174 ENGINE 273 MPFI Radiator core and plastic tanks are susceptible to cracking due to impact and deformation. CAUTION • Unscrew the mounting screws of fan motor to fan shroud. • Remove the fan motor from shroud. Repair Procedure for Aluminum Radiator 1. Detection of Leakage Spot • Connect the inlet of the radiator to air supply at the gauge pressure of 1 bar • Seal all other outlet points. • Dip the radiator completely in a clean water tank. • Tilt the radiator and shake it vigorously to let the air bubbles trapped at the clinching area to escape. • Observe carefully for one minute and locate the source of air leakage on the radiator from the direction of air bubbles that are coming out of radiator. CAUTION • If the Leakage spot is at radiator core then follow the procedure given at Sr. No. 1.1 to seal the leakage. Do not use the water tank that is used for copper radiator. 1.1 Sealing the Leakage at Radiator Core Different procedure of sealing shall be followed for MINOR and MAJOR leaks in the radiator core. (Refer and followmanufacturing instructions before carrying repairs) Minor Leaks : Leak spots which are very minor are to be sealed in following manner. • Install the radiator on vehicle. • Pour the contents of ALUMASEAL in the radiator. • Fill proper quantity of coolant liquid. • Run the engine in idling speed for 20 minutes Major Leaks : Procedure of sealing major leaks in the radiator is as follows: • Wash the corewith cleanwater and brush to remove dirt, dust etc. • To remove the greasy spot on the core, apply thinner with cotton swab and take off the grease. • Dry the core using a dryer (Do not use heating source) • Mix adequate quantity of ARALDITE RESIN (Araldite rapid may be used in place of Araldite standard for faster drying & curing of seal) and HARDENER in the ratio of 1:1 and stir it thoroughly • Apply the mixture immediately at the leakage spot with the applicator. • Allow themixture to dry and harden under the shade at room temperature for 10-12 hour. Silver color paint may be used for touching up the araldite spots and impart the aluminum type appearance. Do not damage the fins during process. As the Araldite is inflammable do not dry it by using any heating source. Proper cleaning of leakage area is must for proper setting of Araldite or else it will come off. CAUTION
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