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-   -   Front Diff seal leak (http://forum.e46fanatics.com/showthread.php?t=956577)

76m2002 11-18-2012 08:48 AM

Front Diff seal leak
I've got a leak coming from the front diff on our 2001 325xiT. It is at the output flange on the passenger side, where the front passenger-side axle plugs in to the flange. It is definitely leaking diff fluid, as Redline 75w90 gear oil smells quite different than engine oil or CV joint grease.

Is there a seal here that I can replace? Like part #7 in the realoem diagram? Anyone done this while the diff is on the car?

325xittt 11-18-2012 09:48 AM

Its not to hard to do. I've replace 4 on the car. No need to remove the diff housing to do this. Find a good DIY on this site for the axle removal. Pop out the seal and replace with a new one. I'd drain the diff fluid and fill with new while you are at it. Also would be a good time to consider replacing CV boots. You will need a new axle end nut at the hub.

djantlive 11-18-2012 11:37 AM

I had a diff leak that was fixed with a spray on rubber sealer from home depot. It was easier than taking the diff apart and worth a try. Just clean the diff real well with brake cleaner so the sealer gets a good surface to bond to. If it doesn't work, you can peel or scrape off the rubber coating easily.

76m2002 11-19-2012 06:30 AM

Thanks for the good news. I've never replaced one of these seals. Is it straightforward? I the seal just a cap that I pry off and hammer in a new one?

325xittt 11-19-2012 06:55 AM

Yes the seal is essentially a cap. Pry/Pull it out, and tap a new one back in.

76m2002 11-19-2012 07:33 AM


Originally Posted by 325xittt (Post 14911466)
Yes the seal is essentially a cap. Pry/Pull it out, and tap a new one back in.


Rickna 11-20-2012 10:46 AM

Make sure that the seal is square to the housing as you are installing it. Use a seal driver or rubber/wooden mallet.

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