Outboard motor exhaust system

Details Outboard motor exhaust system Outboard motor exhaust system

1998-03-30

1999-08-10

Avila, Stephen

Marine propulsion

Means for accomodating or moving engine fluids

Means for handling exhaust gas

B63H 2132

Patent

active

059349603

ABSTRACT:
A number of embodiments of four cycle outboard motors that have water cooled engines and an oil pan that is formed in the upper portion of the drive shaft housing. An exhaust pipe collects exhaust gases from an exhaust guide and delivers to a cavity that is formed in the oil pan by an interior wall thereof. The exhaust pipe does not terminate below the lower surface of the oil pan and several arrangements are disclosed for delivering idle exhaust gases to the area between the exterior of the exhaust pipe and the interior surface of the oil pan that defines the cavity. Various arrangements are disclosed for conveying idle exhaust gases to this area and discharging them to the atmosphere through and above the water exhaust gas discharge. These arrangements incorporate a system for precluding water from entering into the engine through its exhaust system including the idle discharge.

REFERENCES:
patent: 5232387 (1993-08-01), Sumigawa
patent: 5671779 (1997-09-01), Koishikawa et al.
patent: 5733157 (1998-03-01), Ozuzawa et al.

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