Leak around rear main seal

[fast330i]

So here we go again, since I got this car I wasn’t able to drive it a week straight

Where I live not many greats mechanics or shops.

Here was my last post: https://www.bimmerpost.com/forums/sh...php?p=31515164

The service changed yesterday: the rear main seal, torque converter seal and a revision + oil on transmission.

The service was a BMW Authorized service one of the best in the city.

I saw a leak in the morning so I went to my friends shop to see the leak. It’s still leaking around there and I don’t know what’s the cause….

I’ll attach some images below let me know if anyone encountered or had similar issues and what they changed.

I’m lost pretty much not great mechanics around me, every service (5 services) told me it was the rear main seal, but after the change stil leaking.

One option left is to go to BMW itself and have it checked there at least to have input from them. I got the appointment from them for next Friday.

Monday morning I’ll have the appointment where they changed the rear main seal.

[B58 parts]

The seal is very difficult to remove without damaging anything. And difficult to install without damaging the seal. They may not have used the correct tools and ripped the seal. This happened to me, the installation tool was not used and a few days later the bolts there were quite oily. Or they may have damaged the rear cover. Or worst case, as I also later did myself, they may have damaged the crankshaft. Sometimes you learn by destroying. The crank has to be perfectly round and clean or it will rip the seal. It's a really thin lip of PTFE and it has to be perfectly round. It's amazing it actually works and all, 7k RPM a metal snout spinning inside a piece of rubber and oil doesn't get out.

This is one area where you really want to buy the special tools. And for the love of God use the center punch before you start the drill bit. Try to pick it out first.

[fast330i]

Originally Posted by B58 parts

The seal is very difficult to remove without damaging anything. And difficult to install without damaging the seal. They may not have used the correct tools and ripped the seal. This happened to me, the installation tool was not used and a few days later the bolts there were quite oily. Or they may have damaged the rear cover. Or worst case, as I also later did myself, they may have damaged the crankshaft. Sometimes you learn by destroying. The crank has to be perfectly round and clean or it will rip the seal. It's a really thin lip of PTFE and it has to be perfectly round. It's amazing it actually works and all, 7k RPM a metal snout spinning inside a piece of rubber and oil doesn't get out.

This is one area where you really want to buy the special tools. And for the love of God use the center punch before you start the drill bit. Try to pick it out first.

Thank you for the information this is way above my expertise)) I’ll let them know Monday if they’ve done like you’ve suggested. The funny thing they are the best M car mechanics in the city. So my guess is the leak was from somewhere else and not the rear main seal? Any chance it could be other parts? Parts that often fail?