Water cooled internal combustion engine having radiator

Abstract

[Problem] Simplifying a water circulation structure of a cylinder block and realizing a compact layout of piping connecting an engine body and a radiator. [Solution] A water-cooled internal combustion engine E is provided with an engine body including a cylinder block 20 and a cylinder head 21, and a radiator 52. The radiator 52 is disposed separated, in a prescribed direction, i.e. in a rightward direction, from the engine body. A chain chamber 44 which accommodates a transmission mechanism, including a chain, for a valve system is provided in end portions 20e and 21e, which are located rightwardly toward the radiator 52, of the cylinder block 20 and the cylinder head 21, respectively. A cooling water outlet portion 61 open to a cylinder head water jacket Jh is provided in the end portion 21e of the cylinder head 21, the cooling water outlet portion 61 being connected with an inlet pipe 57 for leading the cooling water having flowed out of a cylinder block water jacket into the cylinder head water jacket Jh to the radiator 52. The cooling water outlet portion 61 is disposed rightwardly closer to the radiator 52 than the chain chamber 44.