Patent ID: 7264520

Claim:
A cooling system of an outboard motor, comprising: a water pump; a first water conduit; a second water conduit, said water pump being configured to draw water from a body of water in which said outboard motor is operating and induce that water to flow through said first and second water conduits; an engine block having a plurality of cylinders formed therein; an engine block cooling passage disposed in thermal communication with said plurality of cylinders, said engine block cooling passage having an engine block inlet and an engine block outlet; an engine head attached to said engine block; an engine head cooling passage disposed in thermal communication with a plurality of combustion chambers disposed within said engine head, said engine head cooling passage having an engine head inlet and an engine head outlet, said first water conduit being connected in fluid communication with said engine head cooling passage; a heat exchanger; a first coolant conduit, said first coolant conduit being disposed in thermal communication with said second water conduit within said heat exchanger and with said engine block cooling passage; and a circulation pump disposed in fluid communication with said first coolant conduit.