6.3.2. Excessive pressure in the cooling system
The cooling system at the working engine is under pressure. Therefore the boiling point rises from +100 to +126 °C.
High temperature promotes more economic operation of the engine. Excessive pressure in the cooling system makes about 1,4-1,5 bars. If at the hot engine pressure in the cooling system raises, opens the reducing valve on a cover of a broad tank, and pressure is dumped in the atmosphere.