I recall reading a post years ago where a member loosened the alternator and tightened the serp. belt that way. I have never tried this.

8 yrs. ago I replaced the belt tensioner on my M103 engine with a German-made Febi. It's holding up OK, but I've never thought the belt tension was as taught as it could be. Domestic and Asian tensioners get the serp. belt TIGHT. Some have said I should have used an OEM tensioner. The car had relatively low mileage when I bought it 21 yrs. ago and still had the OEM tensioner. Belt tension at that time was no better than what I got out of the German-Febi.

I agree. The design of this tensioner was not handled well.

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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"