for alternators in general, I usually need to bash out the bolt from the back. there's only a small bit of thread to hold the bolt but its very long, so turning it wont remove it. you've probably undone the bolt by now but its still held in place under tension. all the years of dirt and grime really add to the friction so sliding out the bolt often isnt an option and solvents definitely arnt an option to clean or lubricate the sleeve. so out comes a gentle persuader. a random picture from the internet but you get the idea.
