On my 87 300e there was a "y" bracket that attached the tensioner to the front of the engine block. A PITA, but doable to remove. The directions mention these three bolts (one that has a nut behind the power steering pump (I believe).

The only way I was able to loosen the bolts holding free-spinning clutches off the various pumps was to use a Craftsman strap wrench and some elbow grease.

Don't lose heart, keep at it and keep track of how stuff came off. You'll get it.

BTW, the write-up was from Duke, not me.

__________________
1987 300e "200,000+ and going strong"