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A cooling system for a marine engine divides a flow of cooling water into first and second streams downstream of a pump. The first stream flows through a first cooling system which is controlled by a pressure sensitive valve. The second stream flows through a second cooling system which is controlle

A cooling system for a marine engine divides a flow of cooling water into first and second streams downstream of a pump. The first stream flows through a first cooling system which is controlled by a pressure sensitive valve. The second stream flows through a second cooling system which is controlled by a temperature sensitive valve.

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I claim: 1. 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 c

I claim: 1. 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. 2. The cooling system of claim 1, wherein: said pump is a water pump having an inlet disposed in fluid communication with a body of water. 3. The cooling system of claim 2, wherein: said first outlet conduit is configured to conduct said first stream away from said first cooling system and toward said body of water. 4. The cooling system of claim 2, wherein: said second outlet conduit is configured to conduct said second stream away from said second cooling system and toward said body of water. 5. The cooling system of claim 1, further comprising: a third cooling system disposed in thermal communication with a third heat emitting portion of said engine, said third cooling system being connected in serial fluid communication with said second cooling system between said pump and said second outlet conduit. 6. The cooling system of claim 5, wherein: said third heat emitting portion of said engine is a cylinder of said engine. 7. The cooling system of claim 1, wherein: said first heat emitting portion of said engine is a common exhaust conduit formed in a head portion of said engine. 8. The cooling system of claim 1, wherein: said second heat emitting portion of said engine comprises a cylinder within a block portion of said engine and a combustion chamber within a head portion of said engine. 9. 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, said pump being a water pump having an inlet disposed in fluid communication with a body of water, said first outlet conduit being configured to conduct said first stream away from said first cooling system and toward said body of water, said second outlet conduit being configured to conduct said second stream away from said second cooling system and toward said body of water; 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. 10. The cooling system of claim 9, further comprising: a third cooling system disposed in thermal communication with a third heat emitting portion of said engine, said third cooling system being connected in serial fluid communication with said second cooling system between said pump and said second outlet conduit. 11. The cooling system of claim 9, wherein: said third heat emitting portion of said engine is a cylinder of said engine. 12. The cooling system of claim 9, wherein: said first heat emitting portion of said engine is a common exhaust conduit formed in a head portion of said engine; and said second heat emitting portion of said engine comprises a cylinder within a block portion of said engine and a combustion chamber within a head portion of said engine. 13. 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, said first heat emitting portion of said engine being a common exhaust conduit formed in a head portion of said engine, said second heat emitting portion of said engine comprising a cylinder within a block portion of said engine and a combustion chamber within a head portion of said engine; 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 cooling system comprising a first cooling branch conducting said cooling fluid serially from said pump to said common exhaust conduit to said pressure responsive valve to said first outlet conduit, 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 common exhaust conduit, and such that said temperature responsive valve controls cooling fluid flow to said combustion chamber but not to said common exhaust conduit. 14. The cooling system of claim 13, wherein: said pump being a water pump has an inlet disposed in fluid communication with a body of water, said first outlet conduit being configured to conduct said first stream away from said first cooling system and toward said body of water, said second outlet conduit being configured to conduct said second stream away from said second cooling system and toward said body of water.