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I have replaced the stretch belt on my son's e70 35d which has the M57 engine, but have no experience with the tensioner setup.
Which bolt(s) is it that you're having trouble with exactly? I think it is the 2 bolts that attach the belt tensioner (part 3 in the realoem diagram). I think (but am not certain) that you are trying to attach them after affixing the bracket to the engine. If that is true, then (as I read the instructions) that is the incorrect way to do it. It seems the belt tensioner is put in place and the bolts are started (but not tightened apparently) before attaching the bracket to the engine. Then once the bracket is in place, the tensioning lever is placed and the attachment bolt (looks like part number 8 in the diagram, though it is greyed out and no part number given in the diagram) is threaded in to affix the tensioning lever. Then all the bolts are tightened up. Not sure if you have room to do that or not, but that is way I read it.
Of course, I could be misunderstanding and maybe you tried what I talk about above. In that case, I don't have any other ideas (other than go back to the stretch belt).
Good luck. Let us know what happens.
Stephen
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Stephen
2010 e70 35d- now driven by son #2
2005 e53 3.0 - now driven by son #1
2021 G05 45e PHEV - now driven by me
2008 ML320 CDI - driven by wife
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