Plastic air intake silencer box for marine engine

A marine propulsion unit comprising an internal combustion engine having fuel delivery structure with a horizontal air intake throat, an air box mounted to said throat for directing air thereto and for silencing engine noise emitted back through said throat, said air box comprising a two piece molded plastic member having first and second housing sections sealed to each other with a fuel impervious seal along a peripheral seam lying in a vertical plane, said first and second housing sections being mounted to each other solely by said seal along said peripheral seam, without screws, fasteners, and the like, to prevent fuel leaks.

A marine propulsion unit comprising an internal combustion engine having fuel delivery structure with an air intake throat, an air box mounted to said throat for directing air thereto and for silencing engine noise emitted back through said throat, said air box comprising a multi-piece molded plastic member including a base section and a cover section assembled and sealed to each other by a seal along a peripheral seam and forming a plenum chamber, said base section and said cover section being preassembled to each other prior to mounting to said throat, said base section having an aperture therethrough mounted over said throat, and comprising attachment means mounting said base section to said throat, and comprising a removeable plug in said cover section which upon removal allows access to said base section through said cover section to permit mounting of said base section to said throat by said attachment means, followed by replacement of said plug.

A marine propulsion unit comprising an internal combustion engine having a carburetor with an air intake throat and a fuel adjustment screw adjacent said throat, an air box mounted to said throat for directing air thereto and for silencing engine noise emitted back through said throat, said air box comprising a multi-piece molded plastic member having a base section and a cover section preassembled and sealed to each other prior to mounting to said carburetor throat, means mounting said base section to said carburetor throat, an aperture in said base section over said adjusting screw, an aperture in said cover section, a removeable plug in said aperture in said cover section permitting access to said adjusting screw through said aperture in said cover section and said aperture in said base section upon removal of said plug, such that said adjusting screw may be adjusted with said air box mounted in place on said carburetor throat, to facilitate more accurate adjustment of said carburetor by enabling adjustment under actual operating conditions with said air box mounted in place.