u need to take off service plate for the fly wheel at the bottom and lock the flywheel in place with a prybar or big flat screwdriver. once lock in place, use 17mm socket with 3feet 1/2in extension and 1/2in drive breaker bar. longer breaker bar u use, the easier it'll be to loosen. and just turn counter clock to loosen. when u pull out the harmonic, make sure u don't loose the small lockpin that locks pulley in place. goodluck