Patent ID: 7874884
Filing Date: 2011-01-25
Classification: B63H,F01N,F01P

Abstract:
1. A method for controlling a marine engine comprising: providing a pump; pumping water from a body of water; providing said engine with an exhaust passage through an exhaust manifold and an exhaust elbow; providing said engine with a block and a head and a cooling passage through said block and said head; directing first, second and third portions of said water separately to cool the same said exhaust passage along first, second and third parallel flow paths, respectively; providing at least first and second flow control valves; providing said first flow control valve along said first flow path; providing said second flow control valve along said second flow path in series with said cooling passage through said block and said head, and in parallel with said first flow control valve in said first flow path; directing said first portion of said water along said first flow path through said first flow control valve to cool said exhaust passage; directing said second portion of said water along said second flow path in series through said cooling passage through said block and said head and said second flow control valve to cool the same said exhaust passage, in parallel with said first flow control valve in said first flow path; directing said third portion of said water along said third flow path to cool the same said exhaust passage, in parallel with said first flow control valve in said first flow path and in parallel with said second flow control valve and said cooling passage through said block and said head in said second flow path; controlling said first flow control valve according to a temperature condition of said exhaust passage; controlling said second flow control valve according to a temperature condition along said second flow path through said cooling passage through said block and said head.