My sunroof quit working in my 84 300D while it is fully open. It didn't work this morning when it was closed, but then I tried it about an hour later and it opened fine, but then of course it quit working again. It might be a bad wire connection, but I pulled the switch and everything looks fine. Can I get to the motor with the sunroof fully opened? Thanks,
Andy

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1984 MB 300D Turbo

If the 123 is the same as the 126 then the Sunroof motor is mounted in the trunk. On my SDL it is on the LH side behind the rear wheel arch. There is a special fitting that allows you to crank the sunroof closed manually. It uses a special tool but you can probably find something that will work in it.

Good luck.

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1991 M-B 560SEL Arctic White/Grey 99,000 Miles
1987 M-B 300SDL Ivory/Palomino 229,000 Miles (sold but never forgotten)
2006 Volvo XC70 Blue/Beige
1999 Porsche Boxster Arena Red/Savanna Beige
1986 Porsche 928S Goldweiss/Brown

No, no special tool. 17mm socket IIRC, at least that's what I used for mine and I can't imagine it to be a whole lot different than an '84. You may have to pull the trunk liner to get to it though.
All I had to do to mine when it was stuck was break it free using the emergency cranker in the trunk, and after that it motored on open using the switch. A good idea would be to clean the rails thoroughly with an acid brush and carb cleaner, then lube them with MB sunroof grease ONLY. Only the MB stuff will do.

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'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)

Thanks for the help, although after reading the owners manual, I discovered the manual crank in the trunk. I think I will order some MB grease. Thanks again.
BTW, my sunroof started working again, I think I need to test the switch.
Andy

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1984 MB 300D Turbo