Checking regulating valve for ease of movement - AR27.10-P-0280-02A

WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.

Remove locking ring (40) and disconnect helical gear (41).
Installation : Mount helical gear (41) so that the driver pin engages in the bore in the helical gear.

Fig 1: Identifying Locking Ring And Helical Gear
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Move flyweights, checking the regulating valve in the openings for ease of movement (arrows).
It must be possible to move the regulating valve easily, if necessary wash out and blow out the centrifugal governor with petroleum ether. If it is not possible to free off the regulating valve in this way, replace the centrifugal governor.

Fig 2: Identifying Regulating Valve Openings For Ease Of Movement
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.