Gilera GP 800 i.e., Service Station Manual

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3. Expansion tank
4. Radiator breather pipe
5. Circuit filling pipe
6. Thermostat
7. By-pass pipe
8. Intake from radiator
9. Coupling (T-joint)
10. Front head outlet
11. Delivery to the cylinders
12. Pump
13. Intake from radiator
The cooling system is a forced circulation type system, with continuous venting and air pressurisation.
Circulation takes place by means of a centrifugal pump.
The pump delivers the coolant to the thermal units.
The two-way thermostat support is connected to the head outlet. One way is connected to the pump
and the other to the radiator.
The radiator output is directly connected to the pump.
The expansion tank is connected in parallel to the radiator.
The radiator hot box is connected to the upper side of the expansion tank (in air).
The radiator cold box is connected to the lower side of the expansion tank (in the fluid).
When the engine is cold, the thermostat output to the radiator is closed, even though there is still a little
flow for de-aeration obtained by a hole into the closing plate.
In this case, the circulation into the thermal units is active to ensure an even heating.
Once the working temperature has been reached, the main circulation on radiator and expansion tank
starts.
With the small openings in the thermostat there is a flow overlapping (re-circulation and main one).
When the temperature is higher, the thermostat allows excluding the re-circulation to favour the main
circulation.
In this case, the flow is consistent in the expansion tank as well, and this ensures a continuous automatic
venting.
For the system venting during the circuit filling step, there is a special union at the top of the head (see
filling rules).
To ensure cooling in case of poor dynamic ventilation, there is an electric fan controlled by the injection
system.
TECHNICAL SPECIFICATIONS
Specification Desc./Quantity
Cooling system capacity 2.4 l
Prescribed fluid AGIP PERMANENT SPEZIAL
GP 800 i.e.
Cooling system
COOL SYS - 3