EXHAUST PIPE STRUCTURE OF OUTBOARD MOTOR

摘要

PURPOSE: To prevent the entry of water from a breathing hole of an exhaust pipe to be opened in an exhaust expansion chamber into an engine through the inside of the exhaust pipe. CONSTITUTION: An exhaust pipe 26 to lead the exhaust from an engine to an exhaust expansion chamber 35 in an extension case is connected to a projecting part 212 of an oil pan 21 fitted to the lower surface of a mount case 4 on which the engine is supported. A breathing hole 261 formed on the exhaust pipe 26 is covered by a blocking plate at the outside, and no water enters the exhaust pipe 26 from the breathing hole 261 . A cooling water ejecting hole 331 formed in a cooling water feed pipe 33 to lead the cooling water from a cooling water pump to the engine is also provided at the position not opposite to the breathing hole 261 , the cooling water nor enters the exhaust pipe 26 even when the cooling water is ejected from the cooling water ejecting hole 331 to the exhaust pipe 26 so as to cool the exhaust pipe 26.