Aw. It's an old Eaton's bike. How did it get wrecked?
Anyway, after loosening the expander wedge bolt (on the top of the stem) you tap it with a hammer. This should loosen the wedge and allow the stem to be removed from the steerer tube of the fork. You don't remove the wedge bolt completely, because there's no need to, and it keeps all the parts of the stem together.
Once this is done, most of the upper headset parts can be removed by just unscrewing them.
Last edited by Torchy McFlux; 10-23-08 at 10:35 PM.