E-Class (W211) 2003-2009

Grinding noise coming from engine

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Old May 20, 2024 | 08:14 PM
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liljojogotit's Avatar
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E350
Grinding noise coming from engine

08 E350 70k miles making horrible grinding noise in the engine Bay Area. It sounds like it was coming from the front so I thought it would be the idle pulleys. I replaced both and the belt and still have this noise.

it happens both at idle and when driving. What should my next move be? Could it be a rod?

see video below:


Last edited by liljojogotit; May 20, 2024 at 08:15 PM.
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Old May 21, 2024 | 04:42 AM
  #2  
VivaJ73's Avatar
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S211 E320 4-matic
Water pump?
Perhaps use a stethoscope to check the source?
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Old May 21, 2024 | 09:07 AM
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Take the belt off and start it to determine if it is indeed pulley driven noise (water pump, a/c compressor, alternator).
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Old May 21, 2024 | 10:34 AM
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E350
Originally Posted by E500 AMG Sport
Take the belt off and start it to determine if it is indeed pulley driven noise (water pump, a/c compressor, alternator).
thank you. I took it off and the noise was gone. I left the belt off and used a sethoscope to pinpoint the noise. Seems like it’s coming from the alternator and the power steering pump.

For the power steering pump do I just change the pulley or the entire pump?
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Old May 21, 2024 | 01:09 PM
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You stated you changed the 2 idler pulleys, what about the tensioner pulley?

https://www.fcpeuro.com/products/mer...ner-2722000270



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Old May 21, 2024 | 09:22 PM
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E500 Wagon, SL63 IWC, E450 Wagon
With a vehicle that age, i would change the ps reservoir for sure. It has a filter built inside of the housing that will most likely be clogged up at this point. at least that is the case with the M113/W211 Es. Not sure if it pertains to the W212. If your PS fluid is still a nice green color, then you may be ok.
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