Since no one has a DIY on the replacement of our sepentine belt ( not that I know of) I will give everyone a review of how I did it this morning.


First, we have limited space to get to the belt as we are blocked off by the intake hose and you would have to remove it but their are two clamps the easy one that clamps to the intake and another clamp buried on passenger side, and in my case, unattainable from the top. If you can get to the screw/bolt on the clamp from the top that is another option. However, In my case I found the clamp bolt angled downward when I removed the lower splash shields.



So first thing is to get car up on ramps. Then remove the lower splash shields. Remove the two front shields ( labeled 1 and 4 in picture). Some 8 mm bolts and your done.




IMPORTANT: Get a good look at how your belt wraps around each pully.
Where the groves of the belt contact and where the smooth surface contacts. Study the diagram and your car. When you are ready proceed.

Here was my C250 pulley configuration:


Locate belt tensioner pulley:
See that Torx/star pattern ....you will need a big boy T60.


Buy the set you will need it on this car:
http://www.autozone.com/screwdrivers...set/704328_0_0

I own a serpentine belt tool already but if you dont have one you will have to struggle with clearance and leverage issues. I purchased this exact one a couple years ago and it makes changine belts allot easier:

You will also need a socket wrench extension.


Pull towards the drivers side from underneath and unloop the belt from the tensioner pulley etc and then remove the entire belt. Without tension it comes off fairly easily.

Now go from the top and slip it over all the pullies except this one.


Use your T60 extension and belt removal tool again and pull towards the driver side- again.

Slip the belt over the last pully above. Keep pulling tell you can slip it over...

Important: Double check that the belt is lined up correctly and on the groves of each pully and not unalined or even off a pully. Double check before you start the car!

Your done.

 

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At what mileage do you need you change the belt? Nice write up. Thanks

 

Maintenance Booklet shows to check the belt every two years. I own a 370z and we change them out every 2 to 4 years... My Mercedes is 4 years old and its a keeper so I figured why not change it out!
Honestly the old belt looked fine, but I have only 17k miles on my car. Better safe then sorry !