Installing the viscous coupling housing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.
Check that the mating surfaces between the final drive and the viscous coupling housing are clean.
Lubricate the mating surface on the viscous coupling.
Install the housing with the viscous coupling onto the final drive. Tighten the screws. Tighten to 25 Nm .