Applying Rtv To Oil Pan: A Step-By-Step Guide

Applying RTV to an oil pan is a delicate process that requires careful preparation and attention to detail. The first step is to ensure that the oil pan and engine block are clean and dry, removing any old gasket material or RTV residue without damaging the surface. The next step is to apply a small amount of RTV to the corners of the gasket and/or stepped casting areas with gaps. Some people also apply a thin coat of RTV to both sides of the gasket to ensure a strong seal. After applying the RTV, it's important to follow the manufacturer's instructions for curing and drying times before installing the oil pan. Once the RTV is cured, the oil pan can be installed, and the bolts should be tightened in a specific pattern to ensure even pressure.

Clean surfaces and ensure the oil pan is dry

To apply RTV to an oil pan, it is important to ensure that the surfaces are clean and dry. This is a crucial step to achieve a good seal and prevent leaks. Here is a detailed guide on cleaning the surfaces and ensuring the oil pan is dry:

First, remove any old RTV, oil, and dirt from both the oil pan and the block. This can be done using a razor, either plastic or metal. When using a metal razor, be careful and hold it perpendicular to the surface to avoid cutting into the metal. An old credit card or a plastic razor blade is a safer option, as it effectively removes the RTV without damaging the surface.

Next, clean the surfaces with a suitable solvent. You can use acetone, isopropyl alcohol, brake cleaner, carb cleaner, or even WD-40. These solvents will ensure that any remaining residue or contaminants are eliminated. It is important to follow this step with a thorough rinse to ensure no solvent residue is left behind, as it may interfere with the new RTV bead.

Additionally, you can use a Scotch-Brite pad to enhance the cleaning process. However, do not use Scotch-Brite pads on aluminum surfaces, as they can cause damage. Instead, opt for a softer alternative, such as a paper towel or a microfiber cloth.

After cleaning, inspect the surfaces for any remaining RTV residue. Look for any “staining” that may be left behind, as this could impact the effectiveness of the new RTV seal. If necessary, use a solvent specifically designed to dissolve RTV, such as Permatex RTV Silicone Dissolver, to remove any stubborn residue.

Finally, ensure that the oil pan is completely dry before applying the new RTV. You can use compressed air or a clean cloth to speed up the drying process. It is crucial to follow the instructions on the RTV tube for the best results, including bead width and setup time.

By following these steps, you will ensure that the surfaces are clean and dry, which is essential for achieving a strong and leak-proof seal when applying RTV to your oil pan.

Apply RTV to the oil pan corners

When applying RTV to the oil pan corners, it is important to follow the correct procedure to ensure a proper seal and avoid leaks. Here is a step-by-step guide:

• Clean the surfaces: Ensure that both the oil pan and the engine block surfaces are clean and dry. Remove any old RTV or gasket material, being careful not to gouge the block's rail surface.
• Apply RTV to the corners: Apply a small amount of RTV to the corners of the oil pan and/or the engine block. Follow the manufacturer's recommendations for the amount and placement of RTV.
• Install the gasket: If using a gasket, place it onto the oil pan, ensuring it is clean and dry. Some people recommend using a thin coat of RTV on both sides of the gasket to improve adhesion.
• Position the oil pan: Place the oil pan over the engine block, lining up the bolt holes. You may need to rock the pan slightly to get the holes lined up correctly.
• Install the bolts: Start by tightening the corner bolts first, then move to the centre bolts. Follow the manufacturer's torque specifications and tightening pattern.
• Let it cure: Once the oil pan is installed and torqued to the recommended specifications, allow the RTV to cure for the recommended time, typically 24 hours.

It is important to note that RTV should not be overused. It is meant to be a supplemental sealer and should only be applied to the corners and/or stepped joints where gaps are present. Always refer to the manufacturer's instructions for proper use and application of RTV.

Let it dry for 20 minutes

Letting the RTV dry for 20 minutes is a crucial step in the process of applying it to an oil pan. During this time, the RTV will begin to cure and harden, forming a strong seal that will prevent oil leaks.

It's important to follow the manufacturer's instructions on how long to let the RTV dry, as this can vary depending on the product. Some products may require less time, while others may need a little longer. However, 20 minutes is a good average drying time to ensure the RTV is ready for the next step in the application process.

While you're waiting for the RTV to dry, it's a good opportunity to prepare the oil pan and gasket. Make sure the surfaces are clean and dry, and free of any old RTV or gasket material. You can use a putty knife or similar tool to remove any stubborn residue, but be careful not to gouge the surface, especially on alloy blocks. Check the bolt holes and gasket surfaces, ensuring they are clean and free of any corrosion or debris.

Additionally, you can use this time to double-check the oil pan clearance. Measure the distance from the engine block to the bottom of the oil pump pickup and ensure it falls within the recommended range of 3/16" to 1/2". This step is crucial to ensure proper oil flow and prevent the pickup from sucking air during acceleration, cornering, or braking.

Once the 20-minute drying time is up, you can proceed to the next step in the RTV application process, which may involve applying the gasket, tightening bolts, or allowing for further curing time, depending on the specific instructions for your product.

Put the oil pan on the car and let it sit for an hour or 24 hours

Once you've applied the RTV to the oil pan, it's important to let it sit and cure for a while before putting the oil pan back on the car. The amount of time this takes can vary depending on the product you're using and the temperature. Some products may suggest different curing times, so it's always good to check the instructions on the package. For example, Permatex often suggests tightening the bolts just snugly, letting the RTV cure for an hour, and then finishing the torque. They also recommend waiting either 12 or 24 hours before adding fluids, though some people skip this step without any issues.

In general, it's a good idea to let the RTV cure for at least an hour before putting the oil pan back on the car. This will help ensure that the RTV has had enough time to set and create a good seal. Some people even let it cure overnight or for 24 hours, especially if they're working on the car at home and have the time to wait. This longer curing time can help ensure that the RTV has fully cured and will provide a better seal, reducing the chances of any leaks.

However, in a shop setting or if you're in a hurry, you may not have the luxury of waiting for a full 24 hours. In these cases, you can use a product like Permatex The Right Stuff, which cures in less than 5 minutes, or Loctite 515, which sets instantly once everything is torqued down. These products can provide a good seal even without the extended curing time of traditional RTVs.

Once the RTV has cured to your satisfaction, you can put the oil pan back on the car and tighten the bolts to the specified torque. It's important to make sure that the oil pan is clean and free of any dirt or oil before installing it, as this can affect the seal. Following these steps should help ensure that your oil pan is properly sealed and reduce the chances of any leaks.

Tighten to specifications

Tightening the bolts to the manufacturer's specifications is a crucial step in ensuring a leak-free oil pan. The torque values specified in the Haynes manual for using a cork gasket or RTV only are 7 ft-lbs for the small bolts and 18 ft-lbs for the larger bolts. However, it's important to note that these values may vary depending on the vehicle's specific make and model. For example, one source recommends 89 inch-pounds (approximately 7 ft-lbs) for all but the last two bolts, and 18 ft-lbs for the rear two bolts, on a particular vehicle.

It's worth noting that some people choose to tighten the bolts by feel rather than using a torque wrench. This method relies on experience and a sense of how tight the bolts should be, without exceeding the gasket's limits.

It is also important to pay attention to the end seals of the oil pan gasket. Silicone or RTV in these areas can cause the seals to slip out of their grooves, so it is recommended to use a product like Edelbrock's "Gaskesinch" or Permatex "Right Stuff" or Ultra Black to help prevent this.

Additionally, it's crucial to tighten the bolts in a criss-cross pattern, ensuring an even distribution of pressure on the gasket. This helps to create a secure seal and prevent leaks.

Before tightening the bolts, it is essential to clean the surfaces of the oil pan and block thoroughly. Any residual oil or dirt can compromise the seal, leading to potential leaks.

In summary, follow the manufacturer's torque specifications for your specific vehicle, pay attention to the type of gasket and any recommendations for RTV or sealant use, and always ensure clean surfaces and proper bolt tightening patterns for a successful oil pan installation.

Frequently asked questions