US Patent 7478612 Engine cooling apparatus

An engine cooling apparatus includes a cooling water outlet communicating with a water jacket provided in a cylinder block and a cylinder head provided on an intake port side of the cylinder head. A thermostat switches a path for cooling water discharged from the cooling water outlet, according to a cooling water temperature. A thermostat case for the thermostat is disposed downward of a line L extended from a coupling surface between a cylinder block and a cylinder head. The thermostat case and the cooling water outlet are connected via a connecting pipe. This arrangement makes it easy to secure a space for disposing the thermostat.