PIAGGIO Vespa LX 150 4T Euro 3 Service Station Manual page 121

Vespa LX 125 - 150 4T Euro 3
In case of anomalies, replace the damaged com-
ponents.
Characteristic
Minimum diameter permitted
Ø 11.970 mm
Maximum diameter admitted
Ø 12.030 mm
Refitting the head and timing system components
- Fit the timing chain guide pad.
- Insert the head and cylinder centring dowels, fit the head gasket and the head on the cylinder.
-Screw the nuts and lock them in a crossed sequence and in 2 or 3 stages to the specific torque.
Locking torques (N*m)
Locking torque 28 ÷ 30
- Fit the two screws on the outside of the timing
chain side and tighten them to the specified torque.
N.B.
BEFORE INSTALLING THE HEAD, MAKE
SURE THAT THE LUBRICATION CHANNEL IS
CLEAN USING A COMPRESSED AIR JET.
Locking torques (N*m)
Locking torque 11 ÷ 13
- Fit the timing chain sprocket wheel on the crank-
shaft, with the chamfer facing the insertion side.
- Loop the timing chain around the sprocket on the
crankshaft.
- Fit the tensioner pad by the cylinder head.
- Fit the spacer and the screw fastener.
- Fit the pin, the outlet rocking lever, the spring
washer and the inlet rocking lever.
- Lubricate the 2 rocking levers through the holes
at the top.
- Lubricate the 2 bearings and insert the camshaft
in the cylinder head with the cams opposing the
rocking levers.
Engine
ENG - 37