If timing is off it is most likely due to a streched timing chain. But to reset timing, you need to loosen (do not remove yet) cam bolt, remove 12mm bolt and spring from tensioner, remove tensioner, remove cam gear enought to rotate tooth at a time until the timing marks align. Make sure the "T" in the flywheel is lined up with the notch in the inspection hole, and the cam lobes are down, when you do this. You will need a 17mm socket for the cam bolt, 8mm socket for the tensioner bolts, 12mm for the tensioner spring cap, and a torque wrench.