Idle exhaust gas relief arrangement for outboard motor

Details Idle exhaust gas relief arrangement for outboard motor Idle exhaust gas relief arrangement for outboard motor

1990-03-12

1991-08-20

Peters, Jr., Joseph F.

Marine propulsion

Means for accomodating or moving engine fluids

Means for handling exhaust gas

60324, B63H 2126

Patent

active

050410369

ABSTRACT:
Disclosed herein is an outboard motor comprising an internal combustion engine including a lower surface having therein an exhaust gas discharge port, a drive shaft housing having an upper end including an upper face fixed to the lower surface of the internal combustion engine, an outer surface extending downwardly from the upper face, an interior vertically extending main exhaust gas passage extending from the upper face and communicating with the exhaust gas discharge port, an idle exhaust gas relief passage recessed in the upper face and in spaced relation to the main exhaust gas passage, and closed by the lower surface of the internal combustion engine, and an idle exhaust gas outlet port located in the outer surface and communicating with the idle exhaust gas relief passage, and an idle exhaust gas relief tube communicating between the main exhaust gas passage and the idle exhaust gas relief passage and having a portion extending vertically within the main exhaust gas passage and terminating in spaced relation above the water level in the drive shaft housing when the drive shaft housing is located in a normal operating position and when the drive shaft housing is at rest relative to the water.

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