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-   -   Differential leak (http://www.m3forum.net/m3forum/showthread.php?t=590920)

NolliM3 Wed, Aug-09-2017 09:21:30 PM

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.

https://farm5.staticflickr.com/4347/...5c118b69_c.jpg

Differential from the passenger side

https://farm5.staticflickr.com/4419/...959646c4_c.jpg

the underside of differential

https://farm5.staticflickr.com/4344/...885d6664_c.jpg

The drip overnight

https://farm5.staticflickr.com/4442/...78e1cb56_c.jpg

englishtom1596q Thu, Aug-10-2017 09:47:01 PM

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

NolliM3 Fri, Aug-11-2017 08:20:26 PM

Re: Differential leak
 
Quote:

Originally Posted by englishtom1596q (Post 1067704483)
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.

NolliM3 Sun, Aug-20-2017 06:43:06 PM

Re: Differential leak
 
Well, I was fired up to change out the differential seal and had gotten a 14mm socket allen wrench that Bentley recommended...then came the sadness...one cannot use the 14mm socket allen wrench because when one attaches the wrench, one discovers the wheel-well for the spare tire gets in the way. So, my dislike car emotions ran wild complaining that everything needs a special tool.

Then, I found Nick's thread and what he did...http://www.m3forum.net/m3forum/showthread.php?t=304962 I ordered a long regular 14mm allen wrench from Home Depot (their online) to ship to the store. However, what I am not clear about is whether it's the 1inch piece used because that would create the same scenario as the socket Allen wrench...wouldn't it!

pbonsalb Sun, Aug-20-2017 09:28:44 PM

Re: Differential leak
 
Cut a one inch piece off an Allen wrench or socket. Stick it in the drain or fill plug. Use a wrench on that. There are actually low profile Allen sockets made for this kind of work.

JitteryJoe Mon, Aug-21-2017 03:35:54 AM

Re: Differential leak
 
You trying to get the drain & fill plugs out?
There is a tool for this.
http://www.pelicanparts.com/cgi-bin/...%37%20mm%20Box

Jrrrrrrr Mon, Aug-21-2017 02:05:20 PM

Re: Differential leak
 
Another thing to try is to knock the 14mm hexagonal stub out of a cheap socket, then there will be plenty of room to use the stub with a box-end wrench. IIRC, when I ran into the clearance issue between the differential fill plug and the spare tire well, that's what I did. I used a cheap harbor freight allen socket and the stub came out way easier than you might think - so this is one case where poorly-made tools can come in handy.

aeronaut Wed, Aug-23-2017 12:53:32 AM

Re: Differential leak
 
Quote:

Originally Posted by Jrrrrrrr (Post 1067709696)
Another thing to try is to knock the 14mm hexagonal stub out of a cheap socket, then there will be plenty of room to use the stub with a box-end wrench. IIRC, when I ran into the clearance issue between the differential fill plug and the spare tire well, that's what I did. I used a cheap harbor freight allen socket and the stub came out way easier than you might think - so this is one case where poorly-made tools can come in handy.

This.

Double E Wed, Aug-23-2017 08:06:21 PM

Re: Differential leak
 
$62.00 for the special tool ...my ass.
Drilled a hole in the spare tire well to access the fill plug...then foil tape to cover the hole back up
(on the race car).

NolliM3 Thu, Aug-24-2017 10:03:51 PM

Re: Differential leak
 
Quote:

Originally Posted by pbonsalb (Post 1067709433)
Cut a one inch piece off an Allen wrench or socket. Stick it in the drain or fill plug. Use a wrench on that. There are actually low profile Allen sockets made for this kind of work.

Pbonsalb, is this what the low profile looks like? Home Depot won't deliver the regular long 14mm wrench until the end of the month, and here Home depot has what appears to be the low profile model; however, they don't have any measurement for me to compare and it's about $2 more...so I can cancel my previous order and order this one if it's the low profile. It needs a breaker-bar to crack that nut.

https://farm5.staticflickr.com/4413/...cbc3dff4_c.jpg


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