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I remember tw differant types, on witha nut on it....and that's easy, as it's a woodruff key arrangement.....later on,and I forget the changeover year, they went to a press on pulley, save a nickel in machine work....well anyway, you now need a puller to get the pulley off, and then just a nut/bolt arrangement with large washer to press it on again....pain in the butt for 5 cents forth of machine work....
There is a special puller that you must use. There is a groove on the snout of the pulley that the puller will engage to pull the pulley from the drive shaft. Some of the major automotive parts stores will loan the tool for free. You will also have to use a bolt threaded into the end of the drive shaft along with a washer and nut to draw the pulley onto the pump drive shaft. Do NOT press directly on the end of the drive shaft. You will break parts inside the pump if you do! :smash: :nono:
Good advice. They also sell a combined remover/installer in a set & plastic case. It's the same tool reboxed for many different stores. Some places charge $60 for it, some charge $36 for it. I used mine last week and even with the tool, it was a PITA. The set has a pilot that screws into the pump shaft to avoid messing up the internal threads, and a roller bearing to ease the pain. I agree... stupid design to save a nickle.
I have the proper puller and it was still a real problem. Mine is a 75 and even with the proper puller I ended up using heat. It did take alot of effort to remove. Installation was simple with the bolt and washer.
I built the puller and installer for mine out of scrap iron. It's just a matter of carefully fitting the piece that goes into the groove on the pulley so it fits tight. It doesn't look pretty, but it sure does work good.
You definately only want to use a special puller that engages the groove around the hub. Do not try and use a generic big puller with legs that engages the pulley out by the belt grooves. You will bend and distort the pulley and you will have junk. :eek: