I recently replaced the alternator in my 300E and I didn't have to mess with the tensioner either. I imagine that the entire belt could be replaced in a similar way. Removing the alternator is dead easy - two bolts.
To quote myself...
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To install the new alternator, I slipped it roughly into place and got the belt on the pulley first. I then attached the upper mounting bolt. Then, from underneath the car, I pulled down hard to get the alternator into place for the lower mounting bolt and in doing so tensioned the belt. It took some strength, but it wasn't that hard. I had the lower bolt ready in place, so once I had leveraged the alternator into position, I slipped the bolt home and tightened it. That's it, no removal of the belt necessary - not sure if everyone is this lucky, I'd hate to mess around with the tensioner. Belt tension is fine (and the serpentine belt is in good condition in my car, btw).
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Chris
2007 E550 4Matic - 61,000 Km - Iridium Silver, black leather, Sport package, Premium 2 package
2007 GL450 4Matic - 62,000 Km - Obsidian Black Metallic, black leather, all options
1998 E430 - sold
1989 300E - 333,000 Km - sold
1977 280E - sold
1971 250 - retired
"And a frign hat. They gave me a hat at the annual benefits meeting. I said. how does this benefit me. I dont have anything from the company.. So they gave me a hat." - TheDon
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