Abstract: An exhaust system is for a marine propulsion device having an internal combustion engine. A catalyst housing has a housing inlet end that receives an exhaust gas flow from the internal combustion engine into the catalyst housing and an opposite, housing outlet end that discharges the exhaust flow out of the catalyst housing. A catalyst is disposed in the catalyst housing. The catalyst has a catalyst inlet end that receives the exhaust gas flow and an opposite, catalyst outlet end that discharges the exhaust gas flow. A catalyst mantel is on an outer periphery of the catalyst. The catalyst mantel has a mantel inlet end and an opposite, mantel outlet end. A radial flange is on at least one of the mantel outlet end and mantel inlet end. A connector mates with an inner diameter of the catalyst housing. The radially extending flange of the catalyst mantel is axially sandwiched between the connector and a radially inner shoulder of the catalyst housing.

Abstract: An exhaust system is for a marine propulsion device having an internal combustion engine. A catalyst housing has a housing inlet end that receives an exhaust gas flow from the internal combustion engine into the catalyst housing and an opposite, housing outlet end that discharges the exhaust flow out of the catalyst housing. A catalyst is disposed in the catalyst housing. The catalyst has a catalyst inlet end that receives the exhaust gas flow and an opposite, catalyst outlet end that discharges the exhaust gas flow. A catalyst mantel is on an outer periphery of the catalyst. The catalyst mantel has a mantel inlet end and an opposite, mantel outlet end. A radial flange is on at least one of the mantel outlet end and mantel inlet end. A connector mates with an inner diameter of the catalyst housing. The radially extending flange of the catalyst mantel is axially sandwiched between the connector and a radially inner shoulder of the catalyst housing.

Abstract: An exhaust system is for a marine propulsion device having an internal combustion engine. A catalyst housing has a housing inlet end that receives an exhaust gas flow from the internal combustion engine into the catalyst housing and an opposite, housing outlet end that discharges the exhaust flow out of the catalyst housing. A catalyst is disposed in the catalyst housing. The catalyst has a catalyst inlet end that receives the exhaust gas flow and an opposite, catalyst outlet end that discharges the exhaust gas flow. A catalyst mantel is on an outer periphery of the catalyst. The catalyst mantel has a mantel inlet end and an opposite, mantel outlet end. A radial flange is on at least one of the mantel outlet end and mantel inlet end. A connector mates with an inner diameter of the catalyst housing. The radially extending flange of the catalyst mantel is axially sandwiched between the connector and a radially inner shoulder of the catalyst housing.

Abstract: An exhaust manifold is for an internal combustion engine on an outboard marine engine that is configured to power a propulsor to provide a thrust in a longitudinal direction. The exhaust manifold comprises an exhaust runner that transversely and longitudinally rearwardly conveys the exhaust gas from the internal combustion engine, an exhaust log that vertically upwardly conveys the exhaust gas from the exhaust runner, and an exhaust elbow that conveys the exhaust gas from the exhaust log vertically upwardly, longitudinally forwardly, and then vertically downwardly.

Abstract: A stern drive for a marine vessel comprises an internal combustion engine that extends in a longitudinal direction, a horizontal direction that is perpendicular to the longitudinal direction, and a vertical direction that is perpendicular to the longitudinal direction and perpendicular to the horizontal direction. An engine output shaft extends in the longitudinal direction and is driven to rotate by the internal combustion engine. A cooling water sea pump is powered by rotation of the engine output shaft to pump cooling water to the internal combustion engine. The cooling water sea pump comprises a first pump input shaft that extends parallel to the engine output shaft, a second pump input shaft that extends transversely to the first pump input shaft and is driven to rotate by the first pump input shaft, and an impeller that is driven to rotate by the second pump input shaft to pump the cooling water to the internal combustion engine.

Abstract: A marine propulsion device has an internal combustion engine that discharges exhaust gases, a driveshaft housing that is located vertically below the engine, and a catalyst that is sandwiched between opposing castings of the device that face each other at a split-line. The exhaust gases flow through the catalyst parallel to the split-line.

Abstract: An internal combustion engine and a method of forming an internal combustion engine are for a marine propulsion device. A first engine casting defines a first flow passage configured to receive the exhaust gases from a piston-cylinder. A die cast second engine casting defines a second flow passage that is configured to receive the exhaust gases from the first flow passage and convey the exhaust gases to a catalyst. The second flow passage has an upstream first leg that is parallel to the first flow passage and a downstream second leg that is transversely oriented to the first leg. An inside corner is between the first and second legs. The second flow passage has an inlet end that is configured to receive exhaust gases from the first flow passage. The first flow passage has an outlet end that is configured to convey exhaust gases to the inlet end of the second flow passage.

Abstract: An outboard marine propulsion device comprises an internal combustion engine. At least one engine cooling passage conveys cooling water through the internal combustion engine. An exhaust manifold comprises a plurality of exhaust runners and an exhaust log. The plurality of exhaust runners axially conveys exhaust gases from the internal combustion engine to the exhaust log. A cooling jacket on the exhaust manifold comprises an exhaust log cooling jacket that conveys the cooling water along an outer surface of the exhaust log and a plurality of exhaust runner cooling passages that each axially convey the cooling water along an outer surface of a respective one of the plurality of exhaust runners from the exhaust log cooling jacket to the engine cooling passage.

Abstract: A marine engine for an outboard motor comprises a bank of piston-cylinders, an intake camshaft that operates intake valves for controlling inflow of air to the bank of piston-cylinders, an exhaust camshaft that operates exhaust valves for controlling outflow of exhaust gas from the bank of piston-cylinders, and a cam phaser disposed on one of the intake camshaft and exhaust camshaft. The cam phaser is connected to and adjusts a timing of operation of the other of the intake camshaft and exhaust camshaft with respect to the one of the intake camshaft and exhaust camshaft.