COOLING SYSTEMTESTING AND ADJUSTINGTM 5-3805-263-14&P-2Checking Radiator Air FlowTools Needed: 9S7373 Air Meter Group.The 9S7373 Air Meter Group is used to check theair flow through the radiator core. Overheating canbe caused by installing the wrong fan guard, low fanspeed, or a restriction in the radiator core (clogging).The meter will give aid in finding a restriction in thecore.When making the checks fasten the transmis-sion in neutral, put the parking brakes on andlower all equipment. Make all checks at engineLOW IDLE and on the side of the radiator oppo-rite the fan. Wear eye protection.Take readings in a cross and diagonal pattern.Make a comparison of the readings in each line thesame distance from the center of the fan. Permitdifferences for restrictions such as guards, bracesand engine components which will cause a change inthe rate of air flow.NOTE: All readings are taken at engine LOWIDLE.If the readings are not within the ranges, stop theengine, put a strong light behind the core and inspectfor a restriction. If the restriction is from dirt removeby steam cleaning. If the restriction IS from bent finsuse 2H1822 Radiator Fin Comb to make the finsstraight.Checking Fan SpeedTools Needed: 1P5500 Portable Phototach Group.If the radiator core does not have a restriction,check the fan speed with the 1P5500 Portable Photo-tach Group.1-66
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