VESPA GTS 250 I.E. Workshop Manual page 160

Engine
Removal
- Undo the two clamping screws in the figure and
remove the cover over the pump control crown.
- Block the rotation of the oil pump control pulley
with a screwdriver inserted through one of its two
holes.
- Remove the central screw with Belleville washer,
as shown in the diagram.
- Remove the chain with the crown.
- Remove the control sprocket with relative O-ring.
- Remove the oil pump by unscrewing the two
screws in the figure.
- Remove the oil pump seal.
N.B.
IT IS ADVISABLE TO MARK THE CHAIN IN OR-
DER TO ENSURE THAT THE INITIAL DIREC-
TION OF ROTATION IS MAINTAINED.
Inspection
- Remove the two screws and the oil pump cover.
- Remove the clip retaining the innermost rotor.
- Remove and wash the rotors thoroughly with pet-
rol and compressed air.
- Reassemble the rotors in the pump body, keep-
ing the two reference marks visible Replace the
clip.
- Check the clearance between the rotors in the
position shown in the diagram.
ENG - 62
Vespa GTS 250 I.E.