Patent ID: 7056170

Claim:
A water-cooled vertical engine comprising: a crankshaft disposed substantially vertically; a connecting rod; a piston connected via the connecting rod to the crankshaft; a cylinder housing the piston in a reciprocating manner; a cylinder block including the cylinder; a cylinder head connected to the cylinder block; a combustion chamber formed by the cylinder head in cooperation with the cylinder and the piston; a cylinder block cooling water jacket formed in the cylinder block; a cylinder head cooling water jacket formed in the cylinder head; and a cooling water pump for supplying cooling water to the two water jackets; wherein the cylinder block cooling water jacket and the cylinder head cooling water jacket are substantially independent of each other, and a pair of left and right cooling water passages, branching from a cooling water passage for supplying cooling water from the cooling water pump to the cylinder block cooling water jacket, is made to communicate with the cylinder head cooling water jacket via gasket faces of the cylinder block and the cylinder head.