R-Class (W251) Produced 2006-2013: R320CDI, R350, R420CDI, R500

Knocking Sound under Acceleration R500

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Old 10-27-2016, 03:12 PM
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2006 R500
Knocking Sound under Acceleration R500

For the last few months my R500 has developed a knocking noise under light acceleration. It doesn't occur when starting or just idling. I have preventatively changed my Serp Belt, idler pully, and spark plugs but it is still occuring. It sounds like its coming from the back of the engine. I am currently at 50,000 miles. Any help would be appreciated.
https://youtu.be/KYcKLRVgZzA
Old 10-30-2016, 09:55 AM
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2008 R320 CDI, 1987 560SL
It could be a motor mount.

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