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Slight knocking Noise

Discussion in 'Suspension, Steering & Brakes' started by Adamki83, Aug 13, 2019.

  1. Adamki83

    Adamki83 Senior Member

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    Your Mercedes:
    Mercedes E-class, 2005, E270CDI (2.7) + 1992 Mercedes 500SL (R129)
    So, typical to the W211 i have another very faing knocking noise coming from the front left wheel.
    The TOP and BOTTOM ball joints have been replaced.
    Ive jacked the car up to rocked the wheel and i have zero play in the 9 and 3 position, but i do have a little bit of play in the 12 and 6 postion (top and bottom).
    Ive ruled out wheel bearing as i would of thought the whole wheel would rock and i havent been getting any humming noises at speed.
    Also the sound only emerges at around 5mph while driving over a rutted car park.
    Like i said top and bottom ball joints have been replaced and are working perfectly.
    Any suggestions on where to look specifically would be great!
     
  2. LostKiwi

    LostKiwi Senior Member

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    Your Mercedes:
    '93 500SL-32, '01 W210 Estate E240, 02 R230 SL500 (Malcolm Spec), 04 Smart Roadster Coupe
    Movement in the 12 - 6 plane can only be balljoints or suspension bushes if there is no movement in the 3 - 9 plane.
     
  3. OP
    Adamki83

    Adamki83 Senior Member

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    Your Mercedes:
    Mercedes E-class, 2005, E270CDI (2.7) + 1992 Mercedes 500SL (R129)
    Could it possibly be the anti roll bar link?
     
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  4. LostKiwi

    LostKiwi Senior Member

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    Yes for the noise, no for the movement.
     
  5. Wighty

    Wighty Senior Member

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    Your Mercedes:
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    How about a broken front Spring ?
     
  6. LostKiwi

    LostKiwi Senior Member

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    Good call.
     
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  7. OP
    Adamki83

    Adamki83 Senior Member

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    Your Mercedes:
    Mercedes E-class, 2005, E270CDI (2.7) + 1992 Mercedes 500SL (R129)
    I checked the coil spring i couldnt see any fractures or breaks anywhere! I thought coil springs made like a twang noise when turning the wheel? Or am i mistaken?
     
  8. Blobcat

    Blobcat Moderator

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    Your Mercedes:
    R171 SLK280 3.0, Land Rover 110 County SW
    It can do and it might not, depends on how much has broken off
     
  9. OP
    Adamki83

    Adamki83 Senior Member

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    Your Mercedes:
    Mercedes E-class, 2005, E270CDI (2.7) + 1992 Mercedes 500SL (R129)
    I'll have another look later on when i get home! If it is the spring it didnt look that hard getting it out? Just need to be dam careful with spring compressors!
     
  10. Wighty

    Wighty Senior Member

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    Your Mercedes:
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    What about the track rod end balljoint ?
     
  11. LostKiwi

    LostKiwi Senior Member

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    Your Mercedes:
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    That gives movement at 3 - 9.
    He has movement at 6 - 12.
     
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  12. OP
    Adamki83

    Adamki83 Senior Member

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    Your Mercedes:
    Mercedes E-class, 2005, E270CDI (2.7) + 1992 Mercedes 500SL (R129)
    Jacked the car up took the wheel off, spring was absolutely fine checked the bottom and top of the spring couldnt see anything.
    No movement at all on the ball joints or shock absorber!
     
  13. umblecumbuz

    umblecumbuz Senior Member

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    Are you certain it's not bearing play?
    This can sometimes be disguised in the 3/9 position if the pads are firm on the disc.
    Long shot, but possible.
     
  14. OP
    Adamki83

    Adamki83 Senior Member

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    Your Mercedes:
    Mercedes E-class, 2005, E270CDI (2.7) + 1992 Mercedes 500SL (R129)
    The only thing i havent done is try to adjust the wheel bearing, its the first thing im gonna do before i do anything.
     
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  15. OP
    Adamki83

    Adamki83 Senior Member

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    Your Mercedes:
    Mercedes E-class, 2005, E270CDI (2.7) + 1992 Mercedes 500SL (R129)
    Right, its really annoying me now, seems to be sharp bumps at about 5mph is when its really noticeable!
    Previously my lower ball joints made a horrible sqeaking noise and they were replaced about 18 months ago or 20ish k miles they surely couldnt of worn out already! And my upper ball joints about 2 years ago and about 33k miles ago, and usually you can see the play in the upper one when the car is jacked up.
    Coil springs are definitely not cracked or broken.
    So here are my conclusions to what it could be:
    Wheel bearing needs adjustment
    Upper strut mount
    Or possibly shock absorber
    Also im thinking wheather the play in the wheel is unrelated because its a very small amount of play!
     
  16. V6Matty

    V6Matty Senior Member

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    Had the same on my 211, ended up being the shock absorber, only way to confirm was to swap it left to right and take it from a drive to see if the noise follows, just to note there was no play in the shock either,
     
  17. OP
    Adamki83

    Adamki83 Senior Member

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    Your Mercedes:
    Mercedes E-class, 2005, E270CDI (2.7) + 1992 Mercedes 500SL (R129)
    Thought it could be! Did you replace them yourself?
     
  18. LostKiwi

    LostKiwi Senior Member

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    Start with the cheapest things first. Remove the droplink one side and see if it still rattles. If not there's your answer. If yes then move to the next thing.
     
  19. umblecumbuz

    umblecumbuz Senior Member

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    Second - possible drop link. Certainly the right kind of noise.
     
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  20. OP
    Adamki83

    Adamki83 Senior Member

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    Your Mercedes:
    Mercedes E-class, 2005, E270CDI (2.7) + 1992 Mercedes 500SL (R129)
    Thanks! I'll give it a go this weekend, everthing seems pretty straightforward to remove on the front
     

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