Friend the best way is to take out the spark plug number one and turn the crankshaft until the piston is in the upper dead point, then Czech Aver if some mark blocks you with any of the engine if it does not block anything to you, take another return to the followñal and it reaches the same point, if there are still nothing then you have marked you before disassembling the belt some between the mail and the tool and others with respect to the pulleys and the engine will be more easy to put it.