52 486 PL ENGINE P RADIATOR : CLEANING : Fit radiator cap, close radiator drain cock firmly. Place radiator upside down on ground Connect water supply line to radiator bottom tank at its outlet. Slowly increase water supply to radiator. Maximum pressure in system should not exceed 1.5 bar. Continue water flow till outlet water is visually clean and clear. Remove connections made for cleaning. Remove radiator cap and suitably plug inlet and outlet of radiator. Completely fill radiator with measured quantity of water. If radiator capacity is less than specified, it reflects chocked tube. Re-clean/de-scale radiator using suitable cleaning compounds as per manufacturer’s instructions. Fit back radiator cap. Blow compressed air through radiator fins from engine side to clean air passages. Do not brush or scrape radiator core in any way. TESTING : Remove radiator cap. Suitably plug radiator inlet, outlet and filling neck. Remove radiator drain cock adapter. With suitable adopter connect pressurised air supply to radiator drain cock hole. Submerge radiator in water tank. Admit air at 1.5 bar (max) into radiator. Check for leaks and if any suitably mark them. Take out radiator from water tank Disconnect air supply connections. Remove all plugs. Rectify leaks by soldering. Recheck radiator for leakage. Fit back radiator drain cock adapter. Fit back radiator cap. INSTRUCTION FOR SOLDERING : Use 40% tin content solder. This solder has higher tin content and hence lower melting temperature than used in manufacture of radiator; hence is safe for any effect in original soldering nearby. Use non corrosive fluxes for soldering. Neutralize and wash residues to avoid any consequent damage. CAUTION : Acid should not be used for the above purpose. CHECKING CAP Fig. 117 Check radiator cap for perfect seating in filler neck. Check radiator cap for l pressure valve opening l vacuum valve opening. Important : Replace defective cap with new one of recommended rating. Fig. 117 (VACUUM VALVE) Pressure valve opening pressure 1.0 kg/cm2 (gauge) Vacuum valve opening Pressure 0.05 kg/cm2 Max.
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