System and method for cooling a marine outboard engine

摘要

A marine outboard engine is described, having an engine disposed in a cowling. The engine has a cooling system. A first pump is disposed inside the cowling below a water line of the outboard engine. The first pump is continuously driven by the engine during operation of the engine. The first pump is a centrifugal pump having an inlet in fluid communication with an exterior of the marine outboard engine below the water line and an outlet in fluid communication with the cooling system. A second pump is disposed inside the cowling below the water line. The second pump has an inlet in fluid communication with an exterior of the marine outboard engine below the water line and an outlet in fluid communication with the cooling system. An electric motor is operatively connected to the second pump for selectively driving the second pump during operation of the engine.