1 Remove the distributor cap.
2 Disconnect the vacuum hose and remove the screws securing the vacuum control unit.
3 Unhook the vacuum control unit.
To refit
1 Rotate the Hall sensor clockwise until it butts against its stop.
2 Hook the vacuum control unit on the pin.
3 Fit the retaining screws.
4 Fit the dust cover, rotor, distributor cap and vacuum hose.