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The Poly-V-belt drive (commonly known as the Serpentine Belt) drives engine components (alternator, AC compressor, etc.) from the engine.
Crankshaft turns clockwise.
6-groove single-belt drive, with AC compressor
- Bosch 1987946046 (length 2390mm)
- Continental ctam 6PK2390 (length 2390mm)
Length: 2335 mm
To remove tension from idler pulley, locate 17mm tensioner bolt located on tensioner bracket (see photo below). Belt obstructs the view so it has to be found by feel. After locating 17mm bolt, push down the bar counter-clockwise (see photo below). When putting the belt back on, it is easier to leave the last part of the belt to slide over the water pump pulley as it has no lip or grooves.
See photo DIY here (S350/S430/S500): http://www.benzworld.org/forums/w220-s-class/1582489-drive-belt-idler-change-photo-diy.html