| 摘要 |
PROBLEM TO BE SOLVED: To separate air generated by after-boiling from a high heat load instrument which is cooled by an engine cooling water without fail. SOLUTION: This engine cooling system is composed so as to return the cooling water from a radiator 16 to the same after being supplied to a cylinder head 11 and the water jackets 12 and 14 of a cylinder block 13 through a water pump 20, and is provided with an air release passage 36 which supplies air in the cooling water to the radiator 16 to separate. A joint 30 of a pipe 31 for an upstream side EGR cooler 32 which supplies the cooling water to the high heat load EGR cooler is installed in the water jacket 12 of the cylinder head 11, and another joint 35 of the air release passage 36 which communicates with the radiator 16 is installed near the joint 30. Thereby, air generated by after-boiling in the EGR cooler 32 is discharged through the air release passage 36 without fail.
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