Why would you turn the engine counter clockwise? If you were able to turn it clockwise through at least two complete revolutions you should be good to go.
If you haven't fired up the engine since the chain and tensioner replacement, the tensioner hasn't pumped up and only the spring tension of the tensioner is supporting the chain.
Roll it over clockwise through two complete revolutions yet again, to be sure you haven't messed with the cam timing. If all goes well, put it back together and fire it up.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.