"You can get a Selocs manual f
"You can get a Selocs manual from this site (check on the upper left of this screen), or alternately most marine dealers/Merc dealers will have the manuals in book form - generally sell for about 35 bucks...
Replacing that particular gasket is fairly simple - unless the motor has seen salt water and the bolts are corroded in place. If that's the case, unless you have a tap set and the ability to remove and re-tap busted bolts, then perhaps leave it for someone else. If this has been a freshwater motor, they should come out without any trouble..."