Abstract: Disclosed herein is an oil pump assembly comprising a housing member including a first mounting surface, a cover member mounting surface spaced from the first mounting surface, a bore extending from the cover member mounting surface and including, adjacent the cover member mounting surface, a counter bore, an oil supply passage extending between the first mounting surface and the cover member mounting surface for communication with an oil supply source, and an oil delivery passage extending between the first mounting surface and the cover member mounting surface for communication with an oil delivery conduit, a cover member including a housing member mounting surface fixed to the cover member mounting surface of the housing member, an other mounting surface, an oil supply recess located in the housing member mounting surface and communicating with the counter bore in the housing member, an internal oil supply conduit communicating between the oil supply recess and the housing member mounting surface and commu

Abstract: Disclosed herein is an outboard motor including an engine block assembly comprising an engine block, a crankshaft rotatably supported by the engine block and including an upper part above the engine block, a flywheel fixed on the upper part of the crankshaft, a recoil starter above the flywheel, a crankshaft timing gear fixed on the upper part of the crankshaft, a camshaft rotatably supported by the engine block and including an upper part above the engine block, a camshaft timing gear fixed to the upper part of the camshaft and located above the engine block, a timing belt extending between and around the crankshaft timing gear and the camshaft timing gear, and a one-piece cover mounted on the engine block and enclosing the flywheel, the recoil starter, the camshaft timing gear, and the timing belt, and a cowling enclosing the engine block assembly.

Abstract: Disclosed herein is an outboard motor comprising means adapted for connection to a boat transom and including a swivel bracket having a kingpin bore, a propulsion unit comprising a power head including an internal combustion engine, a lower unit fixed to the power head and including a drive shaft having a vertically extending axis, being driven by the engine, and adapted to drive a propeller, a forwardly facing surface located on the propulsion unit in forwardly spaced relation to the drive shaft axis, a kingpin extending in the kingpin bore and including an upper end, a steering arm connected to the upper end of the kingpin for rotation in common with the kingpin, and vibration isolation means connecting the steering arm and the propulsion unit and located above the upper end of the kingpin and forwardly of the forwardly facing surface on the propulsion unit.

Abstract: Disclosed herein is a four stroke engine breather comprising a camcase cover including an outer surface partially defining a camcase cover chamber including first and second sub-chambers communicating with each other and a sump sub-chamber, an inlet passage through the camcase cover and communicating with the camcase cover chamber for conveying an air/oil mist from the camcase to the camcase cover chamber, a restricted oil drainage passage through the camcase cover and communicating with the sump sub-chamber for conveying oil from the sump sub-chamber to the camcase, an oil drainage aperture in the camcase cover and communicating between the sump sub-chamber and one of the first and second sub-chambers, a plate engaging the camcase cover to further define the camcase cover chamber and including an aperture communicating through the plate with one of the first and second sub-chamber in the camcase cover chamber, a reed valve fixed relative to the plate and including a valve portion movable between positions cl

Abstract: Disclosed herein is a drive shaft housing including outer side walls extending in spaced relation to each other, a forwardly located wall extending between the outer side walls, a rearwardly located wall spaced rearwardly from the forwardly located wall and extending between the outer side walls, a bottom wall extending between the outer side walls and between the forwardly and rearwardly located walls, which outer side walls, which forwardly and rearwardly located walls, and which bottom wall define an oil sump, a coolant passage extending vertically in one of the outer side walls, the forwardly located wall, and the rearwardly located wall, being adapted, adjacent the upper end thereof, for connection to a source of coolant, and terminating, at the lower end thereof, in a port located in the bottom wall, and a deflector fixed to the bottom wall and defining with the bottom wall a conduit extending along the bottom wall and having one end communicating with the coolant passage and a second end having an elon

Abstract: Disclosed herein is an outboard motor comprising a cylinder block having a horizontally extending lower mounting surface and a rearwardly located vertically extending cylinder head mounting surface, a cylinder head fixed to the cylinder head mounting surface, extending rearwardly from the cylinder block, and including a bottom wall portion having therein a rocker arm support shaft aperture and a camshaft aperture, a camshaft supported vertically and horizontally in the cylinder head about an axis located rearwardly of the cylinder head mounting surface, a rocker arm support shaft supported vertically and horizontally in the cylinder head about an axis located rearwardly of the cylinder head mounting surface, and a lower unit including a driveshaft housing supporting a propeller fixed to the cylinder block lower mounting surface and including an upper rearward profile located forwardly of the camshaft aperture and the rocker arm support shaft aperture and extending so as to enable, when the housing is fixed to

Abstract: A cam shaft assembly comprising an elongated shaft including an axis, an end, and an axial bore extending from the end of the shaft and having an end portion adjacent the end of the shaft, a cam located on the shaft and including a cam surface having an eccentric lobe surface and a partially cylindrical surface extending at a uniform radius from the axis, a slot extending axially in the shaft and radially between the axial bore and the cylindrical surface and including a first part in the cam and a second part spaced axially from the first part, an actuating shaft extending in the axial bore, a pin extending radially from the actuating shaft and into the slot for a radial distance greater than the radius of the cylindrical surface, a spring biasing the pin toward the first part of the slot, and a piston subject to fluid pressure, located in the end portion of the axial bore, and engagable with the actuating shaft to axially displace the actuating shaft against the action of the spring so as to locate the pin