Date registered: Jul 2006
Vehicle: 1999 E55, 2001 E320, 1990 560 SEC, 2004 ML350, 2001 ML55, 1995 S500, 1998 SL500, 2010 E550 Sport zoo
Location: NW Arkansas, La Jolla CA, Hong Kong
Mentioned: 6 Post(s)
Quoted: 157 Post(s)
I have replaced idler wheel pulley - it's cheap buddy - since you are removing the fan the pulley is a easy job. Sure, pulling shroud clips and tilting works best to pull and reinstall the fan.
Go down to the W210 standard forum, same DIY, just a bit less front space to work with.
It would be foolish NOT to replace the idler pulley - since your old style tensioner shreded the belt (they sheds long way) - and your idler pulley already has serious cracks running fron the inner bearing race to alsmost the outside rim - it's ready to blow soon and with that you will be at square one over one $20/whatever part.
Yes - that idelr pully bolt is like a never ending long one for sure !