Cooling water circulating structure in internal combustion engine

摘要

A cooling water circulating structure in an internal combustion engine is to be provided wherein cooling water can flow to every corner through a water jacket in a cylinder block and a water jacket in a cylinder head without being localized and thereby can cool the whole efficiently and which permits an easy layout of the water piping. A cooling water circulating structure in a multi-cylinder type internal combustion engine wherein a cooling water inlet and a cooling water outlet are formed side by side respectively in a side face of a cylinder block and a side face of a cylinder head both on the same side of the internal combustion engine close to a water pump, and a cylinder block-side water jacket and a cylinder head-side water jacket are brought into communication with each other through communication paths and are formed on the side opposite to the side close to the water pump, thereby allowing cooling water to circulate.