Measuring governor pressure - AR27.10-P-0180-02A

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.

Fig 1: Identifying Tester (123 589 04 21 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Drive onto the roller dynamometer or on the road in selector lever position "D". If no governor pressure is indicated, remove and clean the centrifugal governor.

The standard formula applies to all vehicles:

Governor pressure >0.5 bar at v > 30 km/h

The pressure oil line must be unscrewed at the measurement connection for governor pressure on vehicles with external transmission upshift delay.

First tighten the pressure oil line (MR) securely, then tighten oil line (0) and holder for switchover valve (Y3/2).

Fig 2: Identifying Oil Pan Outlet, Governor Pressure Measurement Connection And Shift Point Retard Solenoid Valve

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.