Patent ID: 7503318
Filing Date: 2009-03-17
Classification: F01M,F02B

Abstract:
1. An engine for an outboard motor, the engine comprising: a crank chamber; a cam chamber; a crankshaft having an axis extending substantially in the vertical direction: an oil pan defining an oil reservoir being disposed below and separated from the crank chamber; a crank chamber oil-return passage being in fluid communication with the crank chamber and the oil pan, the crank chamber oil-return passage being sized and configured to allow lubricating oil to be returned from the crank chamber to the oil pan; a cam chamber oil-return passage being in fluid communication with the cam chamber and the oil pan, the cam chamber oil-return passage being sized and configured to allow lubricating oil to be returned from the cam chamber to the oil pan; and a gas passage being in fluid communication with the crank chamber, the cam chamber, and the oil pan, the gas passage being sized and configured to allow passage of blow-by gas therethrough without interfering with the movement of the lubricating oil.