VESPA LX 150 4T Euro 3 Service Station Manual page 108

Engine
- Check there is no wear on the cam shaft retaining
plate and its associated groove on the cam shaft.
- If any of the above dimensions are outside the
specified limits, or there are signs of excessive
wear, replace the defective components with new
ones.
Characteristic
Maximum axial clearance admitted
0.42 mm
- Check there are no signs of wear on the auto-
matic valve lifter cam, or the end-of stroke roller,
or the rubber buffer on the automatic valve-lifter
retaining cover.
- Check that the valve lifter spring has not yielded.
- Replace any defective or worn components.
- Check there are no signs of scoring or wear on
the rocking lever bolt.
Check there are no signs of wear on the pad from
contact with the cam and on the jointed adjustment
plate.
- Measure the internal diameter of each rocking
lever.
-Check that the elastic washer dedicated to the
axle clearance of the rocking levers is not worn. -
In case of failure, replace the damaged compo-
nents.
Characteristic
Minimum diameter permitted
Ø 11.970 mm
Maximum diameter allowed
Ø 12.030 mm
Refitting the head and timing system components
- Fit the timing chain guide slider.
- Insert the head and cylinder alignment dowels, fit the head gasket and the head on the cylinder.
ENG - 108
Vespa LX 125 - 150 4T Euro 3