摘要 |
A water-cooled internal combustion engine E is provided with a cylinder block water jacket J<SUB>b</SUB>, a cylinder head water jacket J<SUB>h</SUB>, and an exhaust manifold passage 38 in which exhaust gas discharged from combustion chambers 26 through exhaust ports 28 collects. The exhaust manifold passage 38 is formed only in a cylinder head 21 . The exhaust gas that has collected in the exhaust manifold passage 38 is discharged through an exhaust outlet of the exhaust manifold passage 38 from a cylinder head 21 into an exhaust passage 39 formed in a cylinder block C. The exhaust manifold passage 38 is surrounded by the cylinder head water jacket J<SUB>h</SUB>, the cylinder block water jacket J<SUB>b </SUB>and a discharge water jacket 80 for carrying cooling water from the cylinder head water jacket J<SUB>h </SUB>and the cylinder block water jacket J<SUB>b </SUB>to the outside of the engine body. The engine E provided with the exhaust manifold passage 38 does not require any assembling work for sealing the exhaust manifold passage 38 and hence the cost of the combustion engine E can be reduced. A wall defining the exhaust manifold passage 38 can be efficiently cooled by the cooling water that flows through the water jackets.
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