take off your fly wheel cover and stick a big screw driver in there to hold it in place then take off the nut, you don't need air tools not to mention you would need a big air gun to get that off like a 700 lb + impact gun i know my 500 lbs one didn't take it off. or you could do some backyard mechanics and throw on a breaker bar and turn over your engine a few times, that will get it off.