Abstract: An apparatus and method for silencing an engine are disclosed. A silencer is disposed about a motor and is molded to substantially match at least one of a contour of the cover and a contour of the motor to silence noise transmitted from the motor.

Abstract: An apparatus and method for conditioning an internal combustion engine for storage is disclosed. The engine includes an ECU that is programmed to initiate an auto-fogging procedure. The auto-fogging procedure automatically introduces increased amounts of lubricating oil into the engine thereby coating the cylinders and some of the internal components of the engine with a protective film of oil for storage.

Abstract: A cylinder block for an internal combustion engine includes a mounting surface having therein a crankcase cavity and a pair of cylinders respectively extending from the cavity in acute angular relation to each other and each including a cylinder wall. The cylinder walls include outer ends having cylinder head mounting surfaces, mixture transfer ports, mixture supply ports, gas discharge ports and a main exhaust gas discharge passage. A passage communicates between the exhaust gas discharge ports and with the main exhaust gas discharge passage. Mixture supply passages extend between the mounting surface and the cylinder head mounting surfaces and include reed valves. Branch passages communicate between the transfer ports in the cylinder walls and the mixture supply passages at respective locations between the cylinder head mounting surfaces and the reed valves. Auxiliary supply passages extend from the mounting surface and communicate with the mixture supply ports in the cylinder walls.

Abstract: Disclosed herein is a four-stroke internal combustion engine comprising a common crankcase, a crankshaft extending in the crankcase, first and second cylinders respectively extending from the common crankcase in acute angular relation to each other and respectively including first and second cylinder walls respectively including first and second exhaust gas discharge ports, a passage connecting the first and second exhaust gas discharge ports, first and second pistons respectively located in the first and second cylinders and respectively connected to the crankshaft for reciprocating movement toward and away from the crankshaft and between top dead center and bottom dead center positions, first and second cylinder heads respectively connected to the first and second cylinders, respectively partially defining first and second combustion chambers, and respectively including first and second mixture inlet passages respectively communicating with the first and second combustion chambers, first and second exhaust

Abstract: Disclosed herein is an internal combustion engine comprising a crankcase assembly including a crankcase member including a crankcase cover mounting surface, and a cylinder assembly mounting surface including therein an opening, and a cylinder block fabricately separately from the crankcase assembly and including a crankcase member surface fixed to the cylinder assembly mounting surface, and a cylinder extending from the crankcase member mounting surface and communicating with the opening in the cylinder assembly mounting surface.

Abstract: Disclosed herein is a marine propulsion device comprising an internal combustion engine including an engine block having therein a water jacket and having a lower face which includes therein a recess, a drive shaft housing connected to the lower face of the engine block, a propeller shaft rotatably supported by the drive shaft housing and adapted to support a propeller, a drive shaft extending through the drive shaft housing and including an upper end driven by the engine and a lower end drivingly connected to the propeller shaft, an exhaust housing located at least partially within the drive shaft housing and including an upper face mating with the lower face of the engine block and including therein a recess located in opposed relation to the recess in the lower face, a water passage defined by the recess in the lower face of the engine block and by the recess in the upper face of the exhaust housing, which water passage has an inlet end and an outlet end spaced horizontally from the inlet end and communica

Abstract: A marine propulsion device comprising an upper housing which has a lower surface and which is adapted to be mounted on the transom of a boat for pivotal movement relative thereto, a lower housing having an upper surface mating with the lower surface, a propeller shaft rotatably supported by the lower housing, and an arrangement for reducing fretting between the lower surface and the upper surface.

Abstract: Disclosed herein is an engine comprising a closed deck cylinder block including a cylinder bore having an outer end, a counter bore at the outer end of the cylinder bore, and an outer wall including an outer cylinder head mounting surface extending from the counter bore, a coolant jacket located in spaced surrounding relation to the cylinder bore and being defined in part by the outer wall, and a passage located in the outer wall and communicating between the cylinder head mounting surface and the coolant jacket, a cylinder liner received in the cylinder bore and defining, with the counter bore, a U-shaped annular groove in the cylinder head mounting surface, a cylinder head including a cylinder block mounting surface engaged with the cylinder head mounting surface of the cylinder block, an interior coolant jacket, and a passage extending from the coolant jacket in the cylinder head to the cylinder block mounting surface of the cylinder head and communicating with the passage in the cylinder block.

Abstract: Disclosed herein is an engine comprising a closed deck cylinder block including a cylinder bore having an outer end, a counter bore at the outer end of the cylinder bore, and an outer wall including an outer cylinder head mounting surface extending from the counter bore. In addition, the engine includes a cylinder liner received in the cylinder bore and defining, with the counter bore, an annular groove in the cylinder head mounting surface, and a cylinder head including a cylinder block mounting surface engaged with said cylinder head mounting surface of said cylinder block. Still further in addition, the engine includes a seal member located in the annular groove and engaged with the cylinder block and the cylinder head, and a plurality of fasteners extending between and tightly securing together the cylinder block and the cylinder head.

Abstract: An internal combustion engine comprising an engine block defining a cylinder bore and including an exhaust passage communicating with the cylinder bore, a cylinder liner which is housed in the cylinder bore and which includes an exhaust port communicating with the engine block exhaust passage, and structure on one of the engine block and the cylinder liner for permitting one of the engine block and the cylinder liner to expand adjacent the exhaust port.

Abstract: Disclosed herein is a marine propulsion device comprising an internal combustion engine including an engine block, a drive shaft housing, a propeller shaft rotatably supported by the drive shaft housing and adapted to support a propeller, a drive shaft extending through the drive shaft housing and including an upper end driven by the engine and a lower end drivingly connected to the propeller shaft, and a resilent mount connected solely to the engine block and adapted to be supported by a kingpin.

Abstract: A marine propulsion device comprising a propulsion unit adapted to be mounted on the transom of a boat for pivotal movement relative thereto about a generally vertical steering axis, the propulsion unit comprising a lower unit rotatably supporting a propeller shaft adapted to support a propeller, a conduit for providing a discharge of fluid from the propulsion unit, and a nozzle for selectively varying the direction, relative to the lower unit, of the discharge.

Abstract: An internal combustion engine comprising an engine block including an outer surface, structure including the engine block and a member connected to the surface of the engine block for defining a substantially closed chamber, a crankshaft extending from the engine block and into the chamber, a flywheel located in the chamber, connected to the crankshaft, and including thereon a starter gear, a stator located in the chamber and fixed to the engine block, a magnet or magnets located in the chamber and fixed to the flywheel for rotation therewith in a path adjacent to the stator, a finned coolant jacket located in the chamber and adapted to be connected to a source of coolant exterior to the chamber, structure on the flywheel for creating air flow in a path extending between the stator and the coolant jacket, a starter motor mounted on the block exteriorly of the chamber and including an output shaft extending into the chamber through the member, and a mechanism locatd in the chamber, drivingly connected to the o

Abstract: Disclosed herein is a marine propulsion device comprising a propulsion unit including a rotatably supported propeller, and an engine drivingly connected to said propeller and comprising an engine block, a spark timing control mechanism rotatably supported by the engine block for spark advancing and retarding movement between a minimum spark advance position and a maximum spark advance position, a throttle supported by the engine block for movement between idle and full speed positions, a control lever supported by the engine block for movement in opposite directions and adapted to be connected to an operator controlled actuating member, and a control linkage connected to the lever and to the throttle and to the spark timing control mechanism, and operative in response to control lever movement, for displacing the throttle from the idle position to a first intermediate position between the idle and the full speed positions without displacing the spark advance position, for displacing the throttle from the firs

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: Disclosed herein is an engine comprising a closed deck cylinder block including a cylinder bore having an outer end, a counter bore at the outer end of the cylinder bore, and cylinder liner received in the cylinder bore and defining, with the counter bore, a U-shaped annular groove in the cylinder head mounting surface. A seal is located in the groove to provide a seal between the cylinder head and cylinder block. There is a pressure relief valve to control flow to the coolant jacket in the cylinder heat from the coolant jacket in the cylinder block. At low speeds the valve is closed so as to not overly cool the cylinder head.

Abstract: An internal combustion engine comprising an engine block including a cylinder and a combustion air passage for supplying combustion air to the cylinder, an air silencer communicating with the combustion air passage, and an elastic connector for securing the air silencer to the engine block.

Abstract: An outboard motor comprising a lower unit, a propeller shaft rotatably supported by the lower unit and adapted to support a propeller, and an internal combustion engine supported by the lower unit and drivingly connected to the propeller shaft, the internal combustion engine including an engine block defining at least one cylinder and having a lifting hook integrally formed on the engine block.

Abstract: A two-stroke internal combustion engine comprising an engine block including a first exterior surface portion, a second exterior surface portion spaced from the first portion and having therein a crankcase-defining cavity, and a combustion air passage extending from the first exterior surface portion to the crankcase-defining cavity, an intake manifold fixed to the first exterior surface portion of the engine block and including therein a combustion air passage in alignment with the combustion air passage in the engine block, and a carburetor fixed to the intake manifold and having therein a combustion air passage in alignment with the intake manifold combustion air passage.

Abstract: Disclosed herein is a marine propulsion device comrising a propulsion unit including a cavity defined in part by a wall, an opening communicating with the cavity, a rubber mount insertable into the cavity through the opening, and an expandible wedge insertable through the opening and into the cavity, securable to the propulsion unit, and engageable with the rubber mount for fixedly securing the rubber mount to the propulsion unit and between the insertable expandible wedge and the wall of the cavity.