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300e 4Matic
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Discussion Starter #1
ok on my engine when your lookign at it formt he from on the right side infront of the air filter housing theres a little bar look slike a stabalizer bar kinda anyoen knwo what that is? because mine is vibrating at idle, it almost sounds like a knock (but my baby ain;t knocking)
 

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W124 Moderator
86 190E 2.3L 16V, 2 95 320TE's, 02 S500
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12,686 Posts
Here is your part:

Accessory Belt Tensioner Shock . About $30 to replace and about 2 hrs of time to remove all the parts to get to it. If you are real happy around tool boxes, it is a no big deal DIY. If not..... then off the the mech.
 

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300e 4Matic
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286 Posts
Discussion Starter #3
my belt is dry rotted and very very loose when i put the new belt on coudl that make it stop rattling?
 

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Its possible that the belt tensioner has failed or loosened due to the worn belt. There is a specific procedure to loosen the tensioner and remove the belt. There is also a specific way to put the belt back on. If you don't follow the procedure you could end up damaging the tensioner and thats a pain in the butt to replace. Do a search for tensioner I'm sure someone has explained it here before.
 

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I JUST REPLACED THAT... not a do it yourself project... you have to remove pulleys and stuff... and i also had that vibration... do not use crow bars to loosen up the pulleys because now my fan belt pully is F"""D i cant tell if the vibration is gone because now theres another noise... UGHHH
 

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94 S500, 99 G320, 99 C280 Sport
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1,128 Posts
The bushing fell out of one of the eyes. I have the same rattle happening in my car.
 

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'84 300D/ dakota benz trk. Sold... miss it. "88 260E '91 190E 2.6 '89 Volvo 240DL "85 300D
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been there done that several times... make SURE and loosen the tensioner bolt BEFORE you try loosening the adjusting bolt. this shock is not a big deal to replace, it does take some knowledge of what tools to use, but within DIY range. one of my eyelets came out causing this same knocking noise and i repaired it using some fuel line. no biggie.
 
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