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(I hope I'm understanding you correctly)
If it is the same as my M102 (also 1992) this sounds like you're not routing the belt the correct way around the pulleys (assuming the belt is the right part)
For my car:-
With the belt routed correctly - big lower bolt loose (may be a 19mm?) - small upper adjuster (may be 13mm nut?) all the way at the top - adjuster wheel position can be moved freely to tension or not
Winding the top nut in / tightening makes the tension - pulling the tensioner wheel to the right - once the correct tension is shown - looking at the plastic pointer + checking for belt tension on longest stretch then tighten the big lower bolt.
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