| 摘要 |
To provide an internal combustion engine for a small-sized planing boat in which cooling water in the oil cooler storing part is naturally discharged when the small-sized planing boat is pulled up on a land. There is provided an internal combustion engine for a small-sized planing boat in which the oil cooler is stored at the oil cooler storing part for flowing cooling water taken from the cooling water intake port at the positive pressure side of the jet propulsion pump and flowing it out of the upper part, the cooling water passage is lowered from the lower part where the cooling water of the oil cooler storing part is flowed in and reaches to the cooling water intake por t at the positive pressure side of the jet propulsion pump.
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