System description
The coolingsystem is of the forced circulation type, with continuous venting and airpressurisation.
Circulationtakes places by a centrifugal pump driven by the countershaft.
The pumpdelivers the cooling fluid to the thermal unit.
The two-waythermostat support is connected in output to the head. One way is connected tothe pump and the other to
the radiator (of the horizontal circulation type).
The radiatoroutput is directly connected to the pump.
Theexpansion tank is connected in parallel to the radiator.
The radiatorhot box is connected to the upper side of the expansion tank (in air).
The radiatorcold box is connected to the lower side of the expansion tank (in the fluid).
When theengine is cold, the thermostat output to the radiator is closed, even thoughthere is still a little flow for de-
aeration obtained by a hole into theclosing plate.
In thiscase, the circulation into the thermal unit is active to ensure an evenheating.
Once theworking temperature has been reached, the main circulation on radiator andexpansion tank starts.
With thesmall openings in the thermostat there is a flow overlapping (recirculation andmain one).
When thetemperature is higher, the thermostat allows excluding the recirculation tofavour the main circulation.
In thiscase, the flow is consistent in the expansion tank as well, and this ensures acontinuous automatic venting.
For thesystem venting during the circuit filling step, there is a specific union atthe top of the head (see filling rules).
To ensurecooling in case of poor dynamic ventilation, there is an electric fancontrolled by the injection system.
Cooling System
P.4-2
PGO BR-500 ENGINE
Содержание BR-500
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Страница 61: ... Check that the blow by circuit reed closes properly PGO BR 500 ENGINE P 10 42 Flywheel Cover ...
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Страница 272: ...PGO BR 500 ENGINE P 5 14 ...
Страница 273: ...INDEX OF TOPICS COOLING SYSTEM 4 ...
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