Fan Clutch

[Marlin]

i left the belt on, and used a 10mm (i think) box end wrench with a small pipe on the end of it, then used a rubber mallet to hit the end of it, that basically replicates an impact wrench

I used a large box end and wedged it in the fan to minimize rotation, then I hit the 10mm wrench with a mallet, same concept, it was a PITA, and resulted in a little bleeding from rubbing against the radiator.
I didn't do the balancing thing, nor did mine look like the mount in the picture? No problems, mine sounds like a semi now, and no cooling problems.
Have fun...