How much does it cost to replace a main seal?

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Randomaccess335

Originally Posted by

Quote:

mweisdorfer

Originally Posted by

Quote:

Randomaccess335

Originally Posted by

Thanks for responses I had it inspected due to having it up for sale and the guy said that he could see the oil seeping from the rear main I didn't actually see it with my own eyes but I trust this guy
Thanks

You can always use brake cleaner & wipe up the oil residue in that area & let it run for a bit while on Jack Stands to see where exactly the oil is coming from. There is a circular, black plastic plug that's near where the trans & engine mount, at the bottom of the engine. It's on the transmission side. It might not even be there; if not you can see the flywheel moving when the engine is on. If there's oil in that compartment, it's most likely a RMS leak.

One of the culprits to causing the rear main seal to leak is the vent hose on top of the valve cover near the fire wall has a one way valve. After so many heat cycles, it stops working and creates excess pressure in the system. Also, the PCV valve next to it stops working properly and this too will cause excess pressure in the system. It's best to replace both of them every 50,000 miles proactively. I'd replace the PCV valve with an upgraded version & SS cap. I'd also add a BMS catch can as well.

The rear main seal can be tricky to identify. It can be done as a DIY, if you have the right tools and can lift the car off the ground a good 21-22" or so; I wouldn't try doing this on Jack Stands personally. Otherwise, expect to pay around $1200.00 or so at a place that specializes in European Automotive repair. DO NOT take it to the STEALERSHIP.You can always use brake cleaner & wipe up the oil residue in that area & let it run for a bit while on Jack Stands to see where exactly the oil is coming from. There is a circular, black plastic plug that's near where the trans & engine mount, at the bottom of the engine. It's on the transmission side. It might not even be there; if not you can see the flywheel moving when the engine is on. If there's oil in that compartment, it's most likely a RMS leak.One of the culprits to causing the rear main seal to leak is the vent hose on top of the valve cover near the fire wall has a one way valve. After so many heat cycles, it stops working and creates excess pressure in the system. Also, the PCV valve next to it stops working properly and this too will cause excess pressure in the system. It's best to replace both of them every 50,000 miles proactively. I'd replace the PCV valve with an upgraded version & SS cap. I'd also add a BMS catch can as well.

Thank you for your response my oil catch can was overflowing and was missing two clamps so it was leaking oil all over the place ran down to the bottom of the engine I cleaned and decreased everything cars been on jackstands now for 30 minutes running still no leak I'm glad I asked you guys thank you very much

It might have been that all along. About every 1000 miles, it's a GREAT idea to check the catch can

Introduction

Let’s talk about a little-known, but essential, part of your vehicle – the rear main seal. Not a topic on the top of your conversation list? It could be, especially if it starts causing trouble.

What is a Rear Main Seal?

The rear main seal is a circular seal mounted at the rear of an engine that stops the engine oil from leaking as it goes from the engine block to the oil pan. It’s a critical seal between the engine and transmission, and if it fails, the consequences can be quite messy.

How Much Will it Cost to Replace a Rear Main Seal in Canada?

In Canada, replacing a rear main seal typically costs between $400 and $1200. While the seal itself is relatively inexpensive (usually $30 to $80), the labour is where the cost adds up. The complexity of the repair requires several hours of work, often 4 to 6 hours, due to the need to remove either the engine or transmission to access the seal.

What are the Symptoms of a Faulty Rear Main Seal?

• Oil leaking from the rear of the engine.
• Oil spots on the ground where the vehicle is parked.
• Engine oil level decreases more rapidly than usual.
• Unusual burning smell from oil dripping onto the exhaust.

How Long Does a Rear Main Seal Last?

A well-maintained rear main seal can last upwards of 150,000 kilometers, though this can be significantly less in harsh driving conditions or with irregular maintenance.

How Does a Rear Main Seal Become Defective?

Wear and tear is a primary cause of rear main seal failure. Over time, the seal’s material can become hard and brittle, losing its ability to keep oil inside the engine. Engine overheating, poor quality oil, and debris can also contribute to its degradation.

How Can a Faulty Rear Main Seal Affect Other Systems in the Car?

A leaking rear main seal can cause oil loss, potentially leading to engine damage due to poor lubrication. Moreover, the oil leaking onto other parts, such as the exhaust, could pose a fire risk.

Is it Safe to Drive with a Faulty Rear Main Seal?

While a minor leak may not cause immediate issues, driving with a faulty rear main seal isn’t advised. The risk of engine damage from oil loss and the potential fire hazard from oil leakage make it a repair you shouldn’t postpone.

How Can I Make My Rear Main Seal Last Longer?

• Regularly check and maintain your engine oil level.
• Use high-quality engine oil.
• Follow your vehicle’s recommended maintenance schedule.
• Regularly inspect for leaks.

Conclusion: Rear Main Seal Replacement

Prevention is better than a cure when it comes to the rear main seal. By sticking to regular maintenance and using high-quality oil, you can potentially extend the lifespan of this crucial component. If you suspect a leak, don’t hesitate to consult with a professional mechanic. The price of ignoring this small but mighty seal can be quite costly.