Clunk and dif bolt coming loose

Discussion in 'E46 M3 (2001-2006)' started by Ef52, Jun 23, 2018.

  1. 23 Jun 2018 at 9:04 AM #1
    Ef52

    Ef52 Wearing official underwear

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    I recently noticed a clunk from the back of the car which was noticeably getting worse. On inspection, a bolt on the drivers side which inserts width ways across the car had come loose on the dif.

    Once tightened, all was good and no clunking. It now sounds like it has backed itself out again after a few days and less than 100 miles. Are these bolts prone to stretching or other issues or should I just get some locktite this time?

    Interested if anyone else has had this issue
     
  2. 23 Jun 2018 at 9:38 AM #2
    simplicity

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    I believe the bolt is a stretch bolt so replacing it would be a good idea. Maybe a little threadlick when you do to help
     
  3. 23 Jun 2018 at 10:35 AM #3
    TimCSL

    TimCSL A mere Chipper

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    As above. This bolt is normally torqued unbelievably tight and has likely stretched. Get a new one from the dealers and replace the two rear bolts with the revised BMW version if not already done. Part no. 23001222891
     
  4. 23 Jun 2018 at 10:57 AM #4
    Ef52

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    Thanks a lot for the replies. Very helpful!
     
  5. 23 Jun 2018 at 1:15 PM #5
    HeroHonda

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    If it keeps getting loose, a spring washer might be wirth trying as well.
     
  6. 23 Jun 2018 at 1:43 PM #6
    HARBER07

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    No it wouldn't
     
  7. 23 Jun 2018 at 5:29 PM #7
    crockett

    crockett On the path

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    Single use and 200 Nm should sort it.
    I can not remember what I paid for that bolt but it was not cheap.
     
  8. 23 Jun 2018 at 5:59 PM #8
    m3rosco

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    As above, fit a new bolt and torque it up to 200 Nm. Use a bit of threadlocker too. Think the bolt is about £15 from the dealers.
     
  9. 24 Jun 2018 at 12:03 AM #9
    HeroHonda

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    Extremely helpful sir :clap clap:
     
  10. 24 Jun 2018 at 12:32 AM #10
    Graham

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    200nm. If you don't do it to that it will eventually come loose. Personally I would just do it up to 200nm first and see how it goes. I've reused the diff bolts plenty of times.
     
  11. 24 Jun 2018 at 2:54 AM #11
    HeroHonda

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    Sound advice^^
     

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