Marine propulsion device with coolant water passages

A marine propulsion device comprising an internal combustion engine including an engine block comprising a cylinder, a first water jacket, a water jacket outlet port communicating with said first water jacket, and a lower face having therein an exhaust outlet port communicating with said cylinder, a drive shaft housing, a propeller shaft rotatably supported by said drive shaft housing and adapted to support a propeller, a drive shaft extending through said drive shaft housing and including an upper end driven by said engine and a lower end drivingly connected to said propeller shaft, and an exhaust housing located at least partially within said drive shaft housing so that said exhaust housing and said drive shaft housing define therebetween a second water jacket, said exhaust housing including an exhaust passage communicating with said exhaust outlet port, an upper end, a flange portion located adjacent said upper end, a first passageway extending through said flange portion and communicating with said water jacket outlet port, and a second passageway having an inlet communicating with said first passageway, and an outlet communicating with said second water jacket and extending substantially horizontally between said inlet and said outlet.

A marine propulsion device comprising an internal combustion engine including an engine block having therein a water jacket and having a lower face, a drive shaft housing connected to said lower face of said engine block, a propeller shaft rotatably supported by said drive shaft housing and adapted to support a propeller, a drive shaft extending through said drive shaft housing and including an upper end driven by said engine and a lower end drivingly connected to said propeller shaft, an exhaust housing located at least partially within said drive shaft housing and including an upper face mating with said lower face of said engine block, a recess located in one of said lower face of said engine block and said upper face of said exhaust housing, a water passage extending in said recess and defined by said recess and by the other of said lower face of said engine block and said upper face of said exhaust housing, said water passage having an inlet in one of said upper face and said recess, and an outlet which is located in one of said lower face and said recess, which is spaced horizontally from said inlet, and which communicates with said water jacket, and means connected to said inlet for supplying water to said inlet.