Four-stroke engine for an outboard motor
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United States of America Patent
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Mar 17, 2009
Grant Date -
Oct 18, 2007
app pub date -
Dec 27, 2006
filing date -
Apr 14, 2006
priority date (Note) -
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Abstract
An engine for an outboard motor is provided that can include a crankcase having a crankcase chamber, a cam chamber, and an oil pan disposed below the crankcase. The engine can also include a crank chamber oil-return passage through which lubricating oil can be returned from the crank chamber to the oil pan. Further, the engine can include a cam chamber oil-return passage through which lubricating oil can be returned from the cam chamber to the oil pan. Finally, the engine can also include a gas passage to provide communication between the crank chamber, the cam chamber, and the oil pan in order to allow passage of blow-by gas without substantial interference with the movement of the lubricating oil.
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