| 摘要 |
PURPOSE:To prevent deterioration of a catalyst by preventing sea water from entering an expansion chamber due to water leakage from a connecting part of a cooling water passage. CONSTITUTION:An expansion chamber communicating hole 11c, a return pipe communicating hole 11d and a cooling water passage are formed on an exhaust guide 11, and a high riser formed by bending like an inverted U-shape is connected to an expansion chamber formed on the lower side like a bag for storing a catalyst and to a downward extended return pipe through a hole 11c and a hole lid. Further, a cooling water passage is formed at least on the inner peripheral part of the high riser, an outflow hole 11 opened between the hole 11c and the hole 11d toe communicate with an inflow hole is located nearer to the hole 11d than the hole 11c on the joint face between the exhaust guide and the high riser, and a groove 11k recessed from the joint face is formed on the upper surface of the exhaust guide 11 between the hole 11g and the hole 11c. |
