Cooling System

Cooling system

The coolant pump pumps coolant through the cylinder block, and also cools the cylinder head, cylinder sleeves, spark plug wells, intake ducts and fuel injection nozzles. The coolant flows in at the pump and passes through a number of channels before it collects and then flows out to the thermostat housing. If the thermostat housing is closed, the coolant passes via the by-pass channel directly to the coolant pump to then circulate through the cylinder block again. In principle, its appearance is the same as the oil cooler for the transmission. Both have an inlet and outlet. The oil cooler is constructed in layers where water and oil flow around each other. Having flowed through the restrictions in the oil ways, the pressure in the system falls. When the fuel combusts in the engine, the result is both mechanical work and excess energy. The excess heat is taken away from the engine via the exhaust gases by convection to the air in the engine compartment and also by transfer to the coolant and engine oil. The cooling system is a closed system.