I am about to undertake this job on my W124. I bought a Mylie belt tensioner 18 mos ago, and I am now regretting that decision to try to save about $50. I will try to get some photos when I attempt this, hopefully over this weekend, with a Genuine MB part.

To the general forum population: what's the best tool to use to get the fan bolt loose on an OM603, without having to remove the radiator? Sawed off Allen key, mini Allen socket, ?? I went to HF but they didn't seem to have anything that would work. It's an 8 mm, correct?

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech