2001 nissan pathfinder 3.5 V6 4×4 automatic

I am working on replacing my water pump. I have gotten all the way to removing the timing chain tensioner to produce slack, then turning the crank shaft 20 degrees counter clockwise to move that slack over to the water pump so I can slip it off the water pump sprocket this did not work so how do you get slack on the timing chain around the water pump?