PIAGGIO 500 cc Service Manual page 84

- Make sure the head lubrication duct is well clean. If
necessary, clean with a jet of compressed air.
- Assemble the head.
- Oil the studs and the 4 fixing nuts.
- Screw the 4 fixing nuts in a crossed manner to the pre-
torque value of 20 N·m
- Afterwards, cross-tighten them to the prescribed
torque.
Tightening torque:
Head fixing nuts: 42 - 45 N·m
- Lock the fixing nuts, exhaust and intake side, to the
prescribed torque.
Tightening torque:
Head fixing nuts, exhaust/intake: 10 - 12 N·m
- Lock the 3 side fixings shown in the figure to the
prescribed torque.
Tightening torque:
Head fixing screws: 10 - 12 N·m
- Assemble the coolant temperature sensor with the
washer and tighten to the prescribed torque.
Warning
- Failure to observe the recommended
tightening torques may cause damage to the sensor.
Tightening torque:
Coolant temperature sensor: 10 - 12 N·m
7 - 22
Thermal unit and timing system
05_217
05_172
05_218
05_171