I am trying to change the water pump on my 99 Nissan Frontier 2WD 4
Cylinder. The water pump has completeyl failed.

I ahve the new water pump in hand but I can seem to get the pulley and
fan clutch assembly removed from the water pump so I can actually
remove the water pump.  I only have the generic Frontier/Pathfinder
Haynes manual and it skips over the steps.

I have the fan off the clutch and the 4 nuts that I thought were
holding the fan clutch and pulley to the water pump removed.
Unfortunately the pulley and clutch won't come off at all.

Appreciate any thoughts.