You could try removing the bush by finding a piece of round bar that's a close but sliding fit in the bush you want to remove. Then fill the bush and the space behind it with heavy grease; try not to leave any air bubbles, put the bar back into the bush and start hitting the end of the bar with a hammer.
The hydraulic action should push the bush out of the housing. I've used this method lots of times to get the manual transmission spigot bushes out of the rear end of crankshafts. It can be a bit messy if the bar isn't a very close fit in the bush, but winding a small amount of PTFE tape around the bar helps to make a good seal.
Last edited by Stuart_Giles; 12/17/2010 11:56 AM. Reason: grammar!