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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Wed, Aug-09-2017, 08:21:30 PM   #1
NolliM3
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Default Differential leak

The other day I was backing out of my parking spot and noticed that there was a slight thump on the passenger side as the wheel makes the revolution as if a bearing tooth were missing...so I investigated yesterday. I discovered I had a leak by the output seal on the passenger side so, I searched the forum then, jack up the car and turn the wheel while I placed the uncomfortable mechanic stethoscope to listen...couldn't hear anything. Then, I wondered whether it's uneven surface of the apartment parking lot.

Now, my research revealed some refill the differential with 75w90 and add the Corvette limited slip additive; however, when I check Pelican to source parts, all they had were the 75w140...is that the new acceptable fluid?

Also, I wanted to replace the seal without dropping the differential; however, this diagram suggests that there's a lock ring at the end...research results wasn't clear on whether I can pull out the drive flange after disconnection to change the seal. This will be my first time working on any differential...so any tips are welcome.



Differential from the passenger side



the underside of differential



The drip overnight

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Old Thu, Aug-10-2017, 08:47:01 PM   #2
englishtom1596q
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Default Re: Differential leak

No problem doing it with the diff in. Undo the axle and move to one side. The flange pops out with a pry bar and looks just like the end of a regular CV joint. You can then pop the seal out and drive the new one in. Obviously you have to drain the fluid first or you'll have some spillage
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Old Fri, Aug-11-2017, 07:20:26 PM   #3
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Default Re: Differential leak

Quote:
Originally Posted by englishtom1596q View Post
No problem doing it with the diff in. Undo the axle and move to one side. The flange pops out with a pry bar and looks just like the end of a regular CV joint. You can then pop the seal out and drive the new one in. Obviously you have to drain the fluid first or you'll have some spillage
Thank you Tom for responding...I had also found this thread where you and Nick shared cool insights: http://www.m3forum.net/m3forum/showt...ferential+leak

Also, I found this YouTube video so I share here for others:

I am surely glad that it's the passenger side; however, I shall do the drive side as well as change the input seal next month when I do the transmission overhaul. I must say I really appreciate BMW's clever design when I see how it all works.
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Discussing Differential leak in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)