OM642 ML320 CDI engine noise caused by timing belt tensioner. I fixed this with a U$ 150 tensioner. 30 minute job. 123K miles 2007 model. I realize the original tensioner got stuck in the same position - oil was not pushing it out. After cleaning the tensioner (spring was working again) - I put it back in - noise went away. To be safe - I ordered a new tensioner.

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