| 摘要 |
PROBLEM TO BE SOLVED: To prevent a local bending part 22 of piping extending from a radiator 4 to an engine body 1 from becoming an obstacle against air bleeding when pouring water. SOLUTION: A cooling water system consists of the engine body 1, the radiator 4, an upper part cooling water passage 12, and a lower part cooling water passage 10. Water is poured through a water filling port 6 in an upper part of the radiator 4 when pouring water, and cooling water flows into the engine body 1 through the upper part cooling water passage 12. The upper part cooling water passage 12 is provided with the bending part 22 bent downward to avoid the interference with other parts, and air bleeding pipings 31 are arranged in parallel to connect its both side parts mutually. Even if cooling water is collected in the bending part 22 when pouring water, it is possible to bleed air from the engine body 1 side through the air bleeding piping 31 to avoid remaining of air.
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