This is the two halves of the viscous fan clutch separated. It's a simple unit with an oil well, tight tolerances, and a quad ring that seals it. The brownish stain is dried-crusty old oil.
A collection of photographs.....
This is the two halves of the viscous fan clutch separated. It's a simple unit with an oil well, tight tolerances, and a quad ring that seals it. The brownish stain is dried-crusty old oil.