WATER-COOLED ENGINE

Abstract

Provided is a water-cooled engine in which cooling performance of a rear end-side head portion 17a is improved. This water-cooled engine is provided with a plurality of water floating ports 18 that are opened on the peripheral side of respective cylinders 16 between a cylinder jacket 2a and a head jacket 2b. Engine cooling water 9 floats up from the cylinder jacket 2a through the plurality of water floating ports 18 to the head jacket 2b. The head jacket 2b is provided with a rear end-side jacket portion 2ba that a rear end-side water floating port 18a faces, the rear end-side water floating port 18a being one of the plurality of water floating ports 18 which is at a rear end-side head portion 17a of the cylinder head 17. The water-cooled engine is provided with a water-cooled oil cooler 19, a cooler feeding pipe 20 extending from the head jacket 2b to the oil cooler 19, and a cooler drainage pipe 21 extending from the oil cooler 19 to a water pump 8. The cooler feeding pipe 20 is led out from the rear end-side jacket portion 2ba.

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