No one else has mentioned it, so I'll put it in here:

When you replace the tensioner, there is a Y-bracket with three bolt holes. Be aware that the hole at the bottom of the Y, which would be pointing towards the passenger's side, is a wet hole (oil). You need to seal the bracket to the front cover and then put sealant on the dry bolt. Let it all cure overnight before starting the car back up. You can use the orange Permatex and it will be fine, no need to use the MB spec goop.

This is all in the manuals, I just didn't know if you had them or not and this will keep you from an annoying leak after spending all of your time doing a careful job on the tensioner.

Also, you can make your own version of the MB tool for locking the fan clutch by bending an industrial (like you find on coat racks at work) coat hanger to shape. You need something close to 3/16" and these fit well. The manual has a pic of the tool, just copy the bends and you've got the same tool.

HTH,

someguyfromMD