911 Turbo Cabriolet (996) F6-3.6L Turbo (2004)
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Viscous Coupling: Testing and Inspection
Checking Function of Installed Viscous Clutch
Checking function of installed viscous clutch
1. Connect Porsche System Tester 2 and select -Actual values- menu (PSM speed).
2. Drive front wheels of the vehicle onto the roller brake tester.
3. Switch the engine off, set the hand brake and shift the transmission to neutral.
4. When the brake-tester rollers have started, switch the ignition on and press the Continue key)) of the Porsche System Tester 2. The Tester then
returns to the point at which diagnosis was interrupted.
5. Drive front wheels by means of the brake tester rollers at a speed of 3 km/h, 4 km/h or 5 km/h.
6. Measure traction 6 times in three minutes. Measure the first traction value after 30 seconds operating time, then carry out five more measurements
every 30 seconds.
7. The viscous clutch functions properly if the traction of the front wheels lies within the limit curves in the diagram, depending on the drive speed of
the roller brake tester rollers.
Diagram for roller brake tester - speed 5 km/h:
A Relative measuring time in minutes
B Traction at the front wheels in Newtons (N)
Diagram for roller brake tester - speed 4 km/h:
