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MB "HAD" them changed to double row in the MID 80's, but I believe they all LEFT THE FACTORY with a simplex chain. MB would pay to have them changed. I will see if I can definitely confirm this.
The tensioner is on the side of the right cylinder head, above the alternator. On some models you may need to loosen the alternator belt and allow the alternator to drop to the side out of the way. The upper bolt is sometimes hard to get too, but with a little ingenuity it's an easy job.
Gilly
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