Engine cooling structure

An engine cooling structure for cooling an engine body including a plurality of cylinders by using a coolant, the engine cooling structure comprising:

• a cylinder block including:
• a block inner peripheral wall defining the plurality of cylinders;
• and a block outer peripheral wall surrounding the block inner peripheral wall to define a water jacket through which the coolant circulates between the block outer peripheral wall and the block inner peripheral wall;
• a spacer housed in the water jacket;
• and
• a cooler provided outside the engine body and including an EGR (exhaust gas recirculation) cooler that cools an EGR gas that is an exhaust gas recirculated to an intake air to be introduced into the engine body out of an exhaust gas discharged from the engine body, and an oil cooler that cools a lubricant supplied to the engine body,
• wherein the block outer peripheral wall includes:
• a coolant inlet configured to introduce the coolant into the water jacket;
• and a coolant exit configured to lead out the coolant from the water jacket to the cooler,
• the block inner peripheral wall includes an inter-bore part positioned between adjacent cylinders of the plurality of cylinders,
• the spacer includes:
• a peripheral wall surrounding the block inner peripheral wall;
• and a dividing wall protruding from the peripheral wall to divide the water jacket into an upper passage and a lower passage below the upper passage,
• the coolant inlet is provided at a position to introduce the coolant into the upper passage,
• the upper passage allows the coolant introduced from the coolant inlet to come in direct contact with the inter-bore part,
• the coolant exit is provided at a position to lead out the coolant in the lower passage to the cooler,
• the cooler cools a predetermined cooling object by the coolant led out from the coolant exit,
• the coolant exit includes a first exit formed in an exhaust side wall of the block outer peripheral wall, and a second exit formed in an intake side wall of the block outer peripheral wall,
• the first exit leads out the coolant in the lower passage to the EGR cooler, and
• the second exit leads out the coolant in the lower passage to the oil cooler.