Gilera 633721 Workshop Manual page 111

Nexus 500 euro 3
Engine
- Remove the blow-by reed valve with the relevant
sealing gasket.
- Unscrew the fastening screw and remove the gas
outlet union with the relevant O-ring.
- Remove the water pump impeller by unscrewing
it from the relevant shaft.
N.B.
THE THREADING IS CLOCKWISE. IT IS ADVISABLE TO
PREVENT THE SHAFT ROTATION BY INSERTING A 12-MM
WRENCH INTO THE DRIVE.
- Extract the shaft with the relevant abutment
washer.
ENG - 111