my name is jack and im missing an important step???? i am replacing a headgasket on 95 c220 2.2 [111.961] engine, as i tighten tensioner the crank wont turn. if i back off tensioner 1/4 in it will turn. im reading off mitchell shop key, i marked sprockets and can turn two revolutions and sprockets come up at same spot on sprockets and damper. have taken tensioner apart but no difference. i didnt take cam adjuster apart,and i marked it and pinned cams??? thank you jack