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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Axle Flange seal Replacement



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      10-06-2015, 11:43 PM   #1
Manberg
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Axle Flange seal Replacement

I've searched and searched and cant seem to come up with a solid DIY for the rear axle flange seal. I'm asking if anyone has experience with these, if you could share your procedure and double check the parts I'll need before I start.

As far as replacement goes, In my search I'm finding you need to:
1) Drop the exhaust
2) Unbolt the axle from the half shaft, move it aside
3) Pop out the half shaft
4) Replace things and stuff
5) Reassemble.

This is for n54, I have an n55, but I'm assuming its the same diff. This is also similar to other common BMW differential set ups it seems.
http://workshop-manuals.com/bmw/3_se..._differential/

Does that sound about right? I need to gauge my shop time as I'm going to be working on a limited time basis in/at my shop on a Saturday(super short/day off). Hoping it wont take more than a couple hours.

And for items I'll need:
1) Gear Oil 75/90
2) Axle Flange seal
3) C Clip for the half shaft (?)
4) Drain/Fill plug washers

Ill have all the normal shop supplies at my disposal as well.

I'll head into the dealer to grab OE stuff. Hopefully they can help as well.

Bonus question: Before I bought the vehicle the dealer good willed this repair and blamed my aftermarket suspension for the leak, but I've never heard of a small drop in ride height causing an axle seal to leak on any vehicle. I was told by the previous owner it was an inch drop, and my car is far from slammed. Although I have not gone out and measured the exact ride height myself, a 1 inch difference is still well within stock wheel/suspension travel and should not put any strain on an axle seal, right? ~ Dealer wanted to revert me back to stock suspension before they would work on it again.

Thanks
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      10-10-2015, 09:17 AM   #2
Efthreeoh
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Bonus question sounds BS. The E90 factory sport suspension drops the ride height by .75 inches over the non-sport suspension and BMW doesn't change axle or diff seal P/Ns. The axle has CV joints, which are specifically designed to allow a large range of axle movement. Dealer is BS'ing you.

It sounds like you'll be working on a lift. Either way the exhaust is heavy and way unbalanced. I have a 325i, the 335i is probably even worse. Be careful with it.
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      10-10-2015, 02:27 PM   #3
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