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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 11-07-2012, 03:17 PM   #1
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Join Date: Oct 2011
Location: Orlando
Posts: 7
My Ride: 2002 M3
Rear Diff Leak from HEll!!!!!

I dropped my rear diff in my 2002 M3 and replaced all the shaft seals. The front driveshaft seal and the right axle shaft seal are bone dry. The left axle shaft seal continues to drip fairly heavily despite replacing it 4 more times. I tried hammering the seal in with bearing install tools, then I tried pressing it in slowly with a shop press and a perfectly sized ring to push on the seal. I lubed the shaft seal and output flange and it continues to leak the same amount regardless of what I do. What the hell is going on? Any ideas? I'm starting to think there's a problem with the output flange, shaft, or diff itself. I attached a pic of the diff output flange....I've been installing this with the breather indent facing up.
Thanks for the help
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Old 11-07-2012, 03:26 PM   #2
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Join Date: Jan 2010
Location: Valparaiso, IN
Posts: 7,756
My Ride: '00 328i
I'm not familiar with the design in the e46 diff but is it possible that there's a scratch or crack in the machined surface that the seal contacts? This could cause an unfixable leak
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Old 11-07-2012, 03:41 PM   #3
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Location: Dallas, TX
Posts: 2,217
My Ride: E30-E46-E90-E90M-F30
is the output shaft seal OEM or aftermarket? I am asking beause OE/OEM has a circular spring around the seal that keeps things tight. sometime the spring falls out during shipment or isn't included in the aftermarket version.
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