Abstract: Disclosed herein is an outboard motor comprising a cylinder block including a lower horizontal drive shaft housing mounting surface, and a cylinder head mounting surface extending upwardly from the drive shaft housing mounting surface, a drive shaft housing including a peripheral outer surface including an upper end, a cylinder block mounting surface at the upper end, and a portion extending rearwardly from the cylinder block mounting surface and having therein a vertically open bore located forwardly of the outer surface, and a cylinder head comprising a cylinder block mounting surface fixed to the cylinder head mounting surface and including vertically spaced first and second recesses adapted to respectively form portions of first and second combustion chambers and respectively including first and second exhaust ports, a bottom surface extending transversely rearwardly from the cylinder block mounting surface of the cylinder head, a projection extending downwardly from the bottom surface and into the bore,

Abstract: Disclosed herein is a marine propulsion device comprising a propulsion unit assembly having forwardly located laterally spaced portions respectively including laterally aligned outwardly opening sockets and laterally aligned horizontally extending apertures communicating with the sockets, a king pin assembly including a portion located between the laterally extending portions and including a laterally extending bore aligned with the apertures, rubber mount assemblies respectively engaged in the sockets and having respective bores in alignment with the bore in the king pin assembly, a laterally extending bolt projecting through the bores and through the apertures in spaced relation thereto and including a head engaging one of the rubber mount assemblies, and a nut threaded on the bolt and engaging the other of the rubber mount assemblies.

Abstract: Disclosed herein is an outboard motor comprising a propulsion unit including a lower unit having port and starboard sides and comprising a drive shaft housing having an upper end, a power head including an engine fixedly attached to said upper end of said drive shaft housing, and an engine cover assembly comprising a starboard lower cover member extending downwardly to said lower end of said drive shaft housing and including an inwardly open recess, a port lower cover member extending downwardly to said lower end of said drive shaft housing and including an inwardly open recess, and means connecting together said port and starboard cover members independently of said lower unit and in surrounding covering relation to said drive shaft housing, and means resiliently supporting said lower cover members on said lower unit and including rubber mounts respectively extending from said port and starboard sides of said lower unit and into said inwardly open recesses of said lower cover members.

Abstract: A stern drive unit comprising a gimbal housing which is adapted to be mounted on the transom of a boat and which has therein an exhaust-water passage including a forwardly opening inlet, a rearwardly opening outlet, an exhaust conducting portion, a water conducting portion, and a water outlet communicating with the water conducting portion.

Abstract: A marine installation comprising a valve and cylinder apparatus including a housing having therein a spool bore extending along an axis, a second bore extending along a second axis parallel to and spaced from the spool bore axis, and a cylinder bore extending along an axis parallel to the spool bore axis, a spool slidably housed within the spool bore, a tubular member slidably housed within the second bore, and a link for moving the spool along the spool bore axis in response to movement of the tubular member along the second axis, a piston slidably housed within the cylinder bore, a piston rod having a first end fixedly connected to the piston, and a second end connected to the propulsion unit for causing pivotal movement of the propulsion unit about its steering axis in response to axial movement of the piston rod, and a cable assembly including a sheath fixedly connected to the tubular member for movement therewith, and an inner core extending through the tubular member and fixedly connected to the second

Abstract: A stern drive unit comprising a gimbal ring adapted to be mounted on the transom of a boat for pivotal movement relative thereto about a generally vertical steering axis, the gimbal ring including a rearward surface, and a lateral support portion extending rearwardly from the rearward surface, and a housing mounted on the gimbal ring for pivotal movement relative thereto about a generally horizontal tilt axis, the housing including a forward surface, and a lateral support portion extending forwardly from the forward surface and adjacent the gimbal ring lateral support portion.

Abstract: A marine propulsion device comprising a pivot housing including an opening, and a lip extending inwardly around the opening, a flexible bellows having an end complementary with and communicating with the opening in the pivot housing, the end of the bellows including a flange engaged with the lip, a propulsion unit removably connected to the pivot housing and including a portion engageable with the end of the bellows for compressing and securing the flange against the lip on the pivot housing so that the flange sealingly engages the pivot housing when the propulsion unit is connected to the pivot housing.

Abstract: A marine propulsion device comprising a pivot housing adapted to be mounted on a boat transom for pivotal movement relative to the boat transom about a generally vertical steering axis, and for pivotal movement relative to the boat transom about a generally horizontal tilt axis, a propulsion unit including a reversible transmission and being removably connected to the pivot housing for pivotal movement with the pivot housing, and a mechanism extending between the pivot housing and the propulsion unit for actuating the transmission from the pivot housing, the mechanism being disengaged incident to disconnection of the propulsion unit from the pivot housing, and being engaged incident to connection of the propulsion unit to the pivot housing.

Abstract: Disclosed herein is a marine propulsion device comprising a lower unit including a gearcase, a driveshaft having an end extending into the gearcase, a pinion mounted on the end of the driveshaft, a propeller shaft bearing housing located within the gearcase having a forward end adjacent the pinion, a propeller shaft rotatably mounted in the propeller shaft bearing housing and having a rear end portion and a portion forwardly of the rear end portion, a propeller mounted on the rear end of the propeller shaft, a bevel gear adjacent the forward end of the propeller shaft bearing housing and engaging the pinion, the bevel gear including an annular forwardly facing thrust transferring surface, and an annular thrust transferring element mounted on the propeller shaft bearing housing and engageable with the annular forwardly facing thrust transferring surface so as to transfer thrust forwardly from the bevel gear through the thrust transferring element and to the propeller shaft bearing housing.

Abstract: A marine propulsion device comprising a pivot housing adapted to be mounted on the transom of a boat for pivotal movement relative to the transom about a generally vertical steering axis, and about a generally horizontal tilt axis, the pivot housing including a rear end and an opening, a propulsion unit removably connected to the rear end of the pivot housing for pivotal movement with the pivot housing, a flexible bellows having an end communicating with the opening in the pivot housing, and a removable spring clamp for securing the end of the bellows to the pivot housing, the spring clamp functioning independently of the connection of the propulsion unit to the pivot housing and being removable from the rear end of the pivot housing when the propulsion unit is disconnected from the pivot housing.

Abstract: A marine propulsion device comprising an internal combustion engine, a propulsion unit adapted to be pivotally mounted on the transom of a boat for pivotal movement relative to the transom about a generally vertical steering axis, and about a generally horizontal tilt axis, the propulsion unit including a propeller operably connected to the engine, a pump for pumping water from the exterior of the propulsion unit to the engine, and a conduit extending from the pump to the engine and having a low point below both the pump and the connection of the conduit to engine, and a drain for draining water from adjacent the low point of the conduit.

Abstract: A marine propulsion device comprising a gimbal housing adapted to be fixedly attached to the transom of a boat and including an end plate adapted to be generally aligned with the boat transom and having an opening, opposite sides, and a rear surface, the gimbal housing also including a first generally vertical side member extending rearwardly from one side of the end plate, and a second generally vertical side member extending rearwardly from the other side of the end plate, a gimbal ring pivotally connected to the gimbal housing for pivotal movement relative to the gimbal housing about a generally vertical steering axis, a propulsion unit pivotally connected to the gimbal ring for pivotal movement relative to the gimbal ring about a generally horizontal tilt axis, and for pivotal movement with the gimbal ring about the steering axis, a hydraulic cylinder/piston assembly connected between the gimbal ring and the propulsion unit for effecting pivotal movement of the propulsion unit relative to the gimbal ring,

Abstract: A marine propulsion device comprising a gimbal housing adapted to be fixedly attached to the rear of a boat transom, a gimbal ring, and structure accessible from rearward of the boat transom for removably connecting the gimbal ring to the gimbal housing so as to provide for pivotal movement of the gimbal ring relative to the gimbal housing about a generally vertical steering axis.

Abstract: A marine propulsion device comprising a mounting bracket adapted to be fixedly attached to the transom of a boat and having therein an opening, a propulsion unit pivotally connected to the mounting bracket for pivotal movement relative to the mounting bracket, a hydraulic cylinder/piston assembly connected between the mounting bracket and the propulsion unit for effecting pivotal movement of the propulsion unit relative to the mounting bracket, a manifold fixedly attached to the mounting bracket adjacent the opening, the manifold being adapted to be connected to a source of hydraulic fluid inside the boat, and a fluid line communicating between the manifold and the hydraulic cylinder/piston assembly for supplying hydraulic fluid to the cylinder/piston assembly.

Abstract: A marine propulsion device comprising a transom unit adapted to be mounted on a marine vehicle, a swivel support pivotally mounted on the transom unit for vertical tilting movement about a horizontal tilt axis, a lower unit pivotally steerable relative to the swivel support about a vertical steering axis, and a steering mechanism for pivoting the lower unit about the steering axis. The steering mechanism comprises a first pulley rotatably mounted on the transom unit, a steering arm for rotating the first pulley, and cables for connecting the first pulley to the lower unit so that the lower unit pivots in response to rotation of the first pulley. The steering mechanism also includes a second pulley and the lower unit is pivotally steerable relative to the swivel support by rotatably mounting the second pulley on the swivel support and by fixedly attaching the lower unit to the second pulley. The cables are connected to the lower unit by connecting the cables to the second pulley.

Abstract: The outboard motor includes a powerhead housing defining an engine compartment for an internal combustion engine and a vent assembly for ventilating the engine compartment to the atmosphere. The vent assembly includes a tubular member mounted in an aperture in the housing bottom wall and having an inlet port communicating with the interior of the engine compartment, an outlet communicating with the atmosphere and an interior wall defining a bulbous passage between the inlet and outlet ports. Under normal operating conditions, a buoyant ball valve movably disposed in the bulbous passage is held in an open position by gravity to afford free air flow into and out of the engine compartment. In the event the water rises to a level above the housing bottom wall, the ball valve floats on the water entering through the vent assembly outlet and sealingly engages a valve seating surface to prevent entry of water into the engine compartment.

Abstract: Shifting of a marine propulsion device transmission drivingly connecting a drive shaft to an internal combustion engine and including a rotatable member operable to shift the transmission between forward drive, reverse drive and neutral positions in response to rotation of a shift lever is assisted by an arrangement including a pin or element pivotally connected to a push-pull assembly operated by a main control and carried by the shift lever. The shift assistance arrangement includes a spring which retains the element in a normal position relative to the shift lever when shift resistance to movement of the transmission from an "in gear" to the neutral position is less than a predetermined level and permits displacement of the element relative to the shift lever from the normal position when the shift resistance is above that predetermined level. The shift assistance arrangement also includes a switch operable when actuated to selectively interrupt engine ignition.