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Discussion Starter #1

Trying to figure out if it is tensioner/chain issue, P/S pump issue, or valVe issue. Only on the drivers side. TIA for any help you can provide!
 

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Premium Member 2005 SLK55 AMG; 2005 SLK350
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How many miles on the engine? I've never had one of these engines so I can only speculate.
 

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Discussion Starter #5
How many miles on the engine? I've never had one of these engines so I can only speculate.
120K. I think I've isolated it to the belt tensioner, actually (big sigh of relief!) When i detached the belt to run the engine without it to see if it was the P/S pump, the sound went away, but I noticed with the belt on, the tensioner vibrated in sycn with the sound. The belt and tensioner were replaced at around 75K but FCPEuro does lifetime replacement.
 
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