Vibration.

[DougMb]

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

 

[grahamcol]

I think you’ve answered your own question.

 

[DougMb]

I think you’ve answered your own question.

In what way

 

[M80]

There are a good few reports that changing mounts transorms the ride.
Be sure to get quality, Febi Bilstein or Lemfoder.

 

[DougMb]

There are a good few reports that changing mounts transorms the ride.
Be sure to get quality, Febi Bilstein or Lemfoder.

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

 

[malcolm E53 AMG]

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

 

[DougMb]

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

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

 

[malcolm E53 AMG]

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

 

[DougMb]

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

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

 

[grahamcol]

In what way

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

 

[DougMb]

No worries

 

[star]

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.

 

[LostKiwi]

^^^^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.

 

[matthew k]

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.

 

[DougMb]

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.

 

[matthew k]

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.

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.