Water cooling device of vertical multi-cylinder engine

The present invention relates to such a water cooling device of a vertical multi-cylinder engine as mentioned below. The water cooling device of the vertical multi-cylinder engine comprises a cylinder block (1) one side wall of which is provided with a side water passage (3) running along a longitudinal direction of the cylinder block (1). The cylinder block (1) has an interior area provided with a cylinder jacket (4). Cooling water from a radiator is introduced into the cylinder jacket (4) through the side water passage (3). The side water passage (3) has an outlet (5) opposed to a lower portion of the cylinder jacket (4).