Abstract: A head-side jacket through which coolant flows is formed in a cylinder head. A main circulation path and a sub circulation path through which coolant fed from a coolant pump respectively circulates are formed. The head-side jacket is separated into an exhaust-port side jacket formed around an exhaust port, and a combustion-chamber-side jacket closer to a combustion chamber than the exhaust-port-side jacket. A heat exchanger is not formed in the main circulation path including the combustion-chamber-side jacket, but is formed in the sub circulation path excluding the combustion-chamber-side jacket and including the exhaust-port-side jacket.

Abstract: A transverse engine adjacent to a drive shaft includes an engine body having a crankshaft, a first pipe connected to the engine body and running such that an engine coolant flows therethrough, and an accessory drive system. The accessory drive system includes an endless outer belt wound between a crankshaft pulley and an alternator drive pulley. A portion of the first pipe forms a water protector located between the drive shaft and the outer belt and overlapping with the outer belt as viewed from the front or rear of the vehicle.

Abstract: A head-side jacket through which coolant flows is formed in a cylinder head. A main circulation path and a sub circulation path through which coolant fed from a coolant pump respectively circulates are formed. The head-side jacket is separated into an exhaust-port side jacket formed around an exhaust port, and a combustion-chamber-side jacket closer to a combustion chamber than the exhaust-port-side jacket. A heat exchanger is not formed in the main circulation path including the combustion-chamber-side jacket, but is formed in the sub circulation path excluding the combustion-chamber-side jacket and including the exhaust-port-side jacket.

Abstract: A transverse engine adjacent to a drive shaft includes an engine body having a crankshaft, a first pipe connected to the engine body and running such that an engine coolant flows therethrough, and an accessory drive system. The accessory drive system includes an endless outer belt wound between a crankshaft pulley and an alternator drive pulley. A portion of the first pipe forms a water protector located between the drive shaft and the outer belt and overlapping with the outer belt as viewed from the front or rear of the vehicle.

Abstract: A pump attaching portion is formed at a specified outside portion of an engine body beside a boss portion of a cylinder-head fastening bolt in such a manner that the pump attaching portion is continuous from the boss portion. The pump attaching portion has an attachment face, which contains a cooling-water introducing port, which is located on the outside of the flange wall and faces toward an engine front side in such a manner that the position of the attachment face is retreated from the flange wall. Accordingly, the sufficient pump-support rigidity can be ensured, restraining the pump attaching portion from projecting greatly toward the side of the engine body.

Abstract: A pump attaching portion is formed at a specified outside portion of an engine body beside a boss portion of a cylinder-head fastening bolt in such a manner that the pump attaching portion is continuous from the boss portion. The pump attaching portion has an attachment face, which contains a cooling-water introducing port, which is located on the outside of the flange wall and faces toward an engine front side in such a manner that the position of the attachment face is retreated from the flange wall. Accordingly, the sufficient pump-support rigidity can be ensured, restraining the pump attaching portion from projecting greatly toward the side of the engine body.