W204 C220 produces a metallic knocking sound.

[Dudeta]

May I request some assistance, please?

2013 W204 C220 CDI.


I am experiencing an undesirable banging sound from the front.
I have reviewed previous postings on this platform, but...

Knock is a metal-to-metal contact.
Originating from the passenger side, to the best of my knowledge, based on the tests we have conducted.

On smooth roads, there is either no sound or perhaps a barely perceptible knock that I can detect, but not the passenger.
Passengers may also hear on other roadways.
It has been occurring for many months, around six months.
Initially experienced occasional little knocks, which then escalated to a constant issue.
Each weekend, I inspected the garage for any banging sounds and ensured safety.
Discovered on both sides that the lower ball joint/arm exhibited some play.
Altered them.
The upper ball joint/arm on the passenger side exhibited play and produced a little knocking sound. Altered that.
The wheel bearing was somewhat loose; it has been tightened.
Subsequently, we discovered that the shock absorber on the passenger side was bottoming out. Replaced both shock absorbers. The springs seem satisfactory.
The knocking persists. As I said, components have been replaced individually almost every weekend, anticipating the elimination of the banging sound.
I fully opened the hood without using jacks, ramps, or lifts, with the vehicle remaining on the ground. I stood on the area where the strut is secured at the top of the engine compartment and bounced the car, resulting in an audible banging sound.
The engine mounting seems to be the issue, since there is considerable engine movement; thus, it was replaced this weekend.
Contemplating that everything is satisfactory.
No. Once again, positioned on the engine bay strut and oscillating the vehicle, hands flailing in all directions...
The sound emanates just from one side when the automobile is stationary and when the driver's side is similarly bounced. While operating the vehicle, the sound seems to emanate mostly from the passenger side, however it is also perceptible at the front by the bumper.
The roll bar linkages to the strut have been replaced. However, not the shrubs. Or the strut bearings.
What assistance can any of you provide?
No steering oscillation. No swaying permitted.

Thank you, team.
Wishing you a pleasant day.

[Ziinsig]

Replace the arb bushes, since they produce significant noise after they have dried and hardened.


Does the banging cease while driving in rainy conditions?

[Dudeta]

Greetings,
Upon reflection, if it have merit...

When I position myself on the engine bay strut bolts and oscillate the vehicle (as it is more manageable for my little arms and facilitates better auditory detection of the banging), I am uncertain if the knocking sound occurs when I depress the car or when I rebound, if you get my meaning. This indicates that there would be a pronounced impact on the suspension when I bounce, or a sound when the weight is removed from the suspension during the bounce.
I have not attempted to ascertain that...if it is of any assistance.

Thank you.

[Dudeta]

Based on my recollection, regardless of weather conditions, mostly rain. Both circumstances are present.

While we were underneath the vehicle on Saturday, I attempted to insert a crowbar into the arb bushes; however, I anticipated some movement but was unable to get a satisfactory leverage.
Are those bushes simple to change?


The installation of the passenger side mounting was rather straightforward, prioritizing safety and resulting in minimal damage. And you may proceed. This is my first experience with engine installation on any vehicle.

Thank you

[Ziinsig]

Elevate the front of the vehicle on both sides and remove the wheels; this will alleviate the stress on the bar.

Detach the clamps and extract the bushes (they are fractured, hence no more action is required regarding the bar).


Install fresh bushes and evaluate the outcome. Best of luck...

[Dudeta]

Indeed, I have seen similar situations with other vehicles; however, I have observed some individuals asserting that the roll bar itself must be replaced rather than only substituting the bushes.
I conveyed it to my father, and he responded negatively.


Do you believe that Strutt Bearing or Strutt Mountain is acceptable? I first believed it was viable and intended to proceed until I conducted the bounce test I mentioned before.

Thank you.

[Dudeta]

I immediately contacted the vehicle store where we get some components, but they informed me that they cannot procure the bushes, since it is a whole assembly.
I researched online a few days before to the engine mount replacement and saw that some individuals were aware of a new ARB. I noted the bushes, which I believe are from the brand Ted; they are composed of substantial rubber. Additionally, I encountered bushes that are designed in two sections.


I cannot recall if it was 7zap or another website that provides a component number corresponding to the chassis number, however this is not always guaranteed. Currently, it merely indicates linkage and the bar, without specifying the bush number.

Is it possible to remove the rubber bushes, install new ones, then reattach them to the vehicle?

Thank you

[SlayNeo]

This seems to be a roll bar link rather than the bushing. The AR bushes on 204 seldom deteriorate. Purchase only authentic items, and they are oriented.

[Dudeta]

Examine the TEDGUM anti-roll bar bush in the AUTODOC application at https://m.auto-doc.ie/tedgum/15556366

One of the objects.
Indicates... W204 C-Class, model years 2007 to 2014.

[Dudeta]

Indeed, there are many brands available on Auto Doc, but I am unable to find the two-piece models I had seen.

Thank you.