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Faults, Fixes and DIY Please share your experience and knowledge with other members by contributing your own DIY, or by helping another member find the elusive fix!


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Old Tue, Nov-10-2015, 04:32:13 AM   #31
Siackkkk
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Default Re: Rear Differential input seal replacement

Great writeup
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Old Wed, Dec-30-2015, 03:50:14 AM   #32
julio9817
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Default Re: Rear Differential input seal replacement

Just got this done. It's been 2 days so far so good. Good write up. My flange was stuck as shit... I had to use a puller.
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Old Sat, Apr-23-2016, 12:47:51 AM   #33
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Default Re: Rear Differential input seal replacement

hanks for asking! While it took a lot of struggling to figure it out I was able to replace the rear diff cover (with the new bushings) and the passenger side differential output seal with the Diff in the car. Now that I have done this once, the next time will be a piece of cake!!

SEAL REPLACEMENT: I disconnected the sway bar brackets with the bushings, then I only disconnected the sway bar link from the passenger side control arm. I then removed the axle and used a piece of wire to support it so it was out of the way but we didn't stress the joint.

The next step was not obvious to me because of all the gunk build up on the differential flange, but you can unbolt the flange from and remove it from the car. The seal is installed into this flange. Once I had the flange out of the car, it was really easy to tap the seal out of the flange (Note, measure how far into the flange the seal sits to that you place the new one in the same location. To get the new seal into the flange, I placed the old seal on top of the new one, and used the bottom of a wine bottle (it's the right diameter) and gentle tapped until the seal was started. Then it used a wide and flat screw driver and worked my way around the seal gently taping the unit down and in. Make sure you don;t cover the drain hole in the side of the flange!!! I literally reversed the process to install. When you install the flange, make sure you ORIENT THE DRAIN HOLE correctly (Thanks to TRIPEVANS on the M5 Forums for the instructions). Mine was not in the correct position which I suspect is one of the reasons mine leaked.

(http://www.m5board.com/vbulletin/e39...ment-pics.html)

REAR BUSHING REPLACEMENT
This was a little tricky, but definitely doable once you get it down. I placed a jack under the diff, and removed the mounting bolts. The I lower the diff just a bit until I would reach the top two bolts that mount the cover to the back of the diff. With the diff balanced on the jack you can gentle rock the diff side to side to reach the top bolts. I then removed all the bolts and pulled the back off (note, that even though you drained the diff, a little fluid will still leak out, just have some newspaper or a catch can.).

Once the diff cover is off, make sure you scrape and clean the diff to remove all of the residue of the old paper gasket. I then placed the top two bolts into the flange and used them to orient the new gasket while I maneuvered the new cover onto the diff housing. Good Luck!

For those of you who want to upgrade your differential bushings, I am selling my Old Diff cover. You can then order aftermarket bushings and have them pressed into my diff cover so that you have everything ready to go once you get under the car. PM me if you are interested in my cover!

Thanks to all for your support during the project.
Attached Thumbnails
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Attached Images
File Type: jpg Diff wo flange.jpg (285.0 KB, 75 views)
File Type: jpg Diff-Flange 1.jpg (185.3 KB, 72 views)
File Type: jpg Differential1.jpg (214.4 KB, 75 views)
File Type: jpg Bushings.jpg (205.2 KB, 73 views)
File Type: jpg Seals.jpg (203.8 KB, 73 views)
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Old Sat, Jul-16-2016, 03:23:37 PM   #34
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Default Re: Rear Differential input seal replacement

Anyone ever do this with the diff completely out of the car?

Got any advice before I tackle today or tomorrow?

I'm thinking about how to rig something up to keep it from spinning while I loosen with a breaker bar in my driveway. Just the dif, no axles or anything.

Thinking if I could have a buddy hold it down I will use a big ass breaker bar to loosen.

Thoughts?
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Old Sat, Oct-01-2016, 07:58:30 PM   #35
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Default Re: Rear Differential input seal replacement

Bringing this thread back, I just discovered im a victim of a pinion seal leak.

Looking to for seal part #, put im having a hard time getting it and i dont wanna order the wrong thing.
Anyone can post up a link/pic/part number!

Thanks
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Old Mon, Oct-03-2016, 04:19:44 AM   #36
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Default Re: Rear Differential input seal replacement

Google this part number 33121213949
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Old Sun, Mar-19-2017, 05:51:00 PM   #37
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Default Re: Rear Differential input seal replacement

Any issues with doing this with the wheels on the floor?

I have a pit so no need to jack, unless I need to.

TIA.
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Old Sun, Mar-19-2017, 10:36:08 PM   #38
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Default Re: Rear Differential input seal replacement

Quote:
Originally Posted by srhutch View Post
Any issues with doing this with the wheels on the floor?

I have a pit so no need to jack, unless I need to.

TIA.
You'll need to be able to roll the car in order to get to all the flange nuts. Don't forget the papaer gasket otherwise you'll be doing it all again...
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Old Tue, Mar-21-2017, 08:39:48 PM   #39
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Default Re: Rear Differential input seal replacement

http://workshop-manuals.com/bmw/3_se...ial/page_1131/

Seems like BMW thinks you can remove input flange without disassembling diff to add new crush washer.
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Discussing Rear Differential input seal replacement in the Faults, Fixes and DIY Forum - Please share your experience and knowledge with other members by contributing your own DIY, or by helping another member find the elusive fix! at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)