Abstract: A multiple cylinder internal combustion cylinder block having a cast exhaust manifold means integrally cast with the block is disclosed. The manifold means includes manifold port portions that communicate with the cylinder bores, and an expansion slot is provided in the manifold port portions adjacent the cylindrical bores to relieve stress that tends to distort the cylindrical bores of the block.

Abstract: A thermostat cover assembly for a external combustion motor of the type which has a thermostat control valve with a thermostatically actuated spring for controlling the flow of coolant through the cylinder bank of the motor to maintain a predetermined coolant temperature, the motor having an outer protective cowling. The thermostat cover includes at least one intake nipple having a first end and a second end. The nipple is configured for releasably accepting an intake hose. The thermostat cover further includes a mounting plate having a front side and a rear side. The mounting plate is configured to receive the intake nipple so that the nipple may be engaged to the plate in a plurality of specified orientations. The plate also has nipple fastening means for releasably securing the nipple to said plate.

Abstract: An outboard motor comprising a transom bracket which is adapted to be mounted on the transom of a boat and which includes first and second generally horizontally spaced apart portions, a tilt tube which extends through the transom bracket portions and along a generally horizontal tilt axis and which includes a first end portion extending outwardly of the first transom bracket portion and a second end portion extending outwardly of the second transom bracket portion, a swivel bracket mounted on the tilt tube for pivotal movement relative to the transom bracket about the tilt axis, a propulsion unit mounted on the swivel bracket for common movement therewith about the tilt axis and for pivotal movement relative thereto about a generally vertical steering axis, the propulsion unit including a propeller shaft adapted to support a propeller, and a steering arm adapted to be connected to a remote steering system, and structure on both of the tilt tube end portions for permitting the remote steering system to be alt

Abstract: A hydraulic assembly for use with a marine propulsion device including a bracket adapted to be mounted on a boat and a propulsion unit pivotally mounted on the bracket, the hydraulic assembly comprising a cylinder/piston assembly including one end adapted to be connected to the bracket, an opposite end adapted to be connected to the propulsion unit, a generally flat first mounting surface, and a passage communicating with the mounting surface, a reservoir having a wall which is formed by blow molding and which includes a tank portion defining a cavity adapted to contain hydraulic fluid, a mounting flange having thereon a generally flat second mounting surface and having therein an orifice, and a neck portion defining a passageway communicating between the cavity and the orifice, the passageway having a reduced cross-sectional area relative to the cavity and having an increased cross-sectional area relative to the orifice, a sealing element, and structure for mounting the reservoir on the cylinder/piston assem

Abstract: Disclosed herein is a marine propulsion device comprising a transom bracket adapted to be mounted on a boat transom and including an upper surface, a swivel bracket connected to the transom bracket for pivotal movement about a horizontal tilt axis, a holding member pivotally mounted on the swivel bracket for movement about a horizontal second axis between a park position, a low-tilt position, and a high-tilt position, which holding member includes a low-tilt abutment surface engageable with the upper surface of the transom bracket when the holding member is in the low-tilt position and extending perpendicularly to a radial plane extending through the second axis and at a first radial distance from the second axis, a high-tilt abutment surface engageable with the upper surface of the transom bracket when the holding member is in the high-tilt position, which high-tilt abutment surface extends perpendicularly to a radial plane through the second axis and at a second radial distance from the second axis greater

Abstract: Disclosed herein is a marine propulsion device comprising a transom bracket adapted to be mounted on a boat transom and including a pair of laterally spaced elements, a swivel bracket supported from the transom bracket for pivotal movement about a horizontal tilt axis and through a trim range and a tilt range extending upwardly from the trim range, which swivel bracket includes a portion which extends generally vertically when the swivel bracket is in the trim range and which includes an unbroken rearward surface extending between the transfer bracket elements and a projection extending forwardly therefrom, a roller supported by the projection for rotation about a horizontal axis parallel to the tilt axis, a hydraulic tilt and trim assembly comprising a tilt hydraulic cylinder/piston assembly comprising a tilt cylinder pivotally connected to the transom bracket and a tilt piston rod pivotally connected to the swivel bracket, and a trim hydraulic cylinder/piston assembly comprising a trim cylinder fixedly conn

Abstract: A marine propulsion device comprising a bracket structure adapted for connection to a boat transom and a propulsion unit connected to the bracket structure for pivotal movement about a generally vertical steering axis and for tilting movement about a generally horizontal tilt axis, which propulsion unit includes an internal combustion engine including an engine block having a cooling jacket, a lower unit supporting the engine block and including a propeller shaft drivingly connected to the engine, a cover removably supported by the propulsion unit in enclosing relation to the engine and including a portion having therein an opening, a conduit extending from the engine block and through the opening and including therein a bore communicating with the cooling jacket and having an outer end with an internal thread, and a plug removably and threadably received in the threaded outer end portion of the conduit.

Abstract: An apparatus for mounting an outboard motor on a boat transom, the apparatus comprising a transom bracket including an upper portion and a portion extending downwardly from the upper portion and having a surface adapted to engage the boat transom, means including a bolt member for releaseably clamping the downwardly extending portion to the boat transom, the bolt member including a portion extending outwardly from the surface of the downwardly extending portion, and a cover removeably fastened to the downwardly extending portion by screws to conceal the outwardly extending portion of the bolt member.

Abstract: A marine propulsion device comprising a transom bracket adapted to be affixedly mounted on the transom of a boat, a propulsion unit mounted on the transom bracket for pivotal movement relative thereto about a generally horizontal tilt axis, an extendable and contractable link connected between the transom bracket and the propulsion unit for pivoting the propulsion unit about the tilt axis, and a mechanism for stopping pivotal movement of the propulsion unit in response to the position of the link relative to the propulsion unit.

Abstract: Disclosed herein is a hydraulic circuit for a marine propulsion device, which circuit comprises a sump for hydraulic fluid, a reversible hydraulic pump, a first fluid conduit communicating between the sump and the pump and including a one way check valve permitting flow to the pump from the sump and preventing flow to the sump from the pump, a second fluid conduit communicating between the sump and the pump and including a one way check valve permitting flow to the pump from the sump and preventing flow to the sump from the pump, and a mechanism for opening one of the check valves in response to closure of the other of the check valves.

Abstract: An internal combustion engine comprising an engine member including an intake manifold mounting face having therein a series of openings, an intake manifold including an exterior surface comprising an engine mounting surface on the manifold mounting face, and a carburetor mounting surface in spaced relation to the engine mounting surface, and a like series of intake passages extending between the mounting surfaces, terminating at the engine mounting surface in respective openings respectively located in alignment with the openings in the manifold mounting face, and terminating at the carburetor mounting surface in respective openings, a drain re-circulation system for delivering drains accumulating in the intake passages to intake passages other than the intake passages in which the drains accumulated, a system for supplying primer fuel to the intake passages, and a system for supplying operating fuel to a like series of carburetors, and a like series of carburetors on the carburetor mounting surface, which c

Abstract: Disclosed herein is a marine propulsion device comprising a transom bracket adapted to be fixed to a boat transom and including a pattern of apertures spaced from an axis extending horizontally through the transom bracket when the transom bracket is boat mounted and including a forwardmost aperture, a thrust pin selectively insertable into any one of the apertures, a swivel bracket connected to the transom bracket for pivotal movement about the axis relative to the transom bracket and including a thrust transmitting surface for engagement with the thrust pin, and a cylinder/piston assembly having a first end connected to the transom bracket and a second end connected to the swivel bracket and extending forwardly of and below the pattern of apertures.

Abstract: Disclosed herein is an internal combustion engine comprising first and second cylinders and first and second cylinder head cavities respectively aligned and communicating with said first and second cylinders to respectively define compression ratios respectively associated with each of said first and second cylinders, and means for providing each of said first and second cylinders with respectively different compression ratios selected to maximized the power produced in each cylinder without knocking.

Abstract: A marine propulsion device comprising an engine including an exhaust outlet, a lower unit adapted to be mounted on a boat for pivotal movement relative thereto about a generally vertical steering axis, the lower unit including a rotatably mounted propeller driven by the engine, an annular chamber having a circumferential length and including a lower portion filled with water, an exhaust gas inlet located below the level of the water and communicating with the exhaust outlet, and an exhaust gas outlet located above the level of the water, and a seal for requiring exhaust gases flowing from the chamber inlet to the chamber outlet to flow around the chamber through a distance substantially greater than 50% of the circumferential length of the chamber.