ENGINE 273 MPFI 175 ENGINE Radiator Cleaning / Flushing Radiator should be cleaned at regular interval to achieve optimum performance. Improper cleaning would lead to adverse effect; hence it is recommended that the following procedure be adopted. Internal Cleaning of Radiator 1. Close all ports except inlet and outlet. 2. Inject pressurized clean hot water (pressure range 0.5~1bar) through inlet at flow rate closer to the rated engine coolant flow rate for 10min. 3. Allow the dirt / water to come out through outlet. 4. Blow air at 6 bar pressure through inlet/outlet for 5 times (30 s each). 5. Allow complete drying of Radiator before installation on vehicle. External Cleaning of Radiator 1. Blow pressurized air at 6 bar for 2 min across the core without damaging the tubes and fins. 2. Immerse the core in mild soap water (pH<9) for 30 min with all openings closed. If possible agitate / shake the radiator for 10 times. If the core has deposits of grease/oil, it is advisable to immerse the core in kerosene bath before the soap water solution. 3. Spray water jet at 50~70 PSI pressure across the core at a distance of 2m without damaging the tubes & fins. 4. Ensure that dust/mud/grease is removed in totally. 5. Allow complete drying of Radiator before installation on vehicle. Radiator Installation • Ensure that all the openings of the radiator are closed properly except the inlet / outlet. • Install the radiator on the vehicle ensuring proper alignment, damping etc. as applicable. • Connect the inlet and outlet pipes and clamp them properly, Fit the fan shroud and etc. • Fill the radiator with proper quantity of FRESH PREMIXEDCOOLANT as recommended. Auxiliary Tank • If the source of leakage is auxiliary tank then replace the auxiliary tank . • Take out the auxiliary tank by unscrewing the mounting screws to the header of radiator. • Take out the auxiliary tank from its seat. • Clean the area of header plate where the tank is mounted. • Place new auxiliary tank in place. • Fix the member support & tighten the bolts properly. Thermostat Defective thermostat may cause • Over cooling due to thermostat valve sticking in full Open position. • Over heating due to thermostat valve sticking in partial/full closed condition. When above defect are observe, thermostat needs checking. 1. Remove thermostat element from thermostat housing 2. Mount thermostat element in suitable fixture and 3. Place the fixture in vessel full with water. 4. Fix dial gauge with its spindle on valve surface with a pretension of 0.5 mm 5. Heat a vessel and measure the water temperature with proper thermometer. 6. Note down the temperaturewhen dial gauge needle start moving valve indicating valve open. 7. Note down the water temperature for needlemovement of 8 mm (valve full open position). 8. The opening temperature and full open temperature as measure should be as mentioned. If they do not meet the specifications, replace the thermostat element. Water Pump Assembly • 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 ( Refer Lubrication System). Water Pump Characteristics 5500 5500 50 litre/minute Engine RPM Pump RPM Flow rate @ 0.8 bar back pressure
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