W124 vibration noise - advice please

Discussion in 'General Discussion' started by The Boss, Jun 8, 2011.

  1. The Boss

    The Boss Hardcore MB Enthusiast

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    Hi guys.

    on my 124 cabrio, i took it out of the garage today and was confronted by a vibration noise.

    here are the symptoms, and if anyone can advise it would be appreciated.

    1. on start, and in park, there is no vibration noise.
    2. in neutral, there is also no noise.
    3. when in reverse or d, there is a vibration noise, sounds like a screw in a can shaking.
    4. as you drive, the noise continues..

    this noise appears to be coming around or beneath the drivers side footwell.

    5. when accelerating and driving, the car develops what can only be described as a gurgling sound, that to me is coming from the front drivers side, around the top corner of the dashboard, but it could be engine bay.

    any help or advice appreciated
     
  2. Sp!ke

    Sp!ke Administrator Staff Member

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    It sounds like this might be two separate noises/symptoms.

    The gurgling (from your brief description) could be coolant slooshing round your heater matrix like there is air in the system. Have you checked your coolent levels recently?

    The second noise I'm slightly less sure of without a better description of the noise but the screw in a can reference reminded me of a noise that I had which turned out to be an engine mount that was shot.

    These are fluid filled and have a small bearing inside that can rattle in a really irritating way when worn. I bought a mechanics stethoscope and pinpointed mine in a matter of minutes. For a £5 investment, its a nifty tool to have in your toolbox.
     
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  3. grober

    grober MB Club Veteran

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    The tin can noise could easily be exhaust body heat shields or -more likely- the down pipe external heat shields- they are crimped on to the main pipes and eventually they corrode allowing them to rattle at certain resonant frequencies. Can be cured in the short term with the judicious use of jubilee clips. The gurgling as SPIKE said is associated with your heater water circulation. Possibly air in the coolant or the small circulation pump may have failed
     
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  4. Sp!ke

    Sp!ke Administrator Staff Member

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    Small circulation pump - thats a new one on me.

    Where might that be on a W124?
     
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  5. Dee-124CAB

    Dee-124CAB Hardcore MB Enthusiast

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    Tin noise defo sounds like exhaust down pipe heat shields....
     
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  6. grober

    grober MB Club Veteran

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    Its item 140 on this diagram [hidden by the airfilter box/washer bottle] but sometimes its integral [vertically positioned] with the duo valve assembly nearer the bulkhead. pic inc
     

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  7. Ade B

    Ade B Hardcore MB Enthusiast

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    Engine/gearbox mounts shot meaning when under load the drive train is twisting and causing something to touch the exhaust heat shields perhaps. Had a similar issue with mine although less rattly - Mr Froome reckoned it was the above.


    Ade
     
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  8. carat 3.6

    carat 3.6 Hardcore MB Enthusiast

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    Exhaust heat sheilds or perhaps a rattling catalic convertor?
     
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  9. A210AMG

    A210AMG MB Club Veteran

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    You need to use it more :)

    Cars don't like being stood.
     
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  10. Sp!ke

    Sp!ke Administrator Staff Member

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    n
    interesting....so the purpose of this pump is just to ensure circulation to the heater matrix then?

    (wondering if this could be linked to my somewhat intermittent heating on my w201)
     
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  11. grober

    grober MB Club Veteran

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    Don't think the 190s had this pump afaik - different control system too-- vacuum operated heater valve for example
     
  12. OP
    OP
    The Boss

    The Boss Hardcore MB Enthusiast

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    my mechanic down the road put it on the ramp and suggested two things..

    he could not hear the rattle outside easily, but could hear it inside..

    he suggested it could be engine mount or the torque converter in the gearbox.

    Any thoughts on this?
     
  13. dinoy

    dinoy Hardcore MB Enthusiast

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    what about the drive shift gaters connecting gearbox to the driveshaft do not exact name, in my w124 estate it vibrate on sudden quick kickdown from idle!!
     
  14. grober

    grober MB Club Veteran

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    Expensive thoughts? What did the exhaust downpipe heatshields look like especially at the end crimps where they wear/rust away?
     
  15. grober

    grober MB Club Veteran

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    duplicate post sorry
     
  16. Sp!ke

    Sp!ke Administrator Staff Member

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    Doesnt sound like he has the right tools to find the source of the noise.

    I can recommend someone reasonably local to you (Brentford) that does if you want.

    Mind you, you could start with the engine mounts anyway I guess, as if they've never been done they probably need changing anyway. Likelihood is they are the source of the noise too imho.
     
    Last edited: Jun 9, 2011
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  17. OP
    OP
    The Boss

    The Boss Hardcore MB Enthusiast

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    Id appreciate that :) - PM me please
     
  18. neilz

    neilz Hardcore MB Enthusiast

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    Sorry to bump this but if you haven't had this resolved I have the same tin-rattly sound and the heat shields on my downpipe are completely corroded, in a terrible state, and I am pretty sure that could be the cause of your rattling.

    If you have had this resolved, was it that?
     
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  19. Mr Nicey

    Mr Nicey Hardcore MB Enthusiast

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    :DIts the sound of depreciation.. Dont fret you have along way to go yet ;-)
     
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  20. OP
    OP
    The Boss

    The Boss Hardcore MB Enthusiast

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    havent noticed it, as havent actually used her since i started the thread till i took her out of the garage..

    i presume it is still there, but will have to check when i take her for a drive..

    do u happen to live near London? or do you have a video that could be taken of the sound to see if it is the same sound?
     

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