Look downward behind the fan and you'll see a large nut (about 1 7/16") attaching the fan clutch to the water pump pulley. You have to turn this bolt counter clockwise while keeping the water pump pulley from turning."how can i keep the pully form turning on the water pump so i can get the big nut loose?
you could cinch and old soft leather belt around it, but then you'd have to find a place to post the end of the belt...could bear down on, and jam something like a book of matches in the belt to stop it from turning...an impact pressure will work better than a steady pressure in this appication.
They also make a tool for this purpose called a Water Pump Clutch tool, it holds the pulley by the 2 pulley bolts that you hold in one hand while you move your wrench turning the fan clutch nut in the other hand. Another trick without using the clutch tool is to strike the end of the wrench turning the big nut with a hammer on the very top to shock the nut loose. But do this at your own risk, because you can miss breaking something or rounding off the nut.
Like a duckfoot tool for a harmonic balancer/crankshaft pulley puller
like a pulley puller one might use to replace a GM harmonic balancer~ every grease monkey has one of these collecting dust~
...or slip and put a wrench into the harrison~
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