Here's a link on changing your tensioner and belt. Mercedes Benz Belt Tensioner Replacement
First memorize position of old belt. With big screwdriver or bar relieve tensioner force spring. Keep hair out the way. Belt will cone off easy. Puttin new one on can b harder cause of beginn at rite pulley..go slow
SOURCE: need a diagram for serpentine belt replacement for mercedes benz
Below is a link for your diagram. Best of luck!
Greg
http://www.mvreader.com/multiview/dayco/zoom.php?zoom_item=C0002R&l=n&catalog=auto&category=2
SOURCE: 2001 Mercedes-Benz S430 serpentine belt diagram
Check the underside of your hood for a belt diagram. If it's not there, call your dealer with your VIN number to get the correct diagram.
SOURCE: need serpentine belt diagram
My sincere apologies for the severely delayed response.
I am going back to answer - unanswered questions. I have only been on this site for the past 4-months. Questions Posted have exploded (+55%) since joining.
I do not know if you still need this information, but I am answering it anyway. You may want to Print the Diagrams for future use.
CLICK on the following LINK. It has the Belt Diagrams you will need.
If you would: Before Clicking: Let me know if this helped you, or if you have any additional information or questions. Feel Free to contact me at FixYa.com!
Again my sincerest apologies...
Thanks.
http://www.2carpros.com/car_repair_information/year/1987/make/mercedes-benz/model/190e/1987_mercedes-benz_190e_drive_belt_routing_diagram.htm
SOURCE: I,would like a diagram for
2.6L - 103.940 engine, there is two belt routings, so here both, hope one helps you. 
SOURCE: how to change a serpentine belt clk320 2003
just put a socket and rachet on the bolt for the tensioner pulley and move the tensioner to the right to loosen the slack on the belt.
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