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#1
11-17-2020, 10:48 PM
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Gen 1 W126 sunroof not moving smoothly by hand
The sunroof on my 1981 300SD hasn't been moving smoothly over the years. I chalked it up to deferred sunroof maintenance, and finally gave it the first sunroof service it's probably had since it left the factory. I removed the panel and found 2 rubber felt sliding jaws missing, the 2 others caked in old grease, and the plastic sliding jaws and feet caked in old grease. I thoroughly degreased the plastic sliding jaws and feet and sliding rails, replaced all 4 rubber felt sliding jaws, and greased all the sliding jaws and rails with MB Gleitpaste.
I put everything back together and the roof moves very slowly while closing, almost coming to a complete stop. A local MB restoration expert/shop owner/mechanic told me to disconnect the cable and move the sunroof panel back and forth by hand to see if the problem is in the track or in the cable or motor. I disconnected the cable from the panel and it's difficult to move by hand. According to Kent's sunroof video on Youtube, it should glide back and forth easily with one hand while disconnected from the cable, but it's not. So I can eliminate the motor or cable as a culprit. I looked at the sliding rails while moving the panel back and forth and can't see any obstruction. I thought it might be hitting the wind deflector arms and maybe an adjustment of the arms was in order, but I held down the deflector to keep the arms out of the way and it didn't make a difference. Everything looks to be well greased with Gleitpaste. What am I missing?
__________________
'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate Sooner or later every car falls apart, ours does it later! -German Narrator in a MB Promotion Film about the then brand new W123. 
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#2
11-20-2020, 09:53 AM
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There are arms that press outward. Mark the current position so you can go back if necessary. Try moving them in 1 or 2 clicks.
Make sure the rails are perfectly clean then apply a very very little grease. Move the roof back and forth a couple of times then clean the feet again without adding grease. MB makes a "special " paste but I've run out and use silglyde which seems to work. Clean the drains. It will keep you from having to remove the headliner that becomes a bit like a water balloon over your head. If the above doesn't work, look closely at how the thing works and you'll figure it out.
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