it's an om606. no picture there isn't quite a point. it's cut and dry.

I'd love to know if it's as simple as tightening the tensioner.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k