Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 76Get this manual
Powerhead Removal from Lower Unit Remove lower cowl from engineRemove hex nuts (a) that secure powerhead to lower unitDisconnect all parts and components that are connected to bottom cowlMove powerhead back and forth to break gasket between powerhead and exhaust plateLift powerhead from engine and place on bench or powerhead stand