Patent ID: 6059619
Filing Date: 2000-05-09
Classification: B63H,F01N,F01P,F02B,F05C

Abstract:
An outboard motor that is comprised of a power head containing an internal combustion engine and a surrounding protective cowling, a drive shaft housing and lower unit depending from said power head and journaling a drive shaft driven by an engine crankshaft and a propulsion device for propelling an associated watercraft, said engine being comprised of a cylinder block member, a cylinder head and an oil pan forming member, said cylinder block member defining an upper part of a crankcase chamber in which said crankshaft is rotatably journaled and a cylinder bore closed at one end by said crankcase chamber and at the other end by said cylinder head, said cylinder head defining an exhaust passage that terminates in an exhaust port in an outer surface of said cylinder head, said oil pan forming member integrally forming an oil reservoir and the lower part of said crankcase chamber and an exhaust passage that receives at least some of the exhaust gasses from said cylinder head exhaust passage, said cylinder block member having an integral cooling jacket extending at least in part around said cylinder bore, and cooling passage means formed integrally in said oil pan forming member for delivering cooling water to said cylinder block member cooling jacket and discharging cooling water at least in part from said cylinder block member cooling jacket through said oil pan forming member in proximity to both said oil reservoir and said exhaust passage formed therein.