If you've got an FSA crankset, it's highly unlikely that you have a bottom bracket that is serviceable. FSA is a relatively new brand, I think, and mainly comes on nicer bikes. And most nice-ish bikes for the past 15 years, at least, have come with sealed-cartridge bottom brackets.

Can you say more about your bike and crankset and bottom bracket? FSA has made square-taper cranks, ISIS-spline-interface cranks, and now integrated crank/bb systems with external bearings.