Recently a friend and I changed the cogged v belt on my 1992 300-E. We were preplexed when the belt tensioner did not give way as much as we felt it might to remove the old belt. Reassembly was even more preplexing as the pointer was movable with a finger , should not this pointer be locked after tighting.

Everthing ran ok untill the next morning when I heard a loud squeel from the engine at start up, that disapated and was only breif. Yesterday morning I went to check the car again only to fine the noise presisted and the tension on the belt had releived it self.

With only 36,000 miles on this car can a belt tensioner go that soon? What is involved with replacing a new belt tensioner and should I expect to replace any other parts that go with it?
I would like to do the work this weekend any help would be appreciated!
Bob Geco
1992 300-E sportline orginal