12 SECTION 1 - GENERAL SPECIFICATIONS F2B CURSOR EURO 4 ENGINES COOLING Description The engine cooling system is of the closed-circuit, forced circulation type. It consists mainly of the following components: - expansion tank, not supplied (by IVECO); - a heat exchanger to cool down lubrication oil; - a water pump with centrifugal system incorporated in the cylinder block; - fan, not supplied; - a 2-way thermostat controlling the coolant circulation. Operation The water pump is actuated by the crankshaft through a poli-V belt and sends coolant to the cylinder block, especially to the cylinder head (bigger quantity).
When the coolant temperature reaches and overcomes the operating temperature, the thermostat is opened and from here the coolant flows into the radiator and is cooled down by the fan. The pressure inside the system, due to temperature change, is adequately controlled through the expansion vessel. Figure 14 Water leaving the thermostat Water entering the pump Water circulating in the engine 92824 Base - September 2006 Print P1D32C002 E