Paluce

Here's my question. I have the new timing belt on the cam gears, everything is lined up. The auto tensioner is bolted up, and the tool had been pulled off the tensioner.

My question is, since the timing belt dosn't seam tight right now, I think i need to do something with the long 10mm bolt that sticks through the plastic timing cover. It's tight right now, do I need to loosen it, to get tension on the belt, then tighten it again?

Thanks,