4.8.2 Purpose of the cooling system
Figure 4.31 Functional diagram of engine cooling system.
The cooling system is used for maintaining the operating temperature of the engine (within the range of 80-95 °C) by forcibly removing heat from the engine cylinders and transferring it to the ambient air. The need for a cooling system is due to the fact that engine parts that come into contact with hot gases get very hot during operation. In case if the internal parts of the engine are not cooled, then due to overheating, the lubricant layer between the parts can burn out and the moving parts will jam due to their excessive expansion.
Cooling systems of almost all modern cars do not differ from each other. A schematic, generalized diagram of the cooling system operation is shown in Figure 4.31, where the liquid, which is heated by the engine parts is marked in red; and the liquid, which is cooled in the system radiator is blue.
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