kapalczynski wrote:
The "banging" initial shock vibrations breaks it free. If you don't hit it you just end up turning the whole engine over...at least thats what mine did.
Don't hit it hard, just a gentle tap with a normal hammer on the end of the large crescent wrench does the trick. I bought a 15" adjustable crescent wrench at harbor freight for ~$10.00 If you have on in the local area and its a useful tool for other stuff so you might as well keep it.

- Mark
The 2nd wrench is to prevent the pulley from turning which also hold the engine from turning. Two wrenches pulled together in opposite direction works wonders and you won't break nothing, not even your knuckles.