5.2. Cooling System 5.2.1. General information This engine is water-cooling type. Heat from the combustion chamber and engine oil heat are cooled down by coolant and radiated to the outside, resulting in the normal operation of the engine. Looking into the cooling system, the water pumped up by the water pump circulates around the oil cooler through the water pipe to absorb the oil heat, and then flows through the water jacket of the cylinder block and water passage of the cylinder head to absorb the heat of the combustion chamber.
The water absorbing the oil heat and combustion chamber heat goes on to the thermostat through the water pipe, and circulates to the water pump if water temperature is lower than the valve opening temperature on the thermostat, while circulating to the radiator at water temperature higher than the valve opening temperature. At the radiator, the heat absorbed in the coolant is radiated to cool down and the coolant recirculates to the water pump. Cylinder head Cylinder head Oil cooler 4 4 4 8 3 7 2 6 1 5 Water pump Thermostat Cylinder block Radiator EC8OM004 z Specification Maintenance of Major Components - 126 - Item Specification 1.
Water pump Type Delivery Pumping speed Pumping back pressure Centrifugal type About 650 liter/min 3,060 rpm 760 mmHg 2. Thermostat Operating temperature 71 ∼ 85°C 3. Cooling fan and belt Fan diameter – Number of blades Fan belt tension 915 mm – 7 15 mm / deflection by thumb