Droverunner
Senior Member
- Joined
- Aug 2, 2017
- Messages
- 1,013
- Reaction score
- 768
- Location
- West Cambridgeshire
- Your Mercedes
- 2007 CLK 220 CDi Sport. 2014 S-Max 2.0TDCi.
The CLK (Sport suspension, AMG wheels, 40 series front tyres) we've owned for almost 2yrs... now on 130k... has always been a bit noisy on the front suspension but only on short sharp low speed bumps... never when at speed on bumpy roads. As I worked through the front suspension where there was play evident I thought all the clonks would go... but not yet.
So over the past year I've.... checked the springs... checked and adjusted wheel bearings... replaced the lower rear arms on the front suspension (the black ones)… replaced track rod ends... checked rack inner track rod joints... replaced anti-roll drop links... replaced anti-roll bar with OE Mercedes (bonded bushes).
Today it passed the MOT with no advisory items and that despite me mentioning the clonks to the tester who didn't find a bit of play. Likewise pre-test yesterday I had it jacked up and not a hint of play even when testing with a 3ft bar and loading the wheels from under with the bar etc.
So far we have lost the clatter of the drop links... the knock caused by the lower rear arms with play at the hub balljoint end... the knock of failed anti-roll bushes... the clang where the bar had shifted sideways and was hitting a lower arm.
Overall it's much better for all the work done but we are just left with this deep clonk on sharp bumps.
As far as I can think left to investigate are the upper frontmost (silver) suspension arms... strut top mounts... the shock absorber struts.
Anyone chased down an annoying noise like this that turned out to be one of the items we've not yet done?
So over the past year I've.... checked the springs... checked and adjusted wheel bearings... replaced the lower rear arms on the front suspension (the black ones)… replaced track rod ends... checked rack inner track rod joints... replaced anti-roll drop links... replaced anti-roll bar with OE Mercedes (bonded bushes).
Today it passed the MOT with no advisory items and that despite me mentioning the clonks to the tester who didn't find a bit of play. Likewise pre-test yesterday I had it jacked up and not a hint of play even when testing with a 3ft bar and loading the wheels from under with the bar etc.
So far we have lost the clatter of the drop links... the knock caused by the lower rear arms with play at the hub balljoint end... the knock of failed anti-roll bushes... the clang where the bar had shifted sideways and was hitting a lower arm.
Overall it's much better for all the work done but we are just left with this deep clonk on sharp bumps.
As far as I can think left to investigate are the upper frontmost (silver) suspension arms... strut top mounts... the shock absorber struts.
Anyone chased down an annoying noise like this that turned out to be one of the items we've not yet done?