
A helicoil is a metal coil that replaces the oil drain plug thread. It is a less intrusive method of repairing a damaged drain plug thread, and it is also more cost-effective than purchasing a new oil pan. The repair process involves drilling out the drain hole, tapping new threads into the pan, and installing the helicoil. While some consider helicoils to be a permanent fix, others have experienced issues with helicoils breaking or becoming stripped. In such cases, a metal insert called a time-sert may be required, although time-serts have been known to cause sealing issues.
Can you fix an oil pan drain plug with a helicoil?
| Characteristics | Values |
|---|---|
| What is a helicoil? | A metal coil that replaces the oil drain plug thread. |
| What is it used for? | To fix a damaged or stripped-out oil drain plug hole. |
| How is it installed? | The drain hole must be drilled out, then a tap included with the helicoil kit is used to make new threads in the pan. After the threads are tapped, the helicoil can be installed, and a new drain plug can be used. |
| What are the benefits? | The repair yields a threaded hole that is 5 to 10 times stronger than the original. It is also a less intrusive and more cost-effective method than replacing the entire oil pan. |
| What are the drawbacks? | If the helicoil is installed incorrectly, it can fail and come out in pieces when the plug is tightened. An overzealous mechanic can strip out a helicoil, requiring a larger repair. |
| What are the alternatives? | Time-serts can be used for the same type of repair, but they can be problematic as they may not seal properly and can come out with the drain plug. |
| What about the drain plug? | It is recommended to use an OEM plug or a Turner brand plug, as they are known to fit well. Using a plug that is too small may result in a poor fit. |
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What You'll Learn

A helicoil repair is a permanent fix
To install a helicoil, the drain hole must be drilled out to an oversized dimension. A tap that comes with the helicoil kit is then used to create new threads in the pan. Once the threads are in place, the helicoil can be installed. After the installation, a new drain plug can be used.
The quality of the repair and its longevity depend on the installation process. However, when properly installed, the helicoil repair yields a threaded hole that is 5 to 10 times stronger than the original. It is also almost strip-proof.
Helicoils have been used since World War II on aluminium aircraft engines. They are commonly used in Porsche engines and are known to provide a better outcome than time-serts. Time-serts can cause oil leaks if the shoulder at the top is too large for the crush washer to cover. Additionally, time-serts often come out with the drain plug, whereas helicoils do not back out.
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The repair is better than new
A helicoil repair is a great way to fix a damaged oil pan drain plug. It is a simple, cost-effective, and permanent solution that can be better than a new oil pan. The helicoil is a metal coil that replaces the oil drain plug thread. It is a less intrusive method of repair and, once installed, the hole is almost strip-proof. The repair yields a threaded hole that is 5 to 10 times stronger than the original.
The process of installing a helicoil is straightforward. First, the drain hole must be drilled out to size, and then a tap, included with the helicoil kit, is used to create new threads in the pan. After tapping the threads, the helicoil can be installed, and a new drain plug can be used. The quality of the repair depends on proper installation, so it is important to have the right tools and equipment or find a good mechanic or machinist to help.
The helicoil repair has several advantages over other methods. It is a more viable and affordable option than buying a new oil pan, which can be costly. Helicoils have been used successfully since WWII on aluminum aircraft engines, and are also commonly used in Porsche engines. They are a more reliable solution than oversized drain plugs, which often lead to future issues.
Additionally, compared to Time-Serts, another type of repair, helicoils are less likely to cause oil leaks. Time-Serts can be problematic if the shoulder at the top is too large for the crush washer, allowing oil to leak out. Helicoils also do not back out, whereas Time-Serts can sometimes come out with the drain plug. While some people express skepticism about helicoils, the evidence suggests that they are a highly effective and durable solution for repairing damaged oil pan drain plug threads.
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The repair is strip-proof and 5-10 times stronger
A helicoil is a metal coil that replaces the oil drain plug thread. The repair process involves drilling out the drain hole to make it oversized, then using a tap (included in the helicoil kit) to create new threads in the pan. Once the threads are tapped, the helicoil can be installed, and a new drain plug can be used.
The quality of the repair and its longevity depend on the proper installation of the helicoil. It is important to ensure that the fresh hole that takes the insert is drilled clean and square. With careful installation, a helicoil repair can be a good, long-lasting solution that is stronger than the original thread.
While a helicoil repair is strong, it is not indestructible. An overzealous mechanic can strip out a helicoil, and in this case, the hole may be too big for another helicoil repair. Therefore, it is important to be careful during the installation process and not over-tighten the helicoil.
In summary, a helicoil repair on an oil pan drain plug can be a viable and cost-effective option compared to replacing the oil pan. When installed correctly, the repair is strip-proof and 5-10 times stronger than the original thread, providing a durable and reliable solution.
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Time-serts are problematic
Helicoils have been used successfully since WWII on aluminium aircraft engines, and are employed extensively in Porsche engines. They are a proven solution for repairing stripped oil drain plug holes, and the repair yields a threaded hole that is 5 to 10 times stronger than the original.
The helicoil repair process involves drilling out the drain hole to an oversized dimension, then using a special tap included with the helicoil kit to create new threads in the pan. After tapping, the helicoil can be installed, and a new drain plug can be used. This repair method is less intrusive than a time-sert repair and provides a stronger and more secure result.
While some professionals may express negative opinions about helicoils, the evidence suggests that they are a superior option to time-serts for repairing stripped oil drain plug holes. Helicoils provide a stronger and more reliable repair, and the risk of stripping is minimal when installed correctly. Time-serts, on the other hand, have inherent design issues that make them more prone to failure and oil leaks. Therefore, when faced with the choice between a helicoil and a time-sert repair, the helicoil is the recommended and preferred option.
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A helicoil kit includes an insert, tap and sometimes a drill bit
A helicoil kit is used to repair damaged threads in various materials, including metals, plastics, and wood. The repair process is quick and efficient, making it a cost-effective solution for industrial and automotive applications. The helicoil kit includes the following:
- Insert: The core component of the kit is the helicoil insert, a coiled wire usually made of stainless steel. It creates a stronger bond than the original thread and is available in various sizes, making it versatile for different applications.
- Tap: The kit includes a tap that cuts new threads in the pre-drilled hole, preparing it to accept the helicoil insert. This step ensures a precise and secure fit for the insert.
- Drill Bit: Some helicoil kits include a specific drill bit precisely sized to prepare the hole for tapping. The drilling ensures the hole matches the correct diameter required for the new threads. If a drill bit is not included, the kit will specify the size needed.
- Installation Tool: This tool helps screw the helicoil insert into the freshly tapped hole, ensuring smooth and accurate installation to the proper depth.
The repair process involves drilling, tapping, inserting the helicoil, and breaking off the tang. This straightforward process can be performed by professionals and amateurs alike, making it a versatile solution for different industries, including automotive, aerospace, and electrical engineering.
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Frequently asked questions
A helicoil is a metal coil that replaces the oil drain plug thread.
To install a helicoil, the drain hole must be drilled out, then a tap included with the helicoil kit is used to make new threads in the pan. After the threads are tapped, the helicoil can be installed.
A helicoil repair is the least intrusive method to fix a damaged drain plug hole and is better than new. The repair yields a threaded hole that is 5 to 10 times stronger than the original.
Yes, an oversized drain plug can be installed. However, this is not recommended as they tend to have future issues. Another alternative is a metal insert called a "time-sert", but these are known to cause sealing issues.
It is important to have all the necessary tools and equipment to install a helicoil. If you are unsure, it is recommended to consult a professional mechanic to avoid further damage to the oil pan.








































