VESPA GTV 250 i.e. 2008 Service Station Manual page 133

Vespa GTV 250 i.e.
- Measure the internal diameter of each rocking
lever.
Check there are no signs of wear on the pad from
contact with the cam and on the jointed adjustment
plate.
Characteristic
Rocking lever inside diameter: Standard diam-
eter
Ø 12.000 - 12.011 mm
Rocking lever pin diameter: Standard diameter
Ø 11.977 - 11.985 mm
Camshaft check: Maximum admissible axial
clearance:
0.42 mm
Camshaft check: Standard axial clearance:
0.11 - 0.41 mm
Camshaft check: Standard height
Exhaust: 29.209 mm
Camshaft check: Standard height
Intake: 30.285 mm
Camshaft check: Minimum diameter permitted
Bearing B diameter: 19.950 mm
Camshaft check: Minimum diameter permitted
Bearing A Ø: 36.94 mm
Camshaft check: Standard diameter
Bearing B diameter: 19.959 - 19.98 mm
Camshaft check: Standard diameter
Bearing A Ø: 36.95 - 36.975 mm
Refitting the head and timing system components
- Fit the timing chain guide slider.
- Insert the centring dowel between the cylinder
head to the cylinder, fit the cylinder head gasket
and the cylinder head.
- Lubricate the stud bolt threading.
- Tighten up the nuts to an initial pre-torque of 7±1
N·m
Engine
ENG - 133