TOPIC: 72' Merc 500, Impeller rusted/fused to drive shaft

Hi Guys(gals too! LOL):
Need some help here. Trying to replace water impeller and the impeller won't slide off drive shaft. I've soaked it in PB rust blaster, tapped it, tried a pliers to pull it off and it won't budge (tears up rubber on impeller no movement of whole impeller).
Am I doing something wrong?
All the videos show the impeller just sliding off the drive shaft. HelP!

It's rusted to the shaft, take a chisel or sharpened screwdriver to it and split the brass insert. Then clean up the shaft real good, so that the new impeller will slide right down with no binding. You'll probably waste the impeller key, it's a good idea to replace anyway, and they're cheap.

HTH.........ed

Thanks Ed for the quick reply! I figured I'd have to do someting like that ...but I wanted to make sure There wasn't some little trick part to removing it first..befor I broke something>
Delvel