Guys n gals, i'm hoping once again to garner your knowledge. I took my boat out of the water today to give it a bit of a scrub, and while on dry land I decided to check the oil level in the sterndrive... bad move. When I took the dipstick out, it was very milky. I pulled the prop off to get a closer look and saw a little bit of milky oil leaking from the oil seal. I need to replace the seal, and my problem is I dont know how to remove the housing (see explanded diagram)
I've removed the two retaining screws, but the housing is jammed solid. I'm wondering if there is a special tool to remove this, or should a bit of jiggling with a hammer and screwdriver plus a bit of heat, be enough to shift it?
Anyone ever tackle this kind of job before... help, advice, tips or general ridicule all welcome

I've removed the two retaining screws, but the housing is jammed solid. I'm wondering if there is a special tool to remove this, or should a bit of jiggling with a hammer and screwdriver plus a bit of heat, be enough to shift it?
Anyone ever tackle this kind of job before... help, advice, tips or general ridicule all welcome