Das Ende der Visco-Kupplung als Allradantriebskonzept - GRIN
Visco-Kupplung – Wikipedia
T4 Viscous Coupling overpressure | Here is another T4 Viscous Coupling with a "little" overpressure. This might be the reason for cracked t4 syncro housings. #vwkern | By Visco Werkstatt Kern | Facebook