I did a piece on a somewhat similar project for a '95 E300. At the bottom is a link to a lot of pictures. It's not a really hard job. Good luck.

'95 E300 Vacuum Pump Cam Replacement Project

__________________
1995 E300 OM606 NA

Past:
2X1985 300D's
1998 Dodge Ram 2500 Cummins Diesel
1976 Peugeot 504 Diesel