Outboard motor with selectively operable drainage system

An outboard motor comprising a cylinder, a crankcase extending from said cylinder, a transfer passage extending between said cylinder and said crankcase, and a drainage outlet located in said crankcase and including valve means selectively operable for closing said drainage outlet and for communicating said drainage outlet with the atmosphere for drainage of fluid from the motor.

An outboard motor comprising a fuel supply system including a carburetor having a float bowl including a valved drainage outlet operable between a closed position and an open position communicating with the atmosphere.

An outboard motor comprising a fuel supply system including a carburetor having an air-fuel induction passage communicating through a manifold with the interior of an engine block, said manifold including a valved drainage outlet operable between a closed position and an open position communicating with the atmosphere.

An outboard motor comprising a fuel supply system including a carburetor having a float bowl including, at the lowermost part thereof, a valved drainage outlet operable between a closed position and an open position communicating with the atmosphere, said carburetor also including an air-fuel induction passage communicating through a manifold with the interior of an engine block, said manifold including, at the lowermost part thereof, a valved drainage outlet operable between a closed position and an open position communicating with the atmosphere, and pump means for pumping fuel from a source to said carburetor bowl.

An outboard motor comprising a cylinder, a crankcase extending from said cylinder and including, at the lowermost part thereof, a drainage outlet including valve means selectively operable for closing said crankcase drainage outlet and for communicating said crankcase drainage outlet with the atmosphere for drainage of fluid from said crankcase, a transfer passage communicable between said cylinder and said crankcase, an exhaust port communicable between said cylinder and the atmosphere, a piston reciprocably movable within and relative to said cylinder to open and close said exhaust port and to open and close said transfer passage, and a fuel supply system including a carburetor having a float bowl including, at the lowermost part thereof, a valved drainage outlet operable between a closed position and an open position communicating with the atmosphere, said carburetor also including an air-fuel induction passage, a manifold communicating between said induction passage and said crankcase and including, at the lowermost part thereof, a valved drainage outlet operable between a closed position and an open position communicating with the atmosphere, and pump means for pumping fuel from a source to said carburetor bowl.

A method of purging water from an outboard motor comprising a cylinder, a crankcase extending from the cylinder, a transfer passage communicable between the cylinder and the crankcase, an exhaust port communicable between the cylinder and the atmosphere, a piston reciprocably movable relative to the cylinder to open and close the exhaust port and to open and close the transfer passage, and a drainage outlet located in the crankcase and including valve means selectively operable for closing the drainage outlet and for communicating the drainage outlet with the atmosphere for drainage of fluid from the motor, said method comprising the steps of opening the drainage outlet and causing reciprocation of the piston to expel water from the crankcase through the drainage outlet and to open the exhaust port so as to communicate the cylinder with the atmosphere through the exhaust port and thereby to permit drainage of fluid from the cylinder through the transfer passage to the crankcase and from the crankcase through the drainage outlet.

A method of purging water from a fuel supply system including a carburetor having a float bowl with a valved drainage outlet operable between a closed position and an open position communicating with the atmosphere, said method comprising the steps of opening the drainage outlet.

A method of purging water from a fuel supply system including a carburetor having an air-fuel induction passage communicating through a manifold with the interior of an engine block, which manifold includes a valved drainage outlet operable between a closed position and an open position communicating with the atmosphere, said method comprising the steps of opening the manifold drainage outlet.

A method of purging water from a fuel supply system comprising a carburetor having a float bowl including, at the lowermost part thereof, a valved drainage outlet operable between a closed position and an open position communicating with the atmosphere, which carburetor also includes an air-fuel induction passage communicating through a manifold with the interior of an engine block, which manifold includes, at the lowermost part thereof, a valved drainage outlet, and pump means for pumping fuel from a source to the carburetor bowl, said method comprising the steps of opening the manifold drainage outlet, opening the bowl drainage outlet, and operating the pumping means to purge water from the bowl through the bowl drainage outlet to the atmosphere.

An outboard motor comprising a cylinder, and air and/or fuel supply means communicable with said cylinder and having a drainage outlet, an overboard drain, and valve and conduit means selectively operable for communicating said drainage outlet with said overboard drain and for closing said drainage outlet.

An outboard motor comprising a cylinder, a crankcase extending from said cylinder and including a drains outlet, a transfer passage extending between said cylinder and said crankcase, a drains return inlet in one of said cylinder, said crankcase, and said transfer passage, an overboard drain, and valve and conduit means selectively operable for communicating said crankcase drains outlet with said overboard drain and for communicating said crankcase drains outlet with said drains return inlet.

An outboard motor comprising a cylinder, a crankcase extending from said cylinder and including a drains outlet, a transfer passage extending between said cylinder and said crankcase, a drains return inlet in one of said cylinder, said crankcase, and said transfer passage, a carburetor communicable with said cylinder and having a drainage outlet, an overboard drain, and valve and conduit means selectively operable for communicating said overboard drain with each of said crankcase drains outlet and said carburetor drainage outlet, for communicating said drains return inlet with said crankcase drains outlet, and for closing said fuel drainage outlet.

An outboard motor comprising a cylinder, a crankcase extending from said cylinder and including an upper portion having a bearing and a lower portion having a drainage outlet, a transfer passage extending between said cylinder and said crankcase, a drains return inlet in one of said cylinder and said transfer passage, a fuel supply system including an inlet manifold communicable with said cylinder and having a drains outlet and a carburetor communicating with said inlet manifold and having a drainage outlet, an overboard drain, and valve and conduit means selectively operable for communicating said overboard drain with each of said manifold drains outlet, said crankcase drains outlet, and said carburetor drainage outlet, for communicating said crankcase bearing and said drains return inlet with said manifold drains outlet and said crankcase drains outlet, and for closing said carburetor drainage outlet.