Umm, I'm just wondering if the M103 is the same engine I have, I'm not familiar with these numbers yet, but I have a 85 190E 2.3, and I broke two tensioners trying to correctly tighten the belt, so maybe I will forget that and do it the alternator way, it sounds doable. I will still need to get a new tensioner since that adjustment screw holds it in place, and without it I found the tensioner slowly sliding down and resulting extra slack of the belt.

Right now my belt is all over the place, but everything still works.

xp

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1985 190E 2.3L - a constant project.