Toadhall Books seems to have one:

"Haynes Service & Repair Manual, Mercedes-Benz W124 Series, 1985 to 1993
Aftermarket workshop manual, ideal for do-it-yourselfer, covers 1986-93 300E and other W124 models, gas and diesel. Normal maintenance, minor and major repair, body and engine, includes wiring diagram. Hardbound, 8-1/2x11", 380 pages, hundreds of illustrations. Written for British versions, but you can translate English, right?
MB9797...$24.95 "

See:
<http://www.toadhallbook.com/book.cfm?GI=1&CI=7>

There is also the CD-Manual available at MercedesShop.com (PartsShop).


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Steve
1979 240D
1990 300E