How do you remove crankshaft harmonic pulley for 2004 Nissan xterra v-6?

You will need to first drain and remove the radiator to give clearance. Then, you have to loosen and remove all three accessory belts. Also, you will need a 2 or 3 jaw gear puller. Remove the bolt holding the pulley on by using a large breaker bar. To do this, you will have to put the emergency brakes on HARD. Then, using the puller, remove the crankshaft pulley.

If you are doing this to change your timing belt, you will have to remove a bunch of other stuff.

Good luck.