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Discussion Starter · #1 ·
While replacing a clutch in my 02 M5, I noticed that the seals needed to be replaced in the differential. Draining the fluid and removing the output shafts along with the drive flange output were straight forward.

I was able to find the part number for the shaft seal with lock ring (331075102890), but I can't find the part numbers for the large o-ring on the drive flange output or the aluminimum washers for the hex drain and fill bolts at realoem.com. I would appreciate if someone could provide the following...
- Confirm the part number for the shaft seal with lock ring is correct.
- Part number for o-ring that goes on drive flange.
- Part number for aluminum washers for hex drain and fill bolts.

Thanks,
David
 

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Discussion Starter · #3 ·
This diagram doesn't exactly match the differential in my car. On the drive flange (right most part in part # 15), has an o-ring on it that is about 4 inches in diameter. Also, parts 3, 4, 5, and 6 are located on the side of the differential near the input drive shaft.
 

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This diagram doesn't exactly match the differential in my car. On the drive flange (right most part in part # 15), has an o-ring on it that is about 4 inches in diameter. Also, parts 3, 4, 5, and 6 are located on the side of the differential near the input drive shaft.
Figured it out yet ?

:confused3
 

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Sorry to revive this thread but my mechanic says there is an o-ring that goes in the output flange of the differential. He says the o ring does not appear on the part diagram and is different from the seal (part 18). Does anyone have an idea what this is and what could be used to replace it?

Thanks.
 

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Well, there is the gasket between the driveshaft and the input flange:
RealOEM.com * BMW E39 M5 DRIVE SHAFT-CEN.BEARING-CONST.VEL.JOINT

#17. The diagram doesn't show it in the right location. It seals connection between the driveshaft CV joint and the diff flange to keep the grease in. It's not an o-ring, it's typical gasket material. If he's looking for an o-ring specifically, then this isn't it.
 

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Sorry to revive this thread but my mechanic says there is an o-ring that goes in the output flange of the differential. He says the o ring does not appear on the part diagram and is different from the seal (part 18). Does anyone have an idea what this is and what could be used to replace it?

Thanks.
There is no O-ring that goes on the output flange. The rubber O-ring goes on the outer cover which BMW refers to as the "Transmission Cover".
The groove on the output shaft is for the round metal spring clip that secures it within the differential. The metal spring clip is what appears to be depicted by part 18.
 

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Well, there is the gasket between the driveshaft and the input flange:
RealOEM.com * BMW E39 M5 DRIVE SHAFT-CEN.BEARING-CONST.VEL.JOINT

#17. The diagram doesn't show it in the right location. It seals connection between the driveshaft CV joint and the diff flange to keep the grease in. It's not an o-ring, it's typical gasket material. If he's looking for an o-ring specifically, then this isn't it.
There is no O-ring that goes on the output flange. The rubber O-ring goes on the outer cover which BMW refers to as the "Transmission Cover".
The groove on the output shaft is for the round metal spring clip that secures it within the differential. The metal spring clip is what appears to be depicted by part 18.
^^ what these guys said. Plus the question makes me a little nervous.
 

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Thanks for all the responses. I will show my mechanic and see if it helps him. If not, I will try to get better information on what he is looking for.

I have replacing a bunch of things (i.e., entire suspension, etc.) and will post when complete.
 

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Well, there are indeed o-rings on the output flange of the differential.

Thanks to vantaam5 for starting this thread:

http://www.m5board.com/vbulletin/e39-m5-e52-z8-discussion/161288-differential-rebuild-some-pics.html

And thanks to CSBM5 for turning me on to Dan at diffsonline.

I called Dan and asked him about the o-rings. He said, "You mean the big, rubber o-rings?" I told him yes and that BMW had said I needed to put a whole new differential to get them. He laughed and told me he had them. Two o-rings, $20 shipped, problem solved.
 

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Somwhere along the way BMW stopped acknowledging that differentials had internal parts.
 
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