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View Full Version : Overheating new 90 hp marine engine



boydy
10-16-2010, 05:02 PM
i have a john deere marine engine 90 hp new and it keeps over heating and now there is oil in the water can anyone help

portengineers
09-27-2011, 12:09 PM
probable popped the head gasket. repair as needed ,clean raw and fresh water sides of cooling system. check that the engine makes rated rpm and not over propped . and away you go