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Vibration.

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by DougMb, Aug 5, 2020.

  1. DougMb

    DougMb Active Senior Members

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    Your Mercedes:
    Cls 320 diesel 2006
    I have a Cls 320 diesel 2006 with around a 101 thousand on the clock.
    When I start up there is a strong cabin vibration gets stronger when I put it in reverse, less so when in neutral and then no vibration in drive. I took it to a mechanic this morning and he didn't notice any great movement in the engine and reckoned that it was strange that it was happening in drive.
    Told him that I have been googling the fault and he agreed with me that it was possibly engine mounts and the transmission mount.
    Even if just changing the transmission mount cured it would it be worthwhile to change the engine mounts as well and would it make much difference to the ride
     
  2. grahamcol

    grahamcol Senior Member

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    2001 SLK230, 2007 CLK220 CDI
    I think you’ve answered your own question.
     
  3. OP
    DougMb

    DougMb Active Senior Members

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    In what way
     
  4. M80

    M80 Senior Member

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    Your Mercedes:
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    There are a good few reports that changing mounts transorms the ride.
    Be sure to get quality, Febi Bilstein or Lemfoder.
     
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  5. OP
    DougMb

    DougMb Active Senior Members

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    Yea I'm gonna get Lemfoder
    Just hope it cures the problem
     
  6. malcolm210

    malcolm210 Senior Member

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    I would think the transmission mount is as flat as a pancake shouldn’t be too difficult to change
     
  7. OP
    DougMb

    DougMb Active Senior Members

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    No they are a lot cheaper to buy and have fitted. But I was thinking that if that doesn't cure the problem then I would have to take the car back and get engine mounts as well well. That's the reason I asked if it was worth having the engine mounts done at the same time
     
  8. malcolm210

    malcolm210 Senior Member

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    Vibration in reverse is a sure sign the rear transmission mount is the problem

    The OM642 is much lighter than its predecessors so very few engine mount problems reported on here
     
    Last edited: Aug 5, 2020
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  9. OP
    DougMb

    DougMb Active Senior Members

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    I also have vibration in park and neutral but not as bad as in reverse
     
  10. grahamcol

    grahamcol Senior Member

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    Sorry. I misread your post. Others have replied and they seem very knowledgeable about this.
     
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  11. OP
    DougMb

    DougMb Active Senior Members

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  12. star

    star Forum Supporter Authorised Forum Supporter

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    Trans mounts normally show when hitting bump and the gearbox bounces, engine mount will normally alter the vibration from drive to reverse because of the torque loading on the engine. I would say you have an engine mount problem. Some are a pain to fit due to size and possible removal of part of exhaust.
     
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  13. LostKiwi

    LostKiwi Senior Member

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    ^^^^this^^^^
    Sounds to me as though the torque loading in reverse is allowing the engine to move.
    Try this:
    With the bonnet open put the car in R and whilst holding the car on the foot brake with the left foot apply power. Look for movement.
    Then repeat in D. Only apply a fairly small amount of power unless you intend to do a burnout!!!
    If the engine lifts by more than 1" the mounts are shot.
     
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  14. matthew k

    matthew k Senior Member

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    I had exactly the same symptoms, it was the engine mounts. I did try the gearbox mount first with no luck. Avoid Corteco, absolute rubbish, I'm going to have to change them again.
     
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  15. OP
    DougMb

    DougMb Active Senior Members

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    I've ordered Lemforder, both the engine mounts and the transmission mount.
    Some posters are saying engine mounts and others say transmission mounts so it seems the best bet is to change all three.
     
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  16. matthew k

    matthew k Senior Member

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    Your Mercedes:
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    Yeah, there was a very small tear in my GB mount, given how cheap and easily changed they are you might as well.

    TBH, LF should be fine, but given the amount of labour needed to change them if I could go back I might even have bought genuine from Mercedes.
     
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