| 摘要 |
PURPOSE: A water-cooled vertical engine, an outboard motor mounted with the water-cooled vertical engine, and the outboard motor are provided to properly execute temperature control of a cylinder head and a cylinder block, to minimize the number of coolant temperature sensors, and to surely detect overheating of the water-cooled vertical engine. CONSTITUTION: A water-cooled vertical engine comprises a crankshaft arranged in about a perpendicular direction; pistons connected to the crankshaft through connecting rods; cylinders receiving the pistons; a cylinder block(11) to which the cylinders are installed; cylinder heads(15) fastened to the cylinders, to constitute combustion chambers(20) by joining with the cylinders and the pistons; exhaust passages(24) in the cylinder heads; an exhaust passage unit venting exhaust gas to the outside from the combustion chambers; a cylinder block-cooling water jacket(JB) formed to the cylinder block around the combustion chambers; a cylinder head-cooling water jacket(JH) formed to the cylinder heads and formed independently of the cylinder block-cooling water jacket; exhaust passage-cooling water jackets(JM1,JM2,JM3) formed around the exhaust passage unit and formed independently of the cylinder head-cooling water jacket; and a coolant pump(46) supplying a coolant to each water jacket. The water-cooled vertical engine has a first cooling path supplying the coolant from the coolant pump to the cylinder block-cooling water jacket via the exhaust passage-cooling water jacket, and a second cooling path supplying the coolant from the coolant pump to the cylinder head-cooling water jacket. Thermostats(84,85) are each installed to the cylinder block-cooling water jacket and the cylinder head-cooling water jacket.
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