You may need to use a breaker bar. I recomend using a 1/2 drive, impact gun. If you use heat, you can damage your crank seal or melt the timing belt cover! The bolt is RH threaded. There is a key-pin that holds the crank to the shaft. Once bolt is removed, it's all down hill. It should be a 17mm or an 11/16 may work. Good luck...