Speeding up that slow sunroof!
Ok we aren't rebuilding it but they sure can use some work. It shouldn't have to be pushed close or take three tries to get it there, one thing worth mentioning here is that the page was designed for the simple down and under sunroofs rather than the fancier pop up capable design on the W126s.

After putting up with the slow sunroof for quite a while I had enough of pushing it closed, I looked into what causes this and found that it is primarily because people use cheap non-Mercedes slide grease on it. Unfortunately I made this VFAQ shortly after doing my own so I don’t have any pictures of the crud that was left on the upper and lower rails. The grease was so solid it was easier to scrape it off then to clean it off with carburetor cleaner and a rag. Mercedes also has a document on how to remove the sunroof lid, it is on the factory manual as 77-100. I don't think I can stress enough how much the only grease you should use to lube up these tracks is the Mercedes slide grease. Nobody says you have to buy the huge tub, ask your parts supplier, odds are they will sell you a much smaller quantity of grease. It is also used for the latches, seat tracks, and a few other things on the vehicle. As long as your sunroof motor is still good it should be fixable with some new grease.

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Jeff M.
Mercedes W123 DIY pages are now located here.
1983 / 1984 300D Sold
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