| 摘要 |
An internal combustion engine for a personal watercraft in which cooling water in an oil cooler housing is naturally discharged when the personal watercraft is pulled up on land. An oil cooler is disposed within an oil cooler housing on an upper front side of the engine. The oil cooler housing enables cooling water taken from the cooling water intake port at the positive pressure side of the jet propulsion pump to flow about the oil cooler thereby cooling lubricating oil. A water pipe connects the pump to a cooling water inflow opening at a lower end of the oil cooler housing. Cooling water discharged from an upper end of the cooler housing is directed to the engine. The oil cooler housing resides above the water pipe and the crankshaft of the engine, and the pump intake lies below the crankshaft permitting free discharge of cooling water therefrom.
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