amgfreak87

Hey everyone,

Currently fixing up my C55. The vehicle is fully MB serviced and is generally in a good condition.

When I test drove the vehicle, I had no vibrations. Since I bought the vehicle with summer tires, I bought an additional set of AMG 18 Inch. These were used and two rims were bent. I immediately realized I had vibrations so I got the wheel balanced which didn't help. I ended up returning the wheels to the seller and put my summer wheels back on. Unfortunately, slight vibrations remained. In the meanwhile I purchased AMG rims with new tires for the vehicle, but this didn't change anything regarding the vibrations.

The slight vibrations started at 55 mph. They were oscillating/pulsating and also stayed there when I let the vehicle roll.

The wheel drive shafts have no noticeable wear or knock sound when moved up and down.

Any ideas or experience with this issue?

Your help is highly appreciated!

amgfreak87

Bump... Any ideas?

Design4111

If I have to guess, I would probably look at:

• shocks
• lower control arms
• upper control arms
• rear 5 link bushes x2 (dont forget small bushings at the bottom)
• anti roll bar bushes (front and back)

Other items that could be (but unlikely)

• sub-frame bushes
• Diff bushings ( 2 at back 1 in the middle)

However, most Tech only balances a wheel "halfway"
i.e. machine say 30 gram, so they do that.
A well trained Tech will rotate the wheel "heavy side" to the rims "lightest side" so you minimise weights to be added.

Keep us posted what you see and find on your car.

amgfreak87

Thanks!

will re-visit those parts and report.

Spooky55

The fact that it only happens under load makes me think maybe the driveline guibos (flex discs) could be the problem rather than the suspension.

Design4111

Is the car stock i.e. no wheel spacers etc etc?

amgfreak87

Thanks but as stated in the initial post, both guidos and the middle bearing including rubber support are new.

yes, car is 100% stock.

I am under the impression the vibrations are also present when rolling again, but they are stronger under load.

Design4111

This might sound silly, but do you have a go-pro?

If you mount it in such a way that it is looking towards the driveshaft, more specifically the centre bearing (which you already replaced) you can quickly pick up any movement while accelerating.
Similarly, you can also mount it at the front or rear suspension (or wheel movement). Just remember to strap a LED or something for light. That is if it is to dark.

Just an idea to try and isolate the area.

amgfreak87

Thank you, I will try that!

amgfreak87

Issue is solved. It was the new tires that were out of balance again.

Many Thanks