VESPA LX 4T USA Workshop Manual page 108

Engine
Inspection
- Remove the two screws and the oil pump cover.
- Remove the clip retaining the innermost rotor.
- Remove and wash the rotors thoroughly with a
degreasing solvent and compressed air.
- Reassemble the rotors in the pump body, keep-
ing the two reference marks visible Replace the
clip.
- Measure distance between rotors (inner rotor/
outer rotor) with a thickness gauge in the position
shown in the picture.
Characteristic
Admissible maximum clearance 1
0.15 mm
Measure the distance between the outer rotor and
the pump body (see figure).
Characteristic
Admissible maximum clearance 2
0.20 mm
- Check the axial clearance of the rotors using a
trued bar as reference as shown in the figure.
N.B.
MAKE SURE THE TRUED BAR IS POSITIONED PROPERLY
ON THE TWO POINTS ON THE PUMP BODY.
Characteristic
Admissible maximum clearance 3
0.09 mm
ENG - 108
LX 4T USA