| 摘要 |
A four-cycle engine mounted on a small planing watercraft is disclosed, in which an oil tank is integrally formed with the side walls of a cylinder head, a cylinder block, a crank case, or an oil pan of the engine b ody.An oil receptacle is arranged on the bottom of the e ngine body and communicates with an internal space of the crank case. The engine body includes an oil passage for transporting the engine oil collected in the oil receptacle to the oil tank by means of a scavenging pump, and an oil passage for supplying the engine oil in the oil tank to the various parts of the eng ine body by means of a feed pump. The oil tank may be formed of a tank base portion integral with the side walls of the engine body and a tank cover. An oilmist separating fin may be arranged in the oil tank.
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