SAFARI

87 ENGINE2.2LDICOR Fig. 193 Fig. 194 Water Pump (Fig. 193) Check water pump for free rotation. Check water pump for flow rate at specified rpm. Check for water leakage through leakage hole. It indicates that water seal is damaged and leaking. Replace the water pump if necessary. For water pump removal and fitment procedure please refer engineoverhaul section. Pump flow rate 165 lpm at 4000 rpm against the back pressure at 1.4 bar. Thermostat (Fig. 194) Thermostat is installed in cooling system between radiator outlet & the water pump. Working principle of thermostat 1. For cold engine (immediately after starting) : Thermostat does not allow coolant to flow toWater pump (Thermostat valve in closed position) instead coolant flows from radiator bypass pipe to engine. This helps for attaining engine working temperature in a very short period. 2. As soon as the coolant temperature reaches opening temperature of thermostat , the thermostat valve starts opening gradually and coolant flow starts from radiator to water pump. At the same time thermostat by pass starts closing gradually. 3. As the engine working temperature reaches thermostat full open temperature, the thermostat valve opens fully and thermostat by-pass valve closes completely. Under such conditionmaximum quantity of engine coolant flows from radiator to water pump. l Thermostat Start opening temperature : 87ºC l Full open temperature : 98ºC l Leakage through main valve (including seepage hole) at room temperature and pressure of 1 kg/ cm2 is 10 Liters/hr. l Maximum leakage through by pass at full open temperature or main flow rate of 165 lpm is 1.5 Liters/minute.