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Old 01-12-2011, 11:39 AM   #1
dcaron999
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Join Date: Jan 2004
Location: Mirabel, Quebec, Canada
Posts: 186
My Ride: 2002 330xi
Differential output seal

My 2002 330xi with 90,000Miles has developped at leak on the rear differential output dustcover, on the passenger side. On a few occasions, Ive cleaned the diff housing with brake cleaner, and inspected soon thereafter, to confirm where the leak was coming from. Today, I opened the fill plug while I was under there, and stuck my finger in the fill hole to determine if there was still enough fluid in there. My finger touched the oil about 1/2" to 3/4" below the fill hole. I took a few pics today before cleaning up. The pics are attached to this post.

Can I avoid dropping the differential to simply replace the seal?

Do I simply need to replace part #12, and should I tackle both sides? The driver side looks challenging due to the exhaust in the way ...

10 dustcover plate, large 33131428097
11 dustcover plate, small 33131214298
12 Shaft seal with lock ring 33107505604
13 Lock Ring 168K/L 188K/L 33131214961

See RealOEM diagram, and my pics below.
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Last edited by dcaron999; 01-12-2011 at 03:13 PM.
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Old 01-12-2011, 12:42 PM   #2
M1992
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Join Date: Nov 2009
Location: In an epic world.
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My Ride: 02' E46 330i
Not sure man, but if you come around to getting that seal. Id get it from Pelicanparts.com, they have a wide range of parts for Bimmers, like that seal, that come at cheaper price than most sites out there. Good luck to ya though!
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Old 01-12-2011, 04:43 PM   #3
hamadyr
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Join Date: Apr 2006
Location: Montreal
Posts: 85
My Ride: '05 330i ZHP
I just replaced my diff two days ago.

All you need is part # 12, the seal.

With the diff in the car, you should have enough room on the passenger side to unbolt the halfshaft from the diff and drop it down far enough to have clearance to "pop out" the output flange (Careful not to damage the cover.) and replace the oil seal.

All in all, with a lift, it would take about an hour and half ...

One hour to get it all out and half an hour to put it back together.
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Old 01-12-2011, 05:28 PM   #4
dcaron999
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Join Date: Jan 2004
Location: Mirabel, Quebec, Canada
Posts: 186
My Ride: 2002 330xi
Quote:
Originally Posted by hamadyr View Post
I just replaced my diff two days ago.

All you need is part # 12, the seal.

With the diff in the car, you should have enough room on the passenger side to unbolt the halfshaft from the diff and drop it down far enough to have clearance to "pop out" the output flange (Careful not to damage the cover.) and replace the oil seal.

All in all, with a lift, it would take about an hour and half ...

One hour to get it all out and half an hour to put it back together.
Thanks for your tip. Nice to know you are from my area too. By this phrase "with a lift ...", are you implying supporting/lifting the diff or axle, while replacing the seal?

I just ordered a pair of seal + lock rings from Pelican Parts and a LISLE TORX EXTERNAL SOCKET SET 8PC #26750.
Total of $65 for all.

Will I need to drain the oil first to avoid spillage via the output opening, or does the output shaft sit high enough above the bath?


Thanks again.

Last edited by dcaron999; 01-12-2011 at 08:58 PM.
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Old 04-06-2013, 06:23 AM   #5
nateo
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Join Date: Apr 2013
Location: ohio
Posts: 137
My Ride: 2002 330ci
Quote:
Originally Posted by hamadyr View Post
I just replaced my diff two days ago.

All you need is part # 12, the seal.

With the diff in the car, you should have enough room on the passenger side to unbolt the halfshaft from the diff and drop it down far enough to have clearance to "pop out" the output flange (Careful not to damage the cover.) and replace the oil seal.

All in all, with a lift, it would take about an hour and half ...

One hour to get it all out and half an hour to put it back together.
How do you get the output flange out of there without removing the diff? Doesn't seem to be enough room for a slide hammer.
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