Tapping Oil Pan: A Guide To Drilling For Oil Return

Tapping an oil pan is a process of creating female threads in a punched hole. It is usually done to secure a hose barb fitting for an oil drain line. While it is recommended to remove the oil pan before tapping, it is possible to tap the oil pan while it is still on the car. This process requires extra caution to avoid metal shavings from getting into the oil pan, which can cause engine damage. Techniques to minimise shavings include using lots of grease, drilling slowly and wiping the bit often, using a vacuum or an air hose to remove shavings, and changing the oil multiple times after tapping to flush out any remaining shavings.

Removing the oil pan

Firstly, you need to identify the location of the oil pan. The oil pan is usually located at the bottom of the engine, and it can be accessed by jacking up the car and removing the underside panels. Once you have located the oil pan, place a drain pan or container underneath it to catch any dripping oil.

Next, you will need to remove the oil drain plug, which is usually located at the bottom of the oil pan. Have a helper hold the drain pan as you remove the plug, as oil will begin to drain out. Allow the oil to drain completely before proceeding.

Now, you can start removing the bolts that secure the oil pan to the engine. These bolts may be difficult to access, so you may need to use a socket wrench or a ratchet with an extension. Place the removed bolts in a safe place so they do not get lost. Once all the bolts are removed, the oil pan should be loose.

With the oil pan loose, you can now carefully remove it from the engine. This may require some wiggling and maneuvering, as there may be other components in the way. Be careful not to damage any nearby parts or the oil pan itself. Once the oil pan is removed, set it aside in a clean area.

Before reinstalling the new oil pan, it is important to clean the mounting surface on the engine and inspect it for any debris or damage. Also, clean the old gasket material from the sealing surface of the oil pan and the engine block. Ensure that the new oil pan gasket is properly aligned and seated before bolting the new oil pan into place.

Tighten the bolts securely, following the manufacturer's torque specifications and bolt-tightening pattern. Reattach any other components that were removed during the process. Finally, add new oil to the engine according to the manufacturer's specifications, and check for any leaks.

Drilling and tapping the oil pan while it's still on the car

• Use lots of grease: Coat your drill bit and tap with grease to help catch the metal shavings. Drill a few millimetres at a time, grease the bit, drill, then wipe off the bit and the hole. Repeat this process until you have finished drilling and tapping.
• Use a slow drill speed: This will help prevent the creation of metal shavings and give you more control over the process.
• Use a shortened drill bit: If space is limited, consider using a shortened drill bit that can more easily access the drilling area.
• Vacuum or air pressure: Use a vacuum to suck out metal shavings as you drill, or apply air pressure through the dipstick tube to blow shavings out of the oil pan.
• Overfill the engine with oil: Adding extra oil will help carry metal shavings out of the engine and into your oil bucket when you punch through the oil pan. Block the hole with a rag or paper towel while cleaning your drill bit.
• Change the oil multiple times: After drilling and tapping, change the oil a few times to ensure any remaining metal shavings are removed from the engine.

Please note that these instructions are provided as general guidance, and you should refer to your car's specific repair manual or seek professional assistance for detailed instructions tailored to your vehicle.

Avoiding metal shavings when drilling

Tapping an oil pan for an oil return while it is still on the car can be done, but it is not recommended. The biggest concern is getting metal shavings into the engine, which can cause significant damage. If you decide to tap the oil pan while it is still on the car, you can take the following precautions to avoid metal shavings:

• Use a drill with a slow speed.
• Use a sharp drill bit.
• Drill a small amount at a time (millimetres at a time).
• Use lots of grease on the drill bit.
• Frequently wipe off the drill bit and the hole to remove any metal shavings.
• After drilling, change the oil a couple of times to remove any remaining metal shavings.

Even with these precautions, there is still a risk of getting metal shavings in the engine, which can be very costly to repair. Therefore, it is recommended to remove the oil pan from the car before drilling and tapping.

Using a vacuum to suck out metal shavings

Metal shavings are a common byproduct of metalworking and can cause damage to machinery and reduce product quality if not removed regularly. Using a vacuum to suck out metal shavings is an effective way to maintain a clean and safe work environment. Here are some detailed instructions on how to use a vacuum for this purpose:

Choose the Right Vacuum:

Select an industrial vacuum cleaner designed specifically for metalworking applications. Look for features such as strong suction power, the ability to handle both liquid and solid waste, and a high-efficiency filter to separate metal shavings from oil and other liquids. Consider the tank capacity, power supply, and required oil filtration when choosing a vacuum.

Prepare the Work Area:

Before turning on the vacuum, ensure that the work area is ready. Place the vacuum in a central location with easy access to the oil pan and any other areas where metal shavings may accumulate. If possible, use a vacuum with a long hose to reach tight spaces.

Start Vacuuming:

Turn on the vacuum and begin sucking out the metal shavings from the oil pan and surrounding areas. Use appropriate nozzles or attachments to reach tight spaces and ensure thorough cleaning. Pay close attention to areas where metal shavings may accumulate, such as crevices, slots, and T-slots.

Separate Metal Shavings and Oil:

If your vacuum has the capability, separate the metal shavings from the oil during the vacuuming process. Many industrial vacuums are designed to simultaneously collect liquid and solid materials, and then separate them. This allows for the recycling and reuse of filtered and purified oils.

Dispose of Metal Shavings:

After vacuuming, properly dispose of the collected metal shavings. Some vacuums may have a dispensing gun or automatic discharge system to make this process easier. Ensure that you follow local regulations and dispose of the metal shavings in an environmentally friendly manner.

Maintain the Vacuum:

To ensure the longevity of your industrial vacuum, perform regular maintenance. Clean or replace filters as recommended by the manufacturer. Check for any damage or wear and tear on hoses, attachments, and other components. Keep the vacuum in good working condition to maximize its effectiveness and longevity.

By following these steps, you can effectively use a vacuum to suck out metal shavings from the oil pan and maintain a clean, safe, and efficient work environment. Remember to choose the right vacuum for your specific needs and always prioritize the health and safety of workers when dealing with metal shavings and industrial waste.

Welding a bung onto the pan and tapping with a punch

Welding a bung onto the oil pan and tapping with a punch is a method that can be used to tap an oil pan for oil return. Here is a step-by-step guide on how to do it:

Step 1: Prepare the Oil Pan

• Drain the oil from the oil pan.
• Clean the surface of the oil pan where you will be welding the bung. Ensure that there is no oil or debris on the surface.

Step 2: Weld the Bung

• Position the bung on the oil pan where you want to create the oil return. Make sure it is above the oil level in the pan.
• Use a TIG welder to weld the bung onto the oil pan. Ensure that you get a good weld at the top of the bung.

Step 3: Punch a Hole

• Using a center punch, pound a hole into the center of the bung. This will create a pilot hole for the tap.
• You can also use a drill to create the pilot hole, but be very careful to go slow and use lots of grease to catch any metal shavings. Drill only a few millimeters at a time, grease the drill bit, drill, wipe off the bit and the hole, and repeat until you have drilled through the bung.

Step 4: Tap the Hole

• Using a tap that matches the size of your bung, slowly turn the tap into the hole you have created. Go slowly and use grease to catch any metal shavings.
• Wipe off the tap and the hole as you go to remove any metal shavings.

Step 5: Finalize

• Once you have finished tapping the hole, apply a sealant such as Loctite or RTV to the threads of the bung to prevent leaks.
• Change your oil a couple of times after tapping to ensure that any metal shavings are removed from the oil pan.

Note: It is important to avoid getting metal shavings into your oil pan when drilling or tapping. Metal shavings can cause damage to your engine if they are not removed. Always use grease when drilling or tapping to catch the shavings, and be sure to wipe off your tools and the hole as you work.

Frequently asked questions