Abstract

A coolant passage system in a V-shaped internal combustion engine includes a coolant pump disposed on one side of the engine in the direction of the crankshaft at the V-shaped space between the cylinder banks for delivering a coolant into coolant jackets defined respectively in the cylinder banks, the coolant pump having an inlet opening toward the V-shaped space. A collecting conduit is disposed on an opposite side of the engine at the V-shaped space for delivering the coolant from the coolant jackets to a radiator. A valve casing housing a thermovalve therein for delivering the coolant from said radiator is integrally formed with the collecting conduit and has an outlet opening toward the V-shaped space. The inlet of the coolant pump and the outlet of the collecting conduit are interconnected by a connecting pipe disposed in the V-shaped space.