Radiator check

The cooling system operates at excess pressure compared to atmospheric pressure. The plug of the expansion tank is equipped with a valve with a spring selected in such a way that the valve opens when the pressure rises to 1.2-1.5 kg / cm². Increasing the pressure in the system raises the boiling point of the liquid.



A radiator test pump is required to test the filler plug valve. Connect the pump to the plug (pic. 102) and pump air until the valve opens. This should happen when the above pressure is reached (1.5-2 kg/cm²) , otherwise the plug must be replaced. Using the same pump, you can check the tightness of the cooling system. To do this, the pump must be attached to the expansion tank and, by raising the pressure to 1.0 kg / cm², check if this pressure will last at least 2 minutes. A rapid drop in pressure means that the cooling system is not airtight. Coolant leaks can be found by maintaining high pressure in the system.