Working on my 88 190e 2.3 replacing the belt tensioner and shock, etc. There is a spinning bolt on one of the brackets (see picture) I don't believe there is a nut behind. What can I do? It is the top bolt on the bracket. Also how do I remove the torx bits holding the cooling fan pulley? (Don't say carefully) Thanks

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There IS a nut back there. I remove the center bolt to remove the cooling fan when I replace the belt tensioner.
Why do you need to remove the pulley?

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible

You are right! Found the nut. Tensioner is out. So glad I don't have to remove the torx bits from the cooling fan pulley. At least on the removal. Parts arrive tomorrow. Thanks!

Thanks SLK. I have another question. The adjusting rod at the base has a clip that holds the adjusting rod to the circle. Should the rod be in the clip or outside the clip when it's installed?

Never mind, figured it out. It's fell into place. Alls well!