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M3 Frequently Asked Questions First place to check if you've got a question about your BMW M3. UNDER CONSTRUCTION


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Old Wed, Mar-12-2014, 02:09:33 PM   #11
Obioban
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Default Differentials 2

More...

Quote:
Originally Posted by orangehatter View Post
Cracking into the limited slip:










Reassembly and replacing the old clutches (this is where I lol at the people who buy into the Bimmerworld clutches...)































The cover bolts on the limited slip carrier get torqued to 25ft-lbs with Loctite 242.

Also a parts breakdown for the limited slip carrier:



01 33141209653
Differential, LIMITED SLIP DIFFERENTIAL UNIT. 25%

01 33141209652
Differential, LIMITED SLIP DIFFERENTIAL UNIT. 25%

02 33141210615
Differential housing

03 33141210616
Housing cover

04 33147740005
Screw, Fillister-head. M8X16

05 33141201939
Stop disk. 1,80MM

05 33141201938
Stop disk. 1,85MM

05 33141201937
Stop disk. 1,90MM

05 33141201936
Stop disk. 1,95MM

05 33141201935
Stop disk. 2,00MM

05 33141201934
Stop disk. 2,05MM

05 33141201933
Stop disk. 2,10MM

05 33141201932
Stop disk. 2,15MM

05 33141201931
Stop disk. 2,20MM

05 33141203791
Stop disk. 2,25MM

05 33141203792
Stop disk. 2,30MM

06 33141206919
Stop disk

07 33141204367
DIAPHRAGM SPRING

08 33141203795
OUTER DISC. 1,90MM

08 33141203796
OUTER DISC. 2,00MM

08 33141203797
OUTER DISC. 2,10MM

09 33141210626
INNER DISC

10 33141206909
COMPRESSION RING

11 33141210623
SIDE GEAR

12 33141210624
BEVEL GEAR

13 33141203801
BEVEL MATE SHAFT

.....
Also for those of you that have purchased Bimmerworld "Motorsport" limited slip clutches...



And...



There you have it. The clutch discs that Bimmerworld sells are nothing more than the same OEM discs that you can find through Tischer, Germain, or The BMW Part Store for half the price.

The BMW part number is 33141210626. I got them for $37.56 each through The BMW Part Store (Mike Kent @ The BMW Store in Cincinnati)
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Old Wed, Mar-12-2014, 02:13:31 PM   #12
Obioban
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Default Differentials 3

and finally

Quote:
Originally Posted by orangehatter View Post
My solution to adapt the 14mm ring gear bolt holes down to 12mm for the holes on my 3.46 ring gear:





Custom machined by Blue Chip Tool in Blue Ash, OH from 4140 preheat treated steel. Cost me $110 + tax.

I torqued my ring gear bolts to 110ft-lbs with Loctite 271.
Quote:
Originally Posted by orangehatter View Post
Got this from RockAuto:



Then these:





Which resulted in this:








Races driven in.
Quote:
Originally Posted by orangehatter View Post
Then I got these puppies from Sam at Kelly BMW:



My solution for pinion shims:



The shims are from a Mercury boat, but the choice of thickness is awesome enough to make some fine adjustments. Also the OD is 3" just like the BMW shim, ID is 2.5" which is slightly more than the BMW shim..

Now that I had the shims and my ring gear bolted to the carrier, it was time to check my carrier preload:



Came in at 22in-lbs

Temporarily installed the pinion and carrier to check backlash:



Came in at 0.004in

Then my wear pattern came to this with the original pinion shim:





I was happy with that...

So I went for the final install on the pinion. I precrushed the new crush sleeve down close to the old. A few small blips with the impact and I was at 21in-lbs of rolling resistance. I used Loctite 271 on the new pinion nut and installed a new retaining collar:

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