Patent ID: 7114469

Claim:
A cooling system for a marine propulsion engine, comprising: a first cooling system disposed in thermal communication with a first heat emitting portion of said engine; a second cooling system disposed in thermal communication with a second heat emitting portion of said engine; a pump configured to induce a cooling fluid to flow through said first and second cooling systems in first and second streams, respectively; a first outlet conduit connected in fluid communication with said first cooling system and configured to conduct said first stream away from said first cooling system, said first cooling system being connected in fluid communication between an outlet of said pump and said first outlet conduit; a second outlet conduit connected in fluid communication with said second cooling system and configured to conduct said second stream away from said second cooling system, said second cooling system being connected in fluid communication between an outlet of said pump and said second outlet conduit; a pressure responsive valve connected in fluid communication with said first outlet conduit; and a temperature responsive valve connected in thermal communication with said second outlet conduit, said first heat emitting portion of said engine being an exhaust conduit, said first cooling system comprising a first cooling branch conducting said cooling fluid serially from said pump to said exhaust conduit to said pressure responsive valve to said first outlet conduit, said second heat emitting portion of said engine being a combustion chamber of said engine, said second cooling system comprising a second cooling branch in parallel with said first cooling branch and conducting said cooling fluid serially from said pump to said combustion chamber to said temperature responsive valve to said second outlet conduit without flowing to said exhaust conduit, such that cooling fluid in said second cooling branch flows serially from said pump to said combustion chamber to said temperature responsive valve to said second outlet conduit without flowing to said exhaust conduit, and such that said temperature responsive valve controls cooling fluid flow to said combustion chamber but not to said exhaust conduit.