turn the crank via the centre bolt using a socket in a clockwise rotation. there is a mark on the pulley that lines up with a mark 0 on the timing cover. this is towards the top. then check the cam pulley. there is a mark that lines up with an arrow on the backplate at approx 5 0 clock. this is then set at tdc, allowing you to safely remove the cambelt, and do any other work required. ensure that when the engine goes back together that the cam mark is in roughly the right place. fit a new cambelt as well.