Gilera 633721 Workshop Manual page 39

Nexus 500 euro 3
Cooling system
If noise or loss of liquid at the drain bore of the water pump is discovered, it will be necessary to overhaul
the pump as described in chapter "Flywheel cover".
Proceed to carry out a few preliminary operations as described below:
- Place the scooter on its centre stand and on flat ground.
- Remove the right footrest as described in the «Bodywork» Chapter.
- Remove the muffler to access the flywheel cover, as described in the «Engine» Chapter.
- Empty the cooling system by removing the couplings on the pump cover and the filler plug on the
expansion tank.
CAUTION
THIS OPERATION MUST BE CARRIED OUT WHEN THE ENGINE IS COLD.
- Remove the water pump cover as indicated in the
figure by loosening the 6 retaining screws.
- Proceeding as described in chapter "Engine",
partially drain the system and overhaul the pump.
- Refill and drain the system again once after hav-
ing repaired the damaged and reinstalled all the
components.
N.B.
FOR CHANGING THE COOLANT AND BLEEDING THE
SYSTEM, SEE CHAPTER "COOLING SYSTEM".
Characteristic
Cooling system
approx. 1.8 litres
Level check
The coolant level must checked every 6,000 kilo-
metres with a cold engine, in the way shown be-
low:
- Place the scooter on its centre stand and on flat
ground.
- Remove the cap of the expansion tank.
- To check the level, it is necessary to look inside
the expansion tank:
The reference mark in the figure shows the correct
coolant level.
-The coolant consists of an ethylene glycol and corrosion inhibitor based 50% de-ionised water- anti-
freeze solution mix.
CAUTION
Maintenance
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