Ella Walter
The GM LS engine uses edge-molded rubber gaskets for the oil pan gasket, timing cover gasket, and rear main bearing seal retainer plate. Over time, the gasket can become compressed and not rebound to its original shape, causing it to leak. To change the gasket, you will need to disconnect the battery, remove the front tires, and jack up the car. You will then need to unbolt the two plastic covers on either side of the oil pan and remove the bolts holding the pan in place. With the oil pan removed, you can then access and replace the gasket.
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What You'll Learn
- Prepare parts and tools, including a new gasket, oil pan, bolts, and RTV
- Disconnect the battery, remove front tires, and jack up the car
- Remove the oil pan by unbolting plastic covers and detaching rivets
- Access the oil pickup tube and remove the old gasket
- Install the new gasket, ensuring proper alignment and torque specifications
Prepare parts and tools, including a new gasket, oil pan, bolts, and RTV
To prepare for changing a GM LS pan gasket, you will need to gather the necessary parts and tools. This includes a new gasket, oil pan, bolts, and RTV. Here is a detailed list:
New Gasket
The gasket is the critical component that seals the oil pan to the engine block. The GM LS engine uses an edge-molded rubber gasket, and it is recommended to replace it with a new one designed for your vehicle's specific demands, such as the Fel-Pro premium gasket.
Oil Pan
It is recommended to get a new oil pan, specifically the GM part #12558899. This is because the oil pan is an integral structure of the engine block, and a new one ensures proper alignment and support for the transmission.
Bolts
While reusing the original bolts is possible, it is highly recommended to get new oil pan bolts. The old bolts may be brittle due to heat, and new bolts provide peace of mind.
RTV
High-temp RTV (Room Temperature Vulcanizing) is required for the process.
Optional Parts
An engine brace from Harbor Freight (around $70) is optional but recommended. Additionally, if you order a new oil pan, you may need a new oil filter fitting (GM part #12552357) as GM has changed the oil filter fitting to an M20x1.5, requiring a different filter.
Tools
You will need various tools for the job, including a flathead screwdriver, a hammer, and plastic bags to keep your bolts organized and marked.
By gathering these parts and tools, you will be well-prepared to change your GM LS pan gasket. Remember to refer to specific repair guides or seek professional advice for the complete procedure and safety precautions.
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Disconnect the battery, remove front tires, and jack up the car
Before you begin the process of changing your GM LS pan gasket, there are a few preliminary steps you should take to ensure your safety and the stability of your car. Start by disconnecting the battery. This is an important safety precaution as it helps prevent any electrical accidents or short circuits during the repair process.
Next, you'll want to remove the front tires. This step provides easier access to the underside of the car and the oil pan. Removing the front tires also allows you to jack up the car more effectively and securely. Ensure you have a suitable jack and jack stands to lift and support the car. It is imperative to use jack stands to support the vehicle rather than solely relying on a jack, as jacks can fail or lose pressure over time, which can be extremely dangerous.
With the front tires removed, you can now jack up the car. Place the jack in the appropriate lift points, typically along the chassis or reinforced areas of the car's underbody. Lift the car to a height that allows you to comfortably slide the jack stands into place. Once the jack stands are securely positioned, slowly lower the car onto them. Ensure the car is stable and secure before proceeding. It is recommended to shake the vehicle gently to ensure its stability and confirm that it is securely positioned on the jack stands.
At this point, your car should be safely elevated, providing you with the necessary space and access to work on changing the GM LS pan gasket. Remember to work cautiously and methodically, and always refer to a professional mechanic's advice if you are unsure about any steps in the process.
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Remove the oil pan by unbolting plastic covers and detaching rivets
To remove the oil pan, first disconnect the battery and remove the front tires. Jack up the front and back of your car so that it's level. Next, unbolt the two plastic covers on either side of the oil pan. These are held by a single bolt and are referred to by GM as "closeouts". Before you start unbolting the pan, look for two small metal nubs between the bolts. These can be found next to the oil filter location and on the passenger side near the front. These nubs are the bottom parts of the rivets that secure the old gasket to the pan. Using a flathead screwdriver and a hammer, knock the nubs off to free the rivets from the pan. Now, the gasket can be removed later on with a little persuasion.
Unbolt the two large bolts at the bottom of the bell housing that connects to the pan. Then, remove the two skinny 8mm bolts at the rear of the oil pan. After this, start removing all of the 10mm bolts around the pan. The pan should drop several inches, allowing access to the oil pickup tube.
It is recommended that you put bolts in plastic bags and mark where they came from to stay organized. You may also want to consider buying new oil pan bolts, as snapping the two 8mm rear skinny ones can be challenging.
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Access the oil pickup tube and remove the old gasket
To access the oil pickup tube and remove the old gasket, you'll need to first unbolt the two plastic covers on either side of the oil pan. These are referred to as "closeouts" by GM and are held by a single bolt. Before you start unbolting, look for two small metal nubs between the bolts. One will be next to the oil filter, and the other will be on the passenger side near the front. These are the bottom parts of the rivets that secure the old gasket to the pan.
Use a flathead screwdriver and a hammer to knock the nubs off, freeing the rivets from the pan. Now, unbolt the two large bolts at the bottom of the bell housing that connects to the pan. Then, remove the two skinny 8mm bolts at the rear of the oil pan, followed by all the 10mm bolts around the pan. The pan should drop several inches, allowing access to the oil pickup tube.
Once you have access to the oil pickup tube, you can start removing the old gasket. Lower or drop the pickup tube, being careful to remove the O-ring from the tube. Make a note of its location for when you replace it with a new O-ring.
Use a small pry bar or screwdriver to pry up the two rivets and remove them from the pan. Be careful not to drop them into the pan. With the rivets removed, you can now remove the old gasket. It might be helpful to support the pan with a stand to keep it level while you do this, as it tends to tip rearward. Use a razor to scrape the surfaces clean if needed.
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Install the new gasket, ensuring proper alignment and torque specifications
Now that you have removed the old gasket, it's time to install the new one. Ensure that the new gasket is the correct one for your vehicle. The GM LS engine uses edge-molded rubber gaskets for the oil pan gasket.
First, check that the oil pickup tube O-ring is in good condition. If not, replace it with a new one. Now, carefully align the new gasket, making sure it is properly seated and positioned correctly. The oil pan must be properly aligned with the back of the engine block during installation.
Once the gasket is in place, start reinstalling the bolts. Torque the bolts to the manufacturer's specifications, being careful not to over-tighten them. It is recommended to refer to a repair manual or seek advice from a certified technician or mechanic to ensure the correct torque specifications are applied.
After the bolts are tightened, check the gasket for any signs of leakage. If the gasket is leaking, you may need to adjust the torque or seek further advice from a professional.
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