strange scraping sound when corning from rear

[grober]

i'll check the bushes and suspension items tommorow for any obvious wear/breakages

if it does appear to be bushes, do you reckon the car is safe to drive? i suspect the dealer wont have the bushes in stock....

Some come as complete arm plus bush assemblies I think?? The one that goes frequently is the large top link item 59 here. http://www.detali.ru/cat/oem_mb2.as...GM=717.433&CT=F&cat=15U&SID=35&SGR=075&SGN=04
I have a feeling its the one that has the eccentric bush for adjusting the camber.

 

[Dieselman]

I think the wheel bearing is worn and the garage tightened the driveshaft nut, which provided a temporary fix due to clamping it tighter.
It sounds like the drive flange is rubbing when cornering.

 

[grober]

So there you go then. It could be-total so far to choose from

exhaust heat shield loose
rear brake pad anti-rattle clip
warped disc
defective tyre
damaged suspension link bush/es
damaged rear wheel bearing

funnily enough I've probably written them in order of cost of repair.

This post does reveal the difficulty of diagnosing a fault at a distance when folks can't hear or observe what's going on directly. Time for some detailed inspection on the weekend methinks. Any competent local garage should be able to replace your rear wheel bearing or suspension arms -use the proper MB parts of course or Lemforder (OEM quality) from ECP at a push. The only thing you might need to get done by Mercedes is the rear tracking if the geometry is changed .

assuming its one of the faults listed of course!

 

[SilverSaloon]

ok, swapped to spare wheel. same problem so swapped back.

took back to KwikFit. They reckon its the shield behind the wheel rubbing on cornering. He tried to bend it out so the wheel clears it. Could it be the MOT tester damaged it when he tested it last week? its better now but still rubs.

you can see where this has scraped the wheel on the inside of the wheel metal, so it does appear to be this.


question is - is the metal warped or can it be caused by suspension problems.

i guess a new shield is on the cards. if still scrapes then more work needed.... are they simple to fit?

 

[Dieselman]

Do you mean the disk backplate, if so just bend it back out again, it's only a dirt guard.

 

[SilverSaloon]

Do you mean the disk backplate, if so just bend it back out again, it's only a dirt guard.

yes #65 here:

but my problem is i dont know if its been damaged - so it could be something else causing the wheel to move and scrape it? the guy at kwikfit didnt seem very concerned..... he also didnt charge anything. he seemed pretty genuine.

if this disc backplate isnt damaged then the scraping is surly dodgy?

 

[Dieselman]

If the backplate isnt bent the it must be the bearing allowing movement.

 

[grober]

The MOT guy may have bent the rear backplate against the wheel while testing the links with a prybar during his inspection. I have seen guys do this! Just bend it back to make sure it clears the wheel/disc/hub round its entire circumference. Worn suspension bushes would not affect that clearance. The only thing that would--- would be a very worn rear wheel bearing but I would have thought that wear to permit that extent of movement would be pretty obvious on proper inspection.
edit:- sorry dieselman has just said this.

 

[SilverSaloon]

the bearing couldnt of been that bad otherwise the wheel would still have play? (which it doesnt as far as i can tell).

i did see him prodding around with a big metal bar

 

[SilverSaloon]

ok, after a few weeks of putting up with this squeel, i've decided to take another look...

thismorning i removed the wheel and went to the disc sheild with a mallet.

it now definatly clears the wheel - i am however unsure if it clears the disc - i need to check this tonight - just wanted to make it clear the wheel 1st as my inital check/test.

if it still happens then i'm going to take it to a smaller independent garage for inspection.

from my "tests" i've discovered i can make it squeek at will (when approx 10 mph) by using throttle where the rear of the car will go down slightly with the "pull".

i'm thinking maybe suspension...............

BUT if i can ensure that the backplate shield is not touching the wheel and its not touching the disc when the car is jacked up, then can i eliminate the suspension theory? i cant see how the wheel/hub should move independently to this shield with suspension.

there is still no play in the wheel when i move the wheel with my hands.....

 

[bolide]

I had a really obscure noise from the rear of a 320 estate. Not one I'd come across before. Evident only at low speeds

We traced it in the end to the bottom bearing of one of the hubs - the hub / bottom wishbone bearing. I think it was #8 in this diagram

Nick Froome
www.w124.co.uk

 

[SilverSaloon]

its in the garage now.... unfortunatly i think its proving to be difficult to source the problem....

i can see this getting expensive

if a certain fault cannot be found, i will get them to replace the rear bearing that the MOT station "fixed" by tightening as I reckon this was dodgy.

Other than that, i guess if they cannot fix it i'll have to bend over and take it from the $TEALER!

 

[alibally]

If you are going to do the bearing get the brake backplate done as well while the flange is off .

 

[SilverSaloon]

its getting a new hub assembly

 

[SilverSaloon]

Bringing closure to this thread - see here for the fix:

http://www.mbclub.co.uk/forums/showpost.php?p=626257&postcount=15