Thanks very much Arthur.
I wish my tensioner was the same as the drawing you pointed me to here:

http://mb.auto.pl/wis/w124/CD01/Engine/104/05-3100.pdf

I have unbolted the air pump and swiveled it to the side but I still do not have clearance to remove the tensioner. It looks to me like I have to remove the air pump to get that guy out. Look at the third picture from the top on this site:

http://home.earthlink.net/~sasjzl/mercedesheadgasketreplacementjourney/

I have the manual both Haynes and CD and do not see how that air pump is removed.

Thanks very much,
Jim Lee
1995 e320