jaguar s type 1999 lower ball joint?

i have an s type 3.0l v6 which needs a new o/s front lower ball joint. the hub and bearing assembly are held on with 4 bolts which has to be removed to get out old ball joint. the problem is that the hub is bonded onto the vertical link. does anyone know what sort of bonding/adhesive this is and what would counteract this for removal of hub assembly, cheers