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Klaus,
I spent a hour or more re-torquing all the manifold bolts down. Only a few moved at all. You should also know that I removed the entire turbocharger and exhaust manifold to put the engine back together.
All of the manifold studs backed out when I took the head off, and I had to replace several when the manifold nuts welded themselves to the studs. After freeing up and replacing studs, I put all 10 (or so) studs back in, and then installed the manifold gaskets - copper gasket spray on the head-side, naked steel on the manifold-side.
Then I reinstalled just the manifold, tightening the manifold nuts down and later reinstalled the turbo.
The turbo was a nightmare. Especially when I went back through and re-tightened the manifold nuts.
I very much doubt that I have a loose manifold, but there is definitely a problem still.
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