W204 Clunking/Knocking noise on Suspension

Discussion in 'Engine' started by Damaino, Jun 28, 2017.

  1. Damaino

    Damaino New Member

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    Hey Guys,

    Maybe someone can give some insight on the problem im having.

    Bought a W204 C200 09 plate, car drives beautifully besides a clunking/knocking noise when i go over a speed bump or rough patches of road.

    Had the car at the workshop, checked the suspension and was told theres some play in the Anti Roll bar links, had that replaced and noise still there, then checked again and was told the Lower control arms have slight play as well - changed that too and noise is still there(but slightly less):fail

    Now ive been told its the shcoks as this is a common problem on the W204 models - the shocks tend to "rattle" with age.

    Could the shocks be causing this noise? for me it sounds like the shocks as its coming from both sides, when we press the fenders to apply pressure we cant hear anything.

    Thanks
     
  2. Stardelta

    Stardelta Hardcore MB Enthusiast

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    Could be the drop links on the shock absorbers, easy change, had it on my bmw and it drove me mad
     
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  3. grober

    grober MB Club Veteran

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    Assuming you have had the ARB links and the lower control arms changed at the front Maybe its the torque arms- they are a known weak spot on the w203 and w204
    [​IMG]
    Mercedes-Benz W204 Torque Strut and Bearing Replacement - (2008-2014) C250, C300, C350 | Pelican Parts DIY Maintenance Article
    https://mbworld.org/forums/c-class-w204/303710-torque-arm-bearings-popping-again.html

    If these are the "lowercontrol arms" you referred to already then ignore this suggestion---[terminology can be misleading and I may have misunderstood ]
     
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  4. OP
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    Damaino

    Damaino New Member

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    Thanks Grober, i havent had the torque arms replaced as you mentioned. There doesnt seem to be any play on them compared to the lower control arm. Im not sure if this is the next step as it really sounds as if its coming from the shock mounting area.

    @StarDelta had the drop links replaced that was the first point of call but no luck.
     
  5. grober

    grober MB Club Veteran

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    There are strut mounts or "bearings" as they are sometimes referred to, that mount the top of the strut to the inner wing. They can go bad. Not sure if they can be replaced except by removing the entire strut??
     
  6. OP
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    Damaino

    Damaino New Member

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    The Guy i bought the car from is offering to replace the front shocks, do you think it will be worthwhile to replace these bearings when replacing the shocks?
     
  7. grober

    grober MB Club Veteran

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    The Sachs bearings come in around £35 each. I hesitate to advocate this because so far you have replaced quite a few suspension components without solving your problem. If the struts are to be replaced its certainly an opportunity to replace the strut mounts at the same time.
     
    Last edited: Jun 29, 2017
  8. OP
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    Damaino

    Damaino New Member

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    Thanks grober, Will it be best to replace this section of the mounting?

    [​IMG]

    or the entire mounting?
    [​IMG]

    Cause i can only find the first image mounting on ECP
     
  9. grober

    grober MB Club Veteran

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    Without knowing which part, if any, of that top mount "assembly" is faulty its difficult to say. There's possibly a small bearing in there also and its not always clear from adverts whether this is included in any part. Normal practice would be to remove the strut and examine the top mounting for damage- sorry I can give a more definitive answer.
     
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  10. BlackC55

    BlackC55 Authorised Forum Sponsor Authorised Forum Sponsor

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    Id put money on it being the shock absorbers causing the issue. We do loads of them.
     
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  11. OP
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    Damaino

    Damaino New Member

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    No Probs Grober, appreciate the help you given!
     
  12. OP
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    Damaino

    Damaino New Member

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    Thanks, do you guys sometime replace the strut mounting Bearing as Grober suggested?
     
  13. Yugguy

    Yugguy Hardcore MB Enthusiast

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    Howdo - do you mean the shock absorbers themselves, or just the strut top mount?
     
  14. ampwhu

    ampwhu Active Member

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    had the same problem on mine. change upper and lower suspension arms. problem no longer exists.

    around 1 hour per side. i'm not a mechanic.
     
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  15. 190

    190 Hardcore MB Enthusiast

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    I had a clunk on my 2009 W204 and it was the shock absorber.



    Here's a service bulletin on suspension noise that pointed me in the right direction:


    Front Strut / Shock Tower: By Symptom
    Technical Service Bulletin # LI32-25_P-048381
    Date: 091208
    Suspension - Front Axle Dull Thumping Noise On Bumps
    NOISES FROM VICINITY OF FRONT AXLE ON UNEVEN ROAD SURFACE
    Topic number
    LI32.25-P-048381
    Version
    1
    Design group
    32.25 Shock absorbers/damper struts/spring struts
    Date
    12-08-2009
    Validity
    Model 204 without code 483 (Vehicle dynamics package), without AMG; Model 204.0## #A 185017 up to * 195993 with head bearing
    Reason for change
    Topic extended to FA shock absorber / torsion bar linkage. / Supersedes DTB P-B-32.25/67
    Reason for block
    Complaint:
    Dull thumping noises or metallic rattling from vicinity of front axle on slightly uneven road surface and/or repaired road surface.
    Note:
    Noises occur in lower speed range (20...approx. 70km/h).
    Cause:
    Several causes are possible:
    1. Head bearings on front axle suspension struts are too stiff (Shore hardness).
    Note:
    Noises from the head bearing occur on more uneven surfaces and sound relatively dull.
    This cause affects only a small, limited production batch! Pay attention to the VIN restriction for head bearings (EPC: "Bearing, suspension strut to
    body") in Validity section! On vehicles outside the restriction range, the head bearing is not the cause of the noise and may therefore not be replaced.
    2. Shock absorber
    Note:
    Noises from the shock absorber are audible on slightly uneven surfaces and sound rather more metallic.
    3. Torsion bar linkage
    Note:
    Noises caused by a torsion bar linkage only occur in a very small number of cases on this model series.
     
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  16. OP
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    Damaino

    Damaino New Member

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    Thanks 190, im having the shocks replaced in the next week or 2, ill post the outcome!
     
  17. JimPattison

    JimPattison New Member

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    Watching with interest. My 2009 W204 C250. with 96000 miles does the same. Passed MOT no problem. Very irritating.
     
  18. 190

    190 Hardcore MB Enthusiast

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    Same scenario with me. They could find no play anywhere in the suspension so it would pass an MOT and did. I was trying to get mine fixed under warranty which was hard work when repeated inspections found nothing worn. I only got them to replace the shock by providing the service bulletin. What you need and I could have done with is someone like BlackC55 who knows from experience that the shocks can fail.

    I don't know the reason they fail but they are not simple shocks. There is some internal mechanism that changes the damping rate and may be that causes the problem.
     
    Last edited: Jul 4, 2017
  19. grober

    grober MB Club Veteran

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    1 person likes this.
  20. OP
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    Damaino

    Damaino New Member

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    Did you replace the top mounting bearing as well?
     

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