A FAST POST-IMMERSION RESTART SYSTEM FOR A MARINE PROPULSION UNIT

摘要

(57) Abstract: A marine propulsion unit comprises a cylinder (1), a combustion chamber (2) extending from one end of the com-bustion chamber, a spark plug (8) provided in the combustion chamber (2), and a piston (5) mounted for reciprocating movementwithin the cylinder (1). A first port (9) is provided in the combustion chamber (2), and this is selectively openable independent ofthe position of the piston (5) within the cylinder (1). If the propulsion unit should be immersed in water so that the cylinder becomesflooded, the cylinder canbepurged by opening theport(9) and movingthe piston (5) so as toexpelwaterthrough the port (9). Onceall water has been expelled, further movement of the piston causes gases in the cylinder to pass over the spark plug.