Ducman82

New guides, greased tracks... she just does not have the "umph" like she use to. i have to help her forward and up. when up it seals fine. do the motors wear out or just get old? i have a spare (missing the connector) i was going to try and spray some more lube (and check) back by the motor and trans.....

extanker

sure electrical motors get tired. just check voltage/grounds etc and make sure the glass is free to move. any other electrical issues ?drive cables ?how old is the battery ?

jeff spahn

What glass? You have a glass sunroof in your 928? Who made it for you? Links man, links! I want one.

Ducman82

New batt, no other electrical issues. Slow even when the car is running.

928Myles

Have you removed and cleaned and lubricated the cables?

Myles

Kevin in Atlanta

Time to replace it.

Ducman82

i have another, i will give it a shot. clean and greased cables and guides. ill check to see how greased they are. used a little white lithium. maybe not enough...

syoo8

Did you actually remove the cables? My sunroof behaved the same way, it wasn't until I removed the cables, removed old dried gold grease "carcasses" that I had smooth motion restored. (They look like little pieces of acorn, and they are hard.)

Ducman82

yup. took the whole system apart. even used my bore snake to clean the tubes. all is clean. either not enough grease, or the motor hates me. lol

depami

If you have another, start by comparing no-load RPM. And torque, if possible.

DC motors have brushes and a commutator that get dirty and or wear out.

Sometimes you can give it a second life by replacing brushes and resurfacing the commutator.

renbry

I have the same issue - fast as ever to open, on close it slows down sometimes almost to stop !

syoo8

I have had that issue when the sunroof wasn't quite adjusted in the way that it wanted to be.

I just did the sunroof on my 86 (removed the tracks, guides, cable, cleaned everything, then lubricated the cable only.

When I reassembled, everything looked fine cosmetically, but the thing would hardly close. (!)

I disassembled again (and then followed Keith Widom's directions step-by-step.) Voila, now the sunroof closes even faster than it opens.

I hope that helps, I'm sure that you've adjusted it properly, just thought I'd throw that out there.

lonnie77

Could be the four bolts that attach the moving bracket to the hinges are to tight. The two at the rear should be lightly tighten and the two at the front should just touch the metal. Or you need brushes.

Ducman82

do you grease the tracks?

Kevin in Atlanta

Yes you lubricate the tracks. Grease is a mistake. You need a light lubricant that will not cake or accumulate grit. My mechanic used a Mercedes sourced sunroof track lubricant way back. Now I use aerosol based lithium spray.