6.2. Cooling System 6.2.1. 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 tem- perature 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. Thermostat Water pipe Cylinder head Radiator Cylinder block Oil cooler Water pump Air compressor EQM4001I 6.2.2. Specification - 152 - MAINTENANCE OF MAJOR COMPONENTS Description Specification 1.
Water pump Type Centrifugal type Delivery About 350 liter/min Pumping speed 2,100 rpm Pumping back pressure 760 mmHg 2. Thermostat Operating temperature 71 ~ 85°C 3. Cooling fan and belt Fan diameter - Number of blades l812.8 mm - 9 Fan belt tension 15 mm / deflection by thumb