318ti.org forum

Go Back   318ti.org forum > Technical, Maintenance and Modifications > Differentials

Notices

Differentials Limit Slip, gear ratio discussions.

.
» Recent Threads
1998 slicktop hellrot...
03-14-2021 08:40 AM
Last post by anassa
Yesterday 06:07 AM
5 Replies, 1,675 Views
Differential parts...
12-11-2009 03:53 AM
Last post by mb0686
04-10-2021 09:28 PM
125 Replies, 98,131 Views
Cat got stolen, looking...
04-09-2021 06:27 PM
Last post by Pier
04-09-2021 06:27 PM
0 Replies, 173 Views
Happy Birthday snuggz
04-07-2021 05:00 AM
Last post by 1996 328ti
04-07-2021 05:00 AM
0 Replies, 204 Views
1997 Black 318ti 5spd...
03-28-2021 09:11 PM
Last post by jwm
04-05-2021 11:44 PM
3 Replies, 923 Views
Installing Thule Roof...
02-08-2010 06:06 PM
Last post by canduc
04-05-2021 08:44 PM
10 Replies, 29,853 Views
Fuel pressure/Fuel trims...
04-05-2021 04:13 AM
Last post by ilillund83
04-05-2021 04:13 AM
0 Replies, 352 Views
Happy Birthday M5Yates
04-04-2021 05:00 AM
Last post by 1996 328ti
04-04-2021 05:00 AM
0 Replies, 460 Views
Reply Share/Bookmark
 
Thread Tools Display Modes
Old 08-19-2016, 08:52 PM   #1
paul somlo
Senior Member
 
Join Date: Sep 2006
Location: Greeley CO
Posts: 222
iTrader: (0)
Default Replacing Differential Output Seals

Just completed this job on my '96ti and wanted to pass along some helpful hints.

Seal Depth
When pressing in the new seal, do not seat it all the way against the shoulder, you will likely experience leaks. Note the depth that the original seal is pressed to and reference the pictures below. I chose to remove the seal carrier and work on the bench, but this could be done on the vehicle.

Carrier Orientation
The carrier has a rectangular tab on its perimeter. That tab needs to be oriented upwards, as it corresponds to an oil passage on the interior. There's a also a shim associated with each side of the diff. The shim is responsible for setting the bearing play. Ensure that the left side carrier and shim get reinstalled on the left side, same for the right, do not mix. There's also an oring associated with each carrier. If you remove the carriers to replace the seals, you might think about replacing the orings.

To press the seals in, I bought a 2" ABS pipe coupler from Home Depot for $0.90 and turned the OD of one end down in a lathe to 2.615". I suppose if you're careful, you could tap it in with any number of tools, moving evenly around the perimeter. Removal was done with a small brass rod and a hammer, if on the vehicle, I suppose a hooked seal remover would do it.

To facilitate access, remove the spare tire. If you're only going to raise the rear of the vehicle, drain the diff before you raise it, you'll get more of the old fluid out. To fill, I did not use a transfer pump, I went straight from the bottle. You'll need two quarts of fluid. I was able to empty all but four ounces of the first bottle, then I switched to the second bottle to top it off. Removing the spare makes this possible. Although it would have made for better access on the left side, I did not remove the exhaust or sway bar. Although not necessary, I did use a small impact wrench on the torx fasteners. On the right side, tie the half shaft up out of the way, on the left side, you can let it lay on the exhaust pipe.

Edit: After putting some miles on, I noticed a drip from each side of the differential. Incredibly annoying, given that prior to replacing the two seals, one side had a slight weep, and the other side was dry. When I added the fluid, the rear of the vehicle was raised, so I speculated that I might have overfilled it. With the vehicle on the ground, I put a pan underneath and opened the fill plug. Sure enough, a sizable amount of fluid drained and my leak problem magically went away. Apparently, the lip seals aren't able to deal with the added pressure from overfilling. So, two ways to fill the diff - either lower the vehicle and squeeze under, or fill with the rear end raised, then lower and drain any excess.

Tools/Parts
E12 Torx Socket (six fasteners on the half shaft)
13mm socket (four fasteners on the carrier)
33107505602 Diff Seal (2)
33113604119 Oring (2)
Attached Thumbnails
Click image for larger version Name:	e36 diff cover.JPG Views:	73 Size:	21.8 KB ID:	16441   Click image for larger version Name:	e36 diff seal.JPG Views:	70 Size:	37.8 KB ID:	16442   Click image for larger version Name:	e36 diff seal carrier photo.jpg Views:	75 Size:	83.5 KB ID:	16443  


Last edited by paul somlo; 09-01-2016 at 03:34 AM. Reason: overfill condition
paul somlo is offline   Reply With Quote
Old 02-08-2021, 04:19 AM   #2
fast_frizz
Member
 
Join Date: Aug 2003
Location: Lyons, CO
Posts: 78
iTrader: (0)
Default

i made a tool to put the seal at the same depth as the original ones: https://www.thingiverse.com/thing:4754427
__________________
328xi, 2007
fast_frizz is offline   Reply With Quote
Old 02-08-2021, 05:13 AM   #3
paul somlo
Senior Member
 
Join Date: Sep 2006
Location: Greeley CO
Posts: 222
iTrader: (0)
Default

Quote:
Originally Posted by fast_frizz View Post
i made a tool to put the seal at the same depth as the original ones: https://www.thingiverse.com/thing:4754427
Very good, Fritz - did you 3D print it?

Truthfully, I don't even remember posting this, been a while. Right now, the 'ti is laid up in the garage; I had a crank no start condition, and no pressure at the injector rail. I replaced the fuel pump, regulator, and fuel filter. Plenty of pressure at the rail now, but still no start. Hard to believe two unrelated component failures. Pulled some spark plugs, completely dry - it appears that I've got an electrical problem to chase.
paul somlo is offline   Reply With Quote
Old 02-20-2021, 07:12 PM   #4
fast_frizz
Member
 
Join Date: Aug 2003
Location: Lyons, CO
Posts: 78
iTrader: (0)
Default

Yeah. I printed this on my anycubic mega (very affordable 3d printer that was a great entry level machine a few years ago). Design was done using Onshape. I think I’ll do this for all seals from now on. Super easy and much less worry about “did I mangle the seal when I tapped it in w a 1/4” extension...?”
__________________
328xi, 2007
fast_frizz is offline   Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Output shaft seals: A word of caution Entropyman Differentials 10 02-04-2012 06:11 PM
OH ///MCoupe/Roadster Finned Differential Cover Bluebimma US and North America 5 03-26-2011 05:00 AM
Replacing valve seals, spring compressor mirek Engine 0 12-08-2008 06:21 PM
OH: E28 3.25 Limited-slip Differential Bluebimma US and North America 6 11-13-2008 11:31 PM
Output Differential bearing BeardoMcWeirdo Differentials 0 05-09-2006 09:34 PM


All times are GMT +1. The time now is 02:45 AM.


.
Powered by site supporters
vBulletin Version 3.8.8
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
Copyright ©1999 - 2021, 318ti.org
© vBadvanced CMPS v3.2.2
[page compression: 77.70 k/90.12 k (13.79%)]

318ti.org does not warrant or assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information or products discussed.