COOLING SYSTEMTESTING AND ADJUSTINGTM 5-3805-263-14&P-2C O O L I N G S Y S T E MThe engine has a pressure type cooling system. Apressure type cooling system gives two advantages.The first advantage is that the cooling system canoperate safely at a temperature that is higher thanthe normal point where water changes to steam. Thesecond advantage is that this type system preventscavitation (air in inlet of pump) in the water pump.With this type system it is more difficult for an air orsteam pocket to form in the cooling system.The cause for an engine getting too hot is generallybecause regular inspections of the cooling systemwere not done. Make a visual inspection of the cool-ing system before testing with testing equipment.VISUAL INSPECTION OF THE COOLINGSYSTEM1.2.3.4.5.6.7.8.Check coolant level in the cooling system.Look for leaks in the system.Look for bent radiator fins. Be sure that air flowthrough the radiator does not have a restriction.Inspect the drive for the fan.Check for damage to the fan blades.Look for air or combustion gas in the coolingsystem.Inspect the pressure cap and the sealing surfacefor the cap. The sealing surface must be clean.Look for large amounts of dirt in the radiatorcore and on the engine.TESTING THE COOLING SYSTEMRemember that temperature and pressure worktogether. When making a diagnosis of a coolingsystem problem, temperature and pressure mustboth be checked. Cooling system pressure will havepoint (steam) of water.an effect on cooling system temperatures. For anexample, look at the chart to see the effect of pres-sure and the height above sea level on the boilingChecking Coolant TemperaturesTools Needed: 9S9102 Thermistor Thermometer Group.The 9S9102 Thermistor Thermometer Group isused in the diagnosis of overheating (engine runningtoo hot) or overcooling (engine running too cool)problems. This group can be used to check the differ-ent parts of the cooling system.1-64
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