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Rear top mounts

Discussion in 'Z3 Roadster & Coupé' started by stevie_a, Jan 22, 2012.

  1. stevie_a

    stevie_a Zorg Guru (IV)
    Scottish Zeds

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    I was looking at the post that shantybeater has posted

    when looking at this photo of the rear shocks i noticed the amount of thread showing after the top of the nut

    now i have just done my mounts today and don't have even half that amount showing

    I have clicking noises from the back ( the reason for changing the mounts in the first place )

    i was wondering if this is why i have the clicking noise. How do i know how tight to put them

    i have heard you don't tighten them right up


    ai141.photobucket.com_albums_r65_shantybeater_New_20car_Suspension_20upgrade_Thread5.jpg
     
  2. Aceman

    Aceman Moderator
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    It is a very low torque setting for the top nut otherwise you end up compressing the rubber in the mount. They use a locking nut and the only purpose of the nut is to stop the shock from dropping out of the mount when on full suspension drop. I can't remember having this problem when I did mine a few years back it may just be a difference in shocks compared to yours that Shanty is using. Yours looks fine in the pic although can't see if the lower cupped washer is the correct way up.
     
  3. Frank.A

    Frank.A Zorg Addict

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  4. stevie_a

    stevie_a Zorg Guru (IV)
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    Yes thats right the photo is Shanty's
     
  5. D C

    D C Regular Member

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    I tightened mine up over 18 months back, it cured the clicking and has been OK since.
    I wasn't heavy handed but made sure they were very firmly tightened.
    Dave.
     
  6. stevie_a

    stevie_a Zorg Guru (IV)
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    That is interesting DC

    the car is great but this clicking is getting me down

    I made a short video and sent it to my mate john who is a bmw mechanic to watch

    If you watch this up to about 30 seconds in you can here the clicks

    ai26.photobucket.com_albums_c149_steventr7_Z3_th_9b42ceb3.jpg
     
  7. Ian_C

    Ian_C Formerly Myredzed

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    From the video it sounds like it could be your rear shock mounts. I'd peel back the parcel shelf liner and remove the rubber dust caps from the shock mounts then go for a drive. Get someone to take a look at and/or video the mounts whilst you're driving. It should be much easier to tell if they're the source of the rattle this way. You could also try the silicon lube thing that worked for me with my new shock mounts (details on the link posted by Frank)
     
  8. D C

    D C Regular Member

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    That's a lot louder than mine was, I could only hear it when cruising along, not when setting off, though as mines an auto I don't lose drive between gear changes.
    Might be worth tightening up just to see if there's any difference, if it stops you could always slacken off a bit.
    Good luck with it, these noises can drive you mad!
    Dave.
     
  9. stevie_a

    stevie_a Zorg Guru (IV)
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    I tried to tighten up the bolts tonight but they are as tight as i can get them

    and this is the thread at the top

    ai26.photobucket.com_albums_c149_steventr7_Z3_IMAG1232.jpg

    ai26.photobucket.com_albums_c149_steventr7_Z3_IMAG1234_1.jpg

    what else could that noise be ??
     
  10. Ian_C

    Ian_C Formerly Myredzed

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    Is the noise louder when you've got the dust caps off and parcel shelf peeled back? If so then I'd try lubricating the mount with silicon spray (probably worth a try anyway). If not then you need to get under the car and start looking at things like fuel tank straps, handbrake cable and rear brake anti-rattle springs.

    For reference here's a pic of my rear shock mount install after lube:
    ai130.photobucket.com_albums_p267_myredzed_IMG_7197.jpg
     
  11. stevie_a

    stevie_a Zorg Guru (IV)
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    It's ok i was just resizing the photos.... :ymblushing:
     
  12. stevie_a

    stevie_a Zorg Guru (IV)
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    Is that standard shocks?
     
  13. Ian_C

    Ian_C Formerly Myredzed

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    I wondered where they'd gone!
     
  14. Garythefish

    Garythefish Dedicated Member

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    From the look of this pic your rubber mount has come away from the metal mount, if this is the case, the shock will be rattling around inside the metal mount causing the noise.

    ai26.photobucket.com_albums_c149_steventr7_Z3_IMAG1234_1.jpg

    The rubber has been known to split

    Maybe a better pic is required ?
     
  15. stevie_a

    stevie_a Zorg Guru (IV)
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    the mount is brand new, my thinking is that i will have to take the shock completely off the car to tighten it full up.

    as at the moment i cant tighten it up in situ.
     
  16. Garythefish

    Garythefish Dedicated Member

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    Check the mount and assembly onto the shock.

    I have popped new mounts due to incorrect assembly on the shaft.

    You cannot overtighten the nut due to the metal sleeve in the rubber mount.
     
  17. Brian H

    Brian H Zorg Guru (V)
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    Hi Stevie,

    I don't know if this helps but the diagram from the BMW tis site shows the following configuration for the shock mounts: -

    [​IMG]

    The whole page can be found here, Click Me

    HTH
     
  18. DangerousDave

    DangerousDave Dedicated Member

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    Now, this assy would make a rattling noise as nut #1 has not been wound down to the bottom of cup #2 #-o .
     
  19. zedonist

    zedonist Guest

    It looks like to me you have left some bits out, your photo looks different to the red zed which has the zinc and yellow support on top, yours does not and lots more thread showing.
     
  20. stevie_a

    stevie_a Zorg Guru (IV)
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    It never had this part on it.

    On looking on the net this is an after market part, a reinforcement plate
     

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