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Figure 244 5432 COOLING Description The engine cooling system is the type with forced circulation - An expansion tank whose plug has two valves incorporated in it: an outlet and an inlet, which govern - A coolant level sensor at the base of the expansion tank. - A pressure switch (3) notifies EDC central unit when pressure inside expansion tank exceeds 0.4 bar value; in - An engine cooling module to dissipate the heat taken from the engine by the coolant with a heat exchanger - A heat exchanger to cool the lubricating oil. - A centrifugal water pump incorporated in the crankcase. - An electric fan comprising an electromagnetic coupling on whose shaft a hub turns idle that is fitted with an - A 3-way thermostat governing the circulation of the coolant. Operation The water pump driven by a poly-V belt by the crankshaft - to keep the system slightly pressurized so as to raise the boiling point of the coolant; - to discharge into the atmosphere the excess pressure produced in case of high coolant temperatures. The function of the inlet valve (1) is to permit transferring the ± 0.1 kg/cm 2 . Inlet valve opening 0.005 — 0.02 kg/cm 2 . 88063 B Thermostat closed C Thermostat open Hot 580 F1C ENGINE D AILY Base - May 2004 |