Cooling arrangements and cooling water sprayers for marine engines

A marine engine comprising an internal combustion engine;

• an exhaust conduit that conveys exhaust gas from the internal combustion engine;
• a cooling water sprayer that sprays a first flow of cooling water into the exhaust conduit;
• and a cooling water jacket that conveys a second flow of cooling water alongside the exhaust conduit so that the second flow of cooling water cools the exhaust conduit, wherein the first flow of cooling water and at least a portion of the second flow of cooling water are merged and then sprayed together into the exhaust conduit via the cooling water sprayer;
• wherein the first and second flows of cooling water flow parallel with respect to each other before being merged.

A marine engine comprising an internal combustion engine;

• an exhaust conduit that conveys exhaust gas from the internal combustion engine;
• a cooling water sprayer that sprays a first flow of cooling water into the exhaust conduit;
• and a cooling water jacket that conveys a second flow of cooling water alongside the exhaust conduit so that the second flow of cooling water cools the exhaust conduit, wherein the first flow of cooling water and at least a portion of the second flow of cooling water are merged and then sprayed together into the exhaust conduit via the cooling water sprayer;
• further comprising a first strainer that strains the first flow of cooling water and the second flow of cooling water, and a second strainer that strains only the second flow of cooling water.

A marine engine comprising an internal combustion engine;

• an exhaust conduit that conveys exhaust gas from the internal combustion engine;
• a cooling water sprayer that sprays a first flow of cooling water into the exhaust conduit;
• and a cooling water jacket that conveys a second flow of cooling water alongside the exhaust conduit so that the second flow of cooling water cools the exhaust conduit, wherein the first flow of cooling water and at least a portion of the second flow of cooling water are merged and then sprayed together into the exhaust conduit via the cooling water sprayer;
• wherein the internal combustion is supported on an adapter plate and enclosed in an upper cowling;
• further comprising a lower cowling located below the upper cowling and extending below the adapter plate, and wherein the cooling water sprayer is located above the adapter plate so that it is accessible upon removal of the upper cowling while the lower cowling remains in place.

A marine engine comprising an internal combustion engine;

• an exhaust conduit that conveys exhaust gas from the internal combustion engine;
• a cooling water sprayer that sprays a first flow of cooling water into the exhaust conduit;
• and a cooling water jacket that conveys a second flow of cooling water alongside the exhaust conduit so that the second flow of cooling water cools the exhaust conduit, wherein the first flow of cooling water and at least a portion of the second flow of cooling water are merged and then sprayed together into the exhaust conduit via the cooling water sprayer;
• wherein the cooling water sprayer comprises an elongated body that extends through and is seated in a cross-bore in the cooling water jacket and the exhaust conduit.

A marine engine comprising an internal combustion engine;

• an exhaust conduit that conveys exhaust gas from the internal combustion engine;
• a cooling water jacket that conveys cooling water alongside the exhaust conduit so as to cool the exhaust conduit;
• a cooling water sprayer that sprays a portion of the cooling water into the exhaust conduit;
• and a strainer disposed in the cooling water jacket and configured to strain the portion of the cooling water before it enters the cooling water sprayer, and is sprayed into the exhaust conduit.

A marine engine comprising an internal combustion engine;

• an exhaust conduit that conveys exhaust gas from the internal combustion engine;
• a cooling water jacket that conveys cooling water alongside the exhaust conduit so as to cool the exhaust conduit;
• a cooling water sprayer that sprays a portion of the cooling water into the exhaust conduit;
• and a strainer disposed in the cooling water jacket and configured to strain the portion of the cooling water before it is sprayed into the exhaust conduit;
• wherein the sprayer is configured to merge the portion of the cooling water with another flow of cooling water from outside the cooling water jacket.