DIY Rear Differential Side Axle Seal Replacement with pics - Page 11 - BMW M5 Forum and M6 Forums
E39 M5 and E52 Z8 Discussion 1998-2003 Advertiser's Forum

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post #101 of 108 Old 2nd January 2019, 12:30 AM
dan.trainor
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Originally Posted by GreenM5 View Post
I can confirm that 135 NM is too high torque for the application, I attempted to torque to this value and before reaching it the bolt bracket that sits on the face of the joint that holds two bolts on each has split, cracked and broke. Can these be bought separately?

To attention of anyone doing this job DO NOT USE THE HIGHER TORQUE VALUE OF 135 NM this thread has not been clear enough on this so please do not make the same mistake and use the lower 83 NM.
Can confirm, 83nm is also too much,
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'07 E60 M5
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post #102 of 108 Old 2nd January 2019, 01:53 AM
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Originally Posted by dan.trainor View Post
Can confirm, 83nm is also too much,
Not sure where that bolt came from but that is not an E Torx bolt.
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post #103 of 108 Old 2nd January 2019, 04:41 AM
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Not sure where that bolt came from but that is not an E Torx bolt.
Correct, the bolts that secure the ring that holds the output shaft seals is mounted to the diff housing with these. The output shafts use e-torx.

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post #104 of 108 Old 2nd January 2019, 07:00 AM
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Originally Posted by dan.trainor View Post
Correct, the bolts that secure the ring that holds the output shaft seals is mounted to the diff housing with these. The output shafts use e-torx.
So the sidecover hex bolts. Not shown on Realoem. Can you read the steel grade on any of the heads? Then measure the bolt shaft diameter and length and you can look up the torque spec.
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post #105 of 108 Old 2nd January 2019, 07:29 AM
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Originally Posted by xrviz View Post
So the sidecover hex bolts. Not shown on Realoem. Can you read the steel grade on any of the heads? Then measure the bolt shaft diameter and length and you can look up the torque spec.
Sidecover, got it.

They're 10.9 and I think zinc coated. I matched them to 1.25 using my die kit. I don't know enough about bolts to know I could use some other bolt with the same hardness / coating, pitch, and length as a suitable replacement. I mean everything on this car is specific and expensive, so why not a handful of bolts being the same way, too?

I'll see what Ace has tomorrow. Thanks for your help.

'07 E60 M5
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post #106 of 108 Old 15th January 2019, 02:16 AM
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Just did my Diff side seals, c-clips and O-rings... oh what fun...

Used a micrometer to measure depth of the seal, and make sure its in evenly (square).
Vent holes are set at top, diagonally facing toward rear of car too.
Castrol fluid, and feeling smooth.
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post #107 of 108 Old 15th January 2019, 02:27 AM
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Originally Posted by ObjectEdit View Post
Just did my Diff side seals, c-clips and O-rings... oh what fun...

Used a micrometer to measure depth of the seal, and make sure its in evenly (square).
Vent holes are set at top, diagonally facing toward rear of car too.
Castrol fluid, and feeling smooth.
Heck yea. I'm 'bout to go put mine back together, too. Started the last leg on Friday and discovered that the pinion seal, the real reason I started all this work in the very first place, was out of round. Of all things. My replacement got here today.

Can you describe how you used the micrometer to measure the seal depth? It was my understanding that I should just *seat* it in square and the output shaft should push it to the correct depth as you push it back in to the diff where the circlip locks in to place.

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post #108 of 108 Old 15th January 2019, 02:28 AM
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Quote:
Originally Posted by ObjectEdit View Post
Just did my Diff side seals, c-clips and O-rings... oh what fun...

Used a micrometer to measure depth of the seal, and make sure its in evenly (square).
Vent holes are set at top, diagonally facing toward rear of car too.
Castrol fluid, and feeling smooth.
Have you tested it yet? Output shafts haven't fallen out of the diff have they?

'07 E60 M5
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