I have taken off the four bolts, fan clutch isn't coming off. There is a large nut on the shaft, is that what is holding it on? If so, does it loosen clockwise or counter?

 

I don't recall seeing that type system on a gas engine, but it was on a diesel 7.3 engine and it was a left hand thread on those meaning it was loosened by turning clockwise. When the two wrenches that were required to loosen it were not available ,a sharp rap on a long heavy screwdriver on the nut flat was usually enough to break it loose.

 

i would post a photo, but apparently I can't....