I have a 2007 Chevrolet Impala 3.5 V6 that I just replaced the water pump. In the process when I put the belt back into position it is now looser than what it should be so my question is what is the process to tighten the belt. Is it by tightening the 13 mm bolt on the tensioner pulley? Not a mechanic so what might be simple for some is not obvious to me.