water pump pulley

[georgeb]

I am in the process of trying to find out whats wrong with my tensioner. I have removed the radiator, loosened the 3 bolts on the water pump pully, removed the fan and the belt. I took the bolts off the water pump pully expecting the pully to just pull off. Somehow its stuck on there. I tried tapping it with a hammer and block of wood and i loosened it up somewhat but it still won't come off. What in the world could be holding it on there, corrosion? Any ideas on how to extricate the pully? Its a 95 c280. Also when i turn the pully i hear a little squeeking from the water pump. Does this indicate its on its way out?