begin to drain, and you can catch it in an oil catch basin. It is important to use a magnet to ensure that all the metal shavings are removed from the oil as it drains. You can also use a pipe tap to help remove the shavings as you go. Back the tap out frequently to remove as many shavings as possible.
After the hole has been drilled and tapped, it is time to install the new drain plug. Do not use extreme torque to seal the pipe plug properly, as you do not need to add a lot of force. Install a magnetic plug for extra protection and use a socket head plug to finish. Finally, you can add new oil and any necessary additives to ensure the best quality plug.
While drilling and tapping the drain hole for a larger plug can be an effective repair method, it is important to note that some dealerships may not service vehicle engines with oversized plugs. Additionally, there is a risk of oil leaks if the plug is not installed correctly. Therefore, it is recommended to seek professional assistance or consult a mechanic before attempting any repairs.
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Using a universal oil drain plug
A universal oil drain plug can be used as a fix for a previously stripped drain plug. However, it is not designed for re-usability, and the right fix is to swap the pan.
If you are looking for a quick oil drain plug, No-Spill Systems offers a range of drain plugs that can be used with either gravity or suction systems. Their products are guaranteed for life and are designed to make your life easier by keeping things clean and simple. The stainless steel, spring-loaded valve stays securely closed until you are ready to drain the oil. Attaching the No-Spill drainer to the plug automatically seals it, allowing the valve to open and the oil to drain out smoothly and precisely through a hose.
Another option is to use a self-tapping oversized drain plug. These are available at local parts stores and can be screwed in. It is important not to over-torque them to avoid leaks. It is also recommended to use a rubber-lined steel washer.
If you are looking for a more permanent repair, you can use a "Plug-in-a-plug" type of plug. With this type of plug, the threads in the oil pan won't continue to be stressed by the removal of an oversized plug, as only the centre plug is removed. Once the plug is tapped, it is best to put the plug in, add a quart or so, pull the plug, and let the oil wash any shavings out.
Alternatively, you can use a Helicoil to repair the threads and then install a Fumoto oil drain valve. You can also seal the threads to prevent possible leaks.
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Frequently asked questions
You can either replace the oil pan, or rethread it with a slightly larger thread and bolt. You can also use a self-tapping oversized drain plug, a thread repair kit, a universal oil drain plug, or a piggyback oil drain plug.
The best method is to replace the oil pan. However, this can be expensive and time-consuming, as it may require dropping the sub-frame and messing with the motor mounts. Oversized drain plugs are a viable repair option, but they may not be accepted by some dealerships.
You can purchase an oversized repair drain plug at any local parts store and screw it in. It is important not to over-torque the plug, as this can cause leaks. It is also recommended to use a rubber-lined steel washer, as cheap fiber washers absorb oil and are for one-time use only.
