Exhaust arrangement for outboard motor

Details Exhaust arrangement for outboard motor Exhaust arrangement for outboard motor

1998-07-22

2000-03-21

Sotelo, Jesus D.

Marine propulsion

Means for accomodating or moving engine fluids

Means for handling exhaust gas

123195P, 60321, B63H 100

Patent

active

060396180

ABSTRACT:
A number of the embodiments of exhaust systems and oil tank arrangements for four-cycle internal combustion engine powered outboard motors. In all of the embodiments, idle exhaust gases are discharged to the atmosphere through a path that extends above the oil tank. A cooling jacket is formed around an exhaust pipe that depends through a cavity in the oil tank and coolant from this cooling jacket is discharged to the exterior surface of the exhaust pipe so as to cool it. Cooling water from the engine and from the exhaust pipe cooling jacket is isolated from the idle exhaust gas discharge so as to ensure that this cooling water cannot enter the engine through the idle exhaust gas discharge path.

REFERENCES:
patent: 5487688 (1996-01-01), Sumigawa
patent: 5733157 (1998-03-01), Okuzawa et al.
patent: 5873755 (1999-02-01), Takahashi et al.

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