Thumping/Knocking Sound - Torsion Bars? NO! - Mercedes-Benz Forum

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Old 02-06-2008, 02:01 AM   #1 (permalink)
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Smile Thumping/Knocking Sound - Torsion Bars? NO!

Hello Everyone,

I wanted to share my experience in relation to the above subject so that others may hopefully benefit from it.

I have been experiencing a thumping/knocking sound on the passenger side front of my ML55 whenever I was on rough roads (which is all the time here in West Africa!) and the vehicle rocked from side to side. From my research on this Forum I thought it may well be my torsion bar bushings or some related part. Some members kindly sent me diagrams of the torsion bar and the bushing/parts required.

Luckily for me (cost wise) I decided to take it to an independent mechanic who had an assistant lie under the truck on the passenger side whilst the vehicle was rocked from side to side and lo and behold, it wasn't my torsion bars or any part of the front suspension at all. It was a piece of plastic insulation which is attached under and near to the passenger side of the vehicle. I don't know quite what that part is or what it is called but it is attached to the near passenger underside of the vehicle by 10 plastic screws and is about 3 feet in length. (Maybe 43sqd and other technically minded MLers will be able to tell us what that part is) This edge of this piece of plastic was rubbing against the chassis as the vehicle rocked from side to side and producing a thumping/knocking sound. It is worth checking that out before proceeding to the dealership who may simply put it down to your torsion bars.

I hope I have relayed and described this properly and that it helps someone save some money like I did someday.

ps. Can someone please tell us all what that part is and it's function?

Last edited by FAR888; 02-06-2008 at 02:05 AM.
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Old 02-06-2008, 08:37 AM   #2 (permalink)
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Hello??? Anyone??

Last edited by FAR888; 02-06-2008 at 08:40 AM.
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Old 02-06-2008, 09:37 AM   #3 (permalink)
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Since this is the age of digital cameras, could you take and post a pic?
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Old 02-06-2008, 01:53 PM   #4 (permalink)
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Good find Far! I too would love a picture if possible.
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Old 02-06-2008, 02:53 PM   #5 (permalink)
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on my drivers side when i go over a hump or bump in the road, i hear this like knocking or not quite thumping noise sound i suppose, but not all the time. you cant feel anything while driving it, but you hear that it is something in the suspension. you think its my torsion bar or the plastic or what? it started around when it started to get cold here and i thought it was something just due to the cold. should i have it checked out? the truck is under warranty.
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Old 02-06-2008, 03:32 PM   #6 (permalink)
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should i have it checked out? the truck is under warranty.
Is this a serious question. Look at the vehicle you drive. GO. You could get all kinds of goodies out of this while they just replace things until they find it.
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Old 02-06-2008, 04:42 PM   #7 (permalink)
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Is this a serious question. Look at the vehicle you drive. GO. You could get all kinds of goodies out of this while they just replace things until they find it.
hahaha no no, what i meant is should i have it checked out RIGHT AWAY, as in is it a serious problem, or could i just wait for something when it really needs to go in. i have the warranty for another 2 years so i have plenty of time
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Old 02-06-2008, 04:52 PM   #8 (permalink)
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Oh, that much is up to you...jack up the front and make sure none of the suspension or anything else you can grab hold of is loose...otherwise its your risk to take
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Old 02-07-2008, 01:06 AM   #9 (permalink)
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Originally Posted by FAR888 View Post
Hello Everyone,

I wanted to share my experience in relation to the above subject so that others may hopefully benefit from it.

I have been experiencing a thumping/knocking sound on the passenger side front of my ML55 whenever I was on rough roads (which is all the time here in West Africa!) and the vehicle rocked from side to side. From my research on this Forum I thought it may well be my torsion bar bushings or some related part. Some members kindly sent me diagrams of the torsion bar and the bushing/parts required.

Luckily for me (cost wise) I decided to take it to an independent mechanic who had an assistant lie under the truck on the passenger side whilst the vehicle was rocked from side to side and lo and behold, it wasn't my torsion bars or any part of the front suspension at all. It was a piece of plastic insulation which is attached under and near to the passenger side of the vehicle. I don't know quite what that part is or what it is called but it is attached to the near passenger underside of the vehicle by 10 plastic screws and is about 3 feet in length. (Maybe 43sqd and other technically minded MLers will be able to tell us what that part is) This edge of this piece of plastic was rubbing against the chassis as the vehicle rocked from side to side and producing a thumping/knocking sound. It is worth checking that out before proceeding to the dealership who may simply put it down to your torsion bars.

I hope I have relayed and described this properly and that it helps someone save some money like I did someday.

ps. Can someone please tell us all what that part is and it's function?
If i am not mistaken far, this is the rock and gravel protective shield on the passenger side. When I installed my side step bars this is what the installation manual called this part. It shields the underside from rocks and other debris.
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Old 02-07-2008, 04:32 AM   #10 (permalink)
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If i am not mistaken far, this is the rock and gravel protective shield on the passenger side. When I installed my side step bars this is what the installation manual called this part. It shields the underside from rocks and other debris.
Eureka!

It looks exactly like what you describe busoptr!

It does appear to be some sort of protective cover/shield and just under the part of the vehicle where side steps would be attached to. That protective shield was rubbing against the chassis and producing a thumping/knocking noise in my case.

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Since this is the age of digital cameras, could you take and post a pic?
Ha ha ha - Touche! I will borrow my sister's digital camera and take pictures by the weekend! - It's just that I hate the things!
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