I just bough a 1989 cadillac Fleetwood Brougham with a 307 Y in it. I'm having some trouble loosening up the air pump in order to install a new belt. I know there's one adjustment nut on the front but that doesn't seem to loosen it up enough. Does anyone know if theres another nut hiding somewhere in there? Or if someone knows the trick to loosen and tighten that belt I would much appreciate it. Thanks.