B - Operations – Transporting – 63 – H
Patent
B - Operations, Transporting
63
H
115/12, 123/149
B63H 5/125 (2006.01) F01N 13/00 (2010.01) F01N 3/04 (2006.01) F01P 3/20 (2006.01) F01P 11/06 (2006.01)
Patent
CA 1338696
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 manifold coolant jacket and through the exhaust pipe to an overboard discharge. The high-rise elbow and exhaust gas manifold coolant jacket includes a coolant discharge surface over which coolant is discharged from the high-rise elbow and exhaust gas manifold coolant jacket for flow to the exhaust pipe. In addition, the stern drive unit includes a coolant conduit communicating between the engine coolant jacket and the high-rise elbow and exhaust gas manifold coolant jacket and including an elevated portion extending at least as high as the discharge surface of the high-rise elbow and exhaust gas manifold coolant jacket and over which coolant the engine coolant jacket in response to engine operation. The provision of the elevated portion limits drainage of the coolant from the engine coolant jacket when the engine is not running and serves to interrupt a galvanic circuit between the engine block of one metal and another component of another metal.
608596
Ferguson Arthur R.
Rose Edgar
Outboard Marine Corporation
Smart & Biggar
LandOfFree
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