Idle exhaust system for outboard motor

摘要

An outboard motor includes a housing unit and an engine disposed above the housing unit. The engine defines a first exhaust passage to discharge exhaust gases from the engine and a lubricant passage through which lubricant flows. A lubricant reservoir member is disposed below the engine within the housing unit to define a lubricant reservoir therein. The lubricant passage communicates with the lubricant reservoir. A second exhaust passage, which can be defined on an outer surface of the lubricant reservoir member, extends along the height of the lubricant reservoir. The housing unit defines third and fourth exhaust passages. The third exhaust passage is arranged between the first and second exhaust passages. The fourth exhaust passage is arranged downstream of the second exhaust passage. The housing unit defines an exhaust discharge port at an end of the fourth exhaust passage. The exhaust discharge port communicates with the atmosphere.