My Adenauer no longer has Mercedes power and I can't offer advice on your problem, however, I do have the owners manual and engine service manual if you would like scans of something in particular. PM me if so.
Btw- the Adenauer chat moved to :
http://autos.groups.yahoo.com/group/3-0-0/
Must join group to chat, but very knowledge bunch there.
Good luck!
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‘84 300TD “Mountain Goat”
'62 300d Adenauer-350 Chevy

- "Max"
'15 VW Passat TDI
'16 Dodge Ram 3500 - Cummins w/6-speed
'68 Mustang fastback
'55 T-bird
‘63 Studebaker Hawk