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Jack stand or no jack stand should not make a difference.

A few possibilities, whatever it is, do not drive the car until this is fixed.

Tensioner is off. Double check that the alignment tab is in the notch. When you tighen the tensioner, the cam lock and injection pump lock should be preventing their movement. The crankshaft too. The cam and Injection pump sprockets should be free to move so when you tighten the tensioner, it puts pressure evenly across the whole belt. It's possible that the injectino pump sprocket was all the way to one end so when you tightened the tensioner, it couldn't move any more and put the other things off and/or released the other items.

I suggest a recheck of everything. You don't have to remove the motor mount since you won't be completely removing the belt.

Put the engine at TDC. The myturbodiesel writeup only has a pic of a manual transmission TDC mark, if you have an auto, the mark should be at the bottom of the window. The tdiclub writeup has an auto trans pic.

With the engine at TDC, the camshaft lock and injection pump locks should be in place. I am guessing that they are currently not.

Also, when you adjust timing by loosening the 3 injection pump sprocket bolts, only loosen them slightly. If you loosen them too much, the pump will be free to move under the sprocket and it will mess it up. If you have intermittent start of injection error code under "Engine", then this is what happened.
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