My alternator bearing is out so I'm in the process of installing a new alternator. I have my radiator out and I can't figure how to take the clutch fan off. The large nut behind the blades just spins. I'm also not sure if it is a standard thread or reverse thread. Any tips or tricks would be very helpful. It's a 2000 4.4 X5

Thanks

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2005 F250 Harley Davidson, 8 inch Rize four link lift, 37's on 22's, SCT, Hog and all the goodies.
2003 RC51 far from stock
2001 CR500 Built to the hilt
Special Construction TRX with a 510 Sabertooth motor
1995 STV Euro Ski, 2.5 Merc