I was doing some (what I thought was) preventative maintenance on my 1995 c280. In the process of replacing the aforementioned belt i ran into a little problem. What I did was to remove the fan shroud, loosen the locking nut on the tensioner and then proceeded to loosen the 13mm nut which slackens the belt. The belt got a little slack but I didn't think it was quite lose enough so I kept turning. After a bit I noticed that the belt wasn't really getting any looser.
I noticed that the although the top of the nut was turning the threaded rod wasn't turning at all. Now that I have the belt on I can't tighten it. Before I go and rip this thing all apart I was hoping maybe someone had a suggestion. Isn't the nut supposed to turn the threaded rod, Its hard to see and I don't really want to take this all apart if I don't have to. I'm stuck without a vehicle at the moment so if anyone has an idea please respond asap.