Changing serpentine belt
 

Does any one have the procedures or link to changing the serpentine belt on the 140, 1997 S 500?

The belt tensioner on the S 500 seems different, I have changed a couple of times the belt on the 104, 1995 E 320, a bit of a bear, but never on a S 500.

Any help or advise will be appreciate

The older M104 had that rubber bushing tensioner that always went out. Looks like your S500 has the updated metal spring tensioner.

The tensioner on my M112 looks similar. Put a wrench on the torx fitting of the tensioner and turn CCW with one hand, slip belt off of a pulley with other hand, and then slowly let the wrench turn CW until tension is gone.