Hi Tom u need to get rid of the fan cowl and fan belt then from what i remember
the viscos fan has a allen key in the center and then theres the bit that the fan is on thats held on with 4 allen bolts or torx and behind that is a big bolt that holds the bottom pully on and its torqued up to 450nm and locktighted in so u need a big bar and something to lock the bottom pully with dont try and lock the fly wheel as you could damage it or the crank i got a long bit of steel that would reach the floor and welded a bar across the end that was shaped to fit into the pulley were you bolt the fan onto which then turned to the ground and locked the pully its a bitch without the real tool