Outboard Marine Corporation

John C Hervat

Matthew H Mondek

Harold L Osborn

Roger B Whipple

Norman C Franke

Gregory M Umek

Danny I Clark

Disclosed herein is an outboard motor comprising an internal combustion engine including a lower surface having therein an exhaust gas discharge port, a drive shaft housing having an upper end including an upper face fixed to the lower surface of the internal combustion engine, an outer surface extending downwardly from the upper face, an interior vertically extending main exhaust gas passage extending from the upper face and communicating with the exhaust gas discharge port, an idle exhaust gas relief passage recessed in the upper face and in spaced relation to the main exhaust gas passage, and closed by the lower surface of the internal combustion engine, and an idle exhaust gas outlet port located in the outer surface and communicating with the idle exhaust gas relief passage, and an idle exhaust gas relief tube communicating between the main exhaust gas passage and the idle exhaust gas relief passage and having a portion extending vertically within the main exhaust gas passage and terminating in spaced relation above the water level in the drive shaft housing when the drive shaft housing is located in a normal operating position and when the drive shaft housing is at rest relative to the water.

Idle exhaust gas relief arrangement for outboard motor

A marine propulsion device comprising a propulsion unit including an internal combustion engine, the engine comprising a cylinder, a water jacket, a water jacket inlet port communicating with the water jacket, and a lower face having therein an exhaust outlet port communicating with the cylinder, the propulsion unit also including a drive shaft housing having a lower end, a gearcase connected to the lower end of the drive shaft housing, a propeller rotatably supported by the gearcase, a drive shaft which extends through the drive shaft housing and which includes an upper end driven by the engine and a lower end drivingly connected to the propeller, and an exhaust housing located at least partially within the drive shaft housing and connected to the lower face of the engine, the exhaust housing comprising an exhaust passage located interiorly of the exhaust housing and communicating with the exhaust outlet port, a water intake port, and a water intake passage located interiorly of the exhaust housing and communicating between the water intake port and the water jacket inlet port, and a water pump having an outlet communicating with the water intake port.

Marine propulsion device

A marine propulsion device comprising a transom bracket adapted to be mounted on the transom of a boat and having a side and upper surface, the marine propulsion device further comprising a swivel bracket mounted on the transom bracket for pivotal movement relative to the transom bracket about a generally horizontal tilt axis and between an operating position and a raised position, a propulsion unit including a rotatably mounted propeller and being mounted on the swivel bracket for pivotal movement relative to the swivel bracket about a generally vertical steering axis, a tilt lock shaft having first and second ends extending through the swivel bracket along a second generally horizontal axis spaced rearwardly from and substantially parallel to the tilt axis, a lever member mounted on the shaft and including a contact pad extending parallel to and radially offset from the second axis and further including at least one leg extending substantially perpendicularly relative to the contact pad, and manually operable structure for rotating the tilt lock shaft between a lock position, wherein the leg extends along the side of the transom bracket and the contact pad engages the upper surface of the transom bracket to prevent movement of the swivel bracket from the raised position to the operating position, and a release position wherein the contact pad disengages the transom bracket to permit the swivel bracket to move from the raised position to the operating position.

Growing community of inventors

Kenosha, WI, United States of America

John C Hervat