I'm trying to change the timing belt on my 2004 Chevy Aveo and I'm having problems with the water pump. I've removed the 3 screws that keep it in place and I also removed the the tensioner pulley, idler pulley, and the camshaft wheels to remove the inner cover; the water pump simply refuses to come out. I tried turning it with the 41mm water pump wrench and nothing. I tried WD-40 and that didn't work. I tried pulling it by hand and nothing. Is there anything else I can try to remove the water pump?