get a big spanner, can't remember the size but viscous spanners are available from halfords for a few quid.

hold the pulley and undo the nut. I think its left hand thread, been a while since i took one off
 
yup, its a left hand thread, i borrowed one of the special spanners off a mate to do mine, hold the fan blade and hit the spanner with a hammer, piece o ****, they sell em on ebay ;)
 
32mm "special" as in thin to get kin in there,I made one by welding a bit of thin steel up.
 
Trade lads use a long 3/8" drive socket extension with a blow with a large hammer. left hand thread on a 300tdi. But thin long spanner size is 32mm, for the purists out there!!!
 

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