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Old 07-13-2012, 08:32 PM
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glenmore glenmore is offline
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Join Date: Sep 2002
Location: Los Angeles
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In the case of belt tensioners for older Mercedes, the cost/benefit is definitely on the side of an OEM part. Plus, I would guess that a MBZ part would have some sort of warranty. If you bought a URO part (~$60) instead of a FEBI part (~$125) or instead of a genuine Mercedes (~$225), you get what you pay for. If changing your belt tensioner is anything like my past 91 300CE, the hassle alone is worth the extra money of an OEM part.

A quick check of a good w124 tensioner out of the box, is the point where the pulley attaches should lie between the 2 parallel lines drawn off the flats of the bushing where the tensioning rod is attached.
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