40 4 DLT ENGINE INSPECTION AND CLEANING RADIATOR AND CAP Cleaning Fit radiator cap. Close radiator drain cock firmly. Refer Figure 65. 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 1.0 bar. Continue water flow till outlet water is visually clean and clear. Remove connection 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 choked tube. Reclean / de-scale radiator using suitable cleaning compound as per manufacturer’s instruction. Fit back radiator cap. Blow compressed air or oil/grease dissolved with water, through radiator fins from engine side to clean air passages. Do not brush or scrape radiator core in any way. Testing for leaks Remove radiator cap. Suitably plug radiator inlet, outlet and filling neck. Remove radiator drain cock adapter. With suitable adapter connect pressurised air supply to radiator drain cock hole. Submerge radiator in water tank. Admit air at 1.0 bar (max) into radiator. Check for leaks and if any suitably mark them. Fig. 65 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 Cr-Br. Radiators Use 40% tin content solder. This solder has higher tin content and hence lower melting temperature than used in manufacture of radiator. Use of this will not have any effect on original soldering near by. Use non corrosive fluxes for soldering. Neutralize and wash residues to avoid any consequent damage. Acid should not be used for this purpose.
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