Gilera Runner Purejet 2007 Workshop Manual page 194

Cooling system
Removal
•
Detach the coolant hose from the
head, partially draining the system.
•
Remove the cylinder head.
•
Remove the two fixing screws and
hence the thermostat.
Check
1) Visually check that the thermostat is not dam-
aged.
2) Fill a metallic container with approx. 1 litre of
water.
Immerge the thermostat, and keep it in the centre
of the bowl.
Immerge the multimeter temperature probe, and
keep it close to the thermostat.
Heat up the bowl using the thermal gun.
Check the thermostat opening start temperature:
Heat up until the thermostat is completely open.
3) Replace the thermostat if not working properly.
CAUTION
TO EXECUTE THE TEST CORRECTLY, MAKE SURE NEI-
THER THE THERMOSTAT NOR THE THERMOMETER
TOUCHES THE CONTAINER.
Specific tooling
020331Y Digital multimeter
020151Y Air heater
Characteristic
Thermostat check: Opening start temperature
60±2°C
COOL SYS - 194
Runner Purejet