are you replacing it then air chissel to turn the 36mm nut but only to get startet once it starts it turns easy if not then a 36 wrench and hold the waterpump dont forget lefthand threat on a lot of them

Hi, thanx for that. I got the fan off but can't get to the nut as there is a plate that I can't figure out how to remove.

COOLING SYSTEM FAN For additional information, also refer to the Viscous Fan Drive. REMOVAL Fan belt removal is not necessary to remove cooling system fan. Disconnect the negative battery cable at battery. Remove the plastic air cleaner intake tube. Remove two-piece fan shroud Fan Shroud Remove lower half first. The thermal viscous fan drive/fan blade assembly is attached (threaded) to the water pump hub shaft Fan Blade/Viscous Fan Drive Assembly Remove the fan blade/fan drive assembly from water pump by turning the mounting nut counterclockwise (as viewed from front) Threads on the viscous fan drive are RIGHT HAND. A Snap-On 36 MM Fan Wrench (number SP346 from Snap-On Cummins Diesel Tool Set number 2017DSP) can be used. Place a bar or screwdriver between the water pump pulley bolts Fan Blade/Viscous Fan Drive Assembly to prevent the pulley from rotating. Do not unbolt fan blade assembly Fan Blade/Viscous Fan Drive Assembly from the viscous fan drive at this time. After removing fan blade/fan drive assembly do not place the thermal viscous fan drive in the horizontal position. If stored horizontally, the silicone fluid in the viscous fan drive could drain into its bearing assembly and contaminate the bearing lubricant CAUTION: Do not remove the water pump pulley-to-water pump bolts Fan Blade/Viscous Fan Drive Assembly This pulley is under spring tension. Remove the four bolts securing the fan blade assembly to the viscous fan drive Fan Blade/Viscous Fan Drive Assembly INSTALLATION Install fan blade assembly to viscous fan drive. Tighten bolts Fan Blade/Viscous Fan Drive Assembly to 23 N·m (17 ft. lbs.) torque. Install the fan blade/viscous fan drive assembly to water pump shaft Fan Blade/Viscous Fan Drive Assembly Install fan shroud. Install air cleaner intake tube. Connect negative battery cable.