Someone had the whole W123 shop manual (or most of it) on a torrent file. The link is somewhere on this forum.

Here's the CD, showing all the parts and how they fit together:

http://www.mercedesmanuals.com/Mercedes_Benz_W_123_Shop_Manual_p/w123.htm

Instructions are spare and intended for trained mechanics.

I don't get Haynes and Chilton. They spend a third of the book telling how to rebuild the engine, which no typical do-it-yourselfer will ever get close to -- but never stuff like how to effectively pry off the window trim or troubleshoot the vacuum system.

DieselGiant (www.dieselgiant.com) has great free instructions for a lot of common jobs. And even more instructional DVDs for sale.

Also, check out the forum's wiki: http://www.peachparts.com/Wikka/DoItYourSelf

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1995 E320 (2009 - current)
1985 300TD Turbo black (2007-current)
1983 300TD Turbo red (2008-2009)
1972 280SE (2004-2007)
1977 300CD (2003-2004)
1976 240D (1999-2003)