Suspension

[craig0311]

Hi folks,

I have replaced the front suspension both sides on my E270 with brand new parts.

2 Control arm, ball joints, upper control arm, anti roll bar connection, tie rod ends.

When I go over uneven road at slow speed have a knocking noise by don’t hear it any other time.

I have stripped everything off again and torqued to correct spec and still have this noise.

Am I missing something obvious that is causing this?


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[Dodipops]

Struts, brake pad rattle or anti roll bar bushes?

 

[craig0311]

Hi struts were also replaced and new discs and pads, the anti roll bar connection pieces were changed too.

Looked at the ARB bushes and look fine???


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[Dodipops]

Assembly of the struts?

Not much left if you’ve done all that.

 

[Nicebutdim]

Top suspension mounts?

 

[grober]

Worn Engine and gearbox mounts?

 

[craig0311]

Would top mounts give a knocking noise, again these looked fine when put new springs on, might bring it off again to make sure.

Thanks for the reply’s


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[OneForTheRoad]

Would top mounts give a knocking noise, again these looked fine when put new springs on, might bring it off again to make sure.

Thanks for the reply’s


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Yes. If it still knocks after that speaking from experience I'd learn to live with it or you'll go insane and spend an awful lot of time and money looking for it.

 

[Marku]

Did have exactly that sort of noise in that situation. Took a lot to diagnose it but it turned out to be the bushes on the anti-roll bar. The were replaced and the noise went.

 

[craig0311]

On the bar itself or round connection pieces?


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[OneForTheRoad]

You cant buy the anti roll bar bushes they are bonded to the bar itself.

 

[Marku]

Well that is what the service manager at the dealer told me after they had done quite a lot of investigation. Even took it out and ran it over a rough surface. It solved it anyway and I wasn't paying for it either.

 

[OneForTheRoad]

Well that is what the service manager at the dealer told me after they had done quite a lot of investigation. Even took it out and ran it over a rough surface. It solved it anyway and I wasn't paying for it either.

More likely to have been the bushes in the links.

 

[BlackC55]

Did you load the suspension before tightening it all up? What make parts did you use?

 

[craig0311]

Hi folks just an update, turned out I hadn’t tightened the nut on top of strut when putting spring back on properly and that is what was causing the knocking , tightened up and all good now!. As for the parts I got them delivered Germany apparently genuine. Thanks again for all your help, great forum this!