Stern drive unit with galvanic protection system

Abstract From the Canadian patent

Disclosed herein is a stern drive unit comprising an engine including an engine coolant jacket and an exhaust port, and an exhaust gas discharge system including an exhaust gas manifold communicating with the exhaust port, a high-rise elbow communicating with the exhaust gas manifold and an exhaust pipe communicating with the high-rise elbow and adapted to convey exhaust gas to an overboard discharge. The stern drive unit also comprises a high-rise elbow and exhaust gas manifold coolant jacket surrounding the exhaust gas manifold and at least partially surrounding the high-rise elbow and communicating with the exhaust pipe for discharge of coolant from the high-rise elbow and exhaust gas …