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Thread: Do I need a new flex disc?

  1. #1
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    Do I need a new flex disc?

    Do I need a new Flex Disc? There are numerous cracks on it but not they are not deep. Just wondering if it is normal to have some cracks or should I change it right away. Both sides have cracks but none of them are around the bolt holes.
    I'm trying to track down the clunk noise.

    99 M Coupe
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  2. #2
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    oh yeah, change that puppy

    I think they go from that stage directly to spaghetti!

  3. #3
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    It needs to be changed, though that doesn't look bad enough to cause your clunks.

  4. #4
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    Quote Originally Posted by Randy Forbes View Post
    It needs to be changed, though that doesn't look bad enough to cause your clunks.
    Yeah the U-joint at the diff looks ok, but I have yet to drop the exhaust to check the center joint. If that is good I will keep looking.
    99 M Coupe
    06 Z4M Roadster (1 of 1)
    85 M635CSi (Euro)
    97 M3 Coupe (Track)
    95 M3 Coupe
    91 850i 6MT
    11 E93 M3
    16 X5 35x
    16 Chevy Tahoe 4WD

  5. #5
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    It looks as if your flex disc has been replaced before, but the nuts are still original. If you replace it yourself, be sure to order new nuts, as they are one-time use.

  6. #6
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    Don't forget to preload the center support bearing when reinstalling (4-6mm).

  7. #7
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    Good luck tracking down the 'clonk' noise. Few among the many who have it have ever been successful at finding and/or resolving it. Just to set your mind at ease, the biggest problem with the noise is that it's as annoying as hell.

    Please let us all know what you find.

  8. #8
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    Quote Originally Posted by Adrian G. View Post
    Don't forget to preload the center support bearing when reinstalling (4-6mm).
    That isn't necessary when changing the flex disc. You only need to remove the 6 drive shaft bolts.

  9. #9
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    Where is the best place to buy flex disc? And how much to spend? I see some twice the cost of others.

  10. #10
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    Quote Originally Posted by Vinci View Post
    It looks as if your flex disc has been replaced before, but the nuts are still original. If you replace it yourself, be sure to order new nuts, as they are one-time use.
    I was going to say that judging from the bolt heads.
    The search box is awesome..try it!


  11. #11
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    Quote Originally Posted by deka1951 View Post
    Where is the best place to buy flex disc? And how much to spend? I see some twice the cost of others.
    Should be around $90. cheaper are either non-oem or non-M versions


    I got mine from oembimmerparts.com

  12. #12
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    Thanks

  13. #13
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    FYI - when I changed the clutch on my Coupe, I found that I had to drop the tail of the tranny 2-3" so the center pin on the drive shaft would come free of the tranny. What this really means is that it would be simpler to do the guibo after you drop the center exhaust section and get the car high enough to drop the tranny a bit.

    The other trick is to use the tranny mount ears and support to hold a box wrench for you. I used a bit of wire to hold the box wrench to the tranny mount so I could use two hands on the torque wrench. It's pretty tight in there and dropping the exhaust really makes it soooo much easier.
    - Ian
    2000 M Coupe, stripped and DE prepped

    46mm wheel bearing socket for rent - $30 deposit + $10 fee. PM for details.

  14. #14
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    I have already dropped the exhaust to have a look at the center support (looks ok) so it will stay off for the flex disc install.
    I ordered mine from Bav Auto ($80), and at my request Ken has now added the self locking nuts to the website.
    I have also ordered UUC tranny mounts so they will be changed at the same time.
    99 M Coupe
    06 Z4M Roadster (1 of 1)
    85 M635CSi (Euro)
    97 M3 Coupe (Track)
    95 M3 Coupe
    91 850i 6MT
    11 E93 M3
    16 X5 35x
    16 Chevy Tahoe 4WD

  15. #15
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    I cant find the part number

    EDIT: is this it? 26112226527 (from realoem)
    Last edited by BMWguy007; 08-03-2008 at 04:30 AM. Reason: EDIT: is this it? 26112226527 (from realoem)
    I love my car.

  16. #16
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    how often does the flex disc break?
    or is it just hit or miss?

  17. #17
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    Quote Originally Posted by BMWguy007 View Post
    I cant find the part number

    EDIT: is this it? 26112226527 (from realoem)
    Yes, that is the part number.

    Quote Originally Posted by zhan View Post
    how often does the flex disc break?
    or is it just hit or miss?
    You don't want it to break. If it does, the driveshaft is going to trash itself and everything around it(exhaust, floor, shifter, transmission mounts, etc.). I don't know how common a catastrophic failure happens, but the extra slack/noise in the driveline that a failing guibo causes isn't good either.

  18. #18
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    Quote Originally Posted by Vinci View Post
    Yes, that is the part number.


    You don't want it to break. If it does, the driveshaft is going to trash itself and everything around it(exhaust, floor, shifter, transmission mounts, etc.). I don't know how common a catastrophic failure happens, but the extra slack/noise in the driveline that a failing guibo causes isn't good either.
    sorry i think better question should be... how often does the guibo needs replacement... or does it depend on how hard one drives

  19. #19
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    My car has 102000 and I just changed the disc last week. The old disc looked pretty bad.

  20. #20
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    Quote Originally Posted by zhan View Post
    sorry i think better question should be... how often does the guibo needs replacement... or does it depend on how hard one drives
    I think age is also a factor. I replaced mine around 38k, and it had cracks. The car was almost 9 years old at that point.

  21. #21
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    Quote Originally Posted by Vinci View Post
    I think age is also a factor. I replaced mine around 38k, and it had cracks. The car was almost 9 years old at that point.
    38k in 9 years?

  22. #22
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    It only had 29k when I bought it in December of 2005. I drive it daily, but I still only put about 7000 miles on it per year, including road trips.

    There are a lot of components on these cars (really, all cars) that deteriorate with age just as much as with use.

  23. #23
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    Question

    Quote Originally Posted by Vinci View Post
    It only had 29k when I bought it in December of 2005. I drive it daily, but I still only put about 7000 miles on it per year, including road trips.

    There are a lot of components on these cars (really, all cars) that deteriorate with age just as much as with use.
    any specific examples for our cars?

  24. #24
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  25. #25
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    Quote Originally Posted by Vinci View Post
    Anything rubber, the soft-top, anything the sun touches.
    i just bought the raggtop kit... i read some write ups on it but how does it really work?

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