Engine coolant is used to cool charge air in TWD engines. Coolant is pumped through the circuit via a pipe from the radiator to the charge air cooler. After coolant has passed through the charge air cooler tubes it is fed to the pump. The illustration shows twin charge air coolers on a TWD1643GE engine.
Pump suction capacity depends on coolant pressure and temperature. An increase in coolant temperature reduces suction capacity. In order to avoid cavitation there must be a static pressure on the suction side of the pump. To achieve this there must be a hose from the expansion tank to the suction side of the pump.
The function of the cooling water system is to transport heat energy away from the engine and accessory components to the radiator. The cooling water system consists of the coolant and the following components:
If an air conditioning condenser is used it is normally located in front of the radiator on a sucking fan system. The condenser causes a cooling air pressure drop and temperature rise. A condenser in operation may raise the temperature by 3-5 °C (37.4–41 °F).
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