slow windows - PeachParts Mercedes-Benz Forum

JHZR2 · #1 03-10-2010, 05:22 PM

Hello,

my 82 has busted rear regulators. They will go all the way down if I help them up and down a few times in spots where they bind... but that sure indicates to me that something is wrong.

My fronts, however, are just very slow. They work fine, they are just really slow. COntacts on the switch are clean, havent pulled the door skin to check. THat said, the car was a dry weather car, never really seen bad weather, and parts dont show corrosion anyplace else.

Is a slow window a sign of a bad regulator, motor or what on these older cars?

Thanks!

Phil · #2 03-10-2010, 06:25 PM

It's possible that over the years the motor bearings are getting dry and need a little lube.

Biodiesel300TD · #3 03-10-2010, 07:20 PM

I've found that even on the manual windows they just needs some lube when they get slow, or hard to roll up(with the manual windows). Take the door panel off, clean the tracks and lube all the moving parts. Make sure all the pats are tightened up properly. And it will make quite a difference.

79Mercy · #4 03-10-2010, 09:12 PM

This usually happens on coupe window regulators because the arms are so long.

The 2 arms have bent and are hitting each other, usually you can remove the regulator from the car and straighten them out. It will work for a while, but sooner or later you'll need another one.

JHZR2 · #5 03-10-2010, 09:16 PM

They slow down because they are rubbing? I can tell that the rears hit, but the fronts work smooth, just slow.

Is there an improved design for the fronts? The rears are going to cost me $1000 for new ones that are improved...

79Mercy · #6 03-10-2010, 09:19 PM

No the fronts have not been improved they still have the same old part #, they slow down because of being warped and poor lubrication.

hey_allen · #7 03-10-2010, 09:59 PM

I don't know how much similarity there is between the 123 and 126 regulators, but I've found that I got some improvement in my 126 coupe's window regulators after I cleaned all the old dirt contaminated grease off of it and re-lubed it liberally.

I made sure to get the old grease off of the sector gear, the vertical guide rails, and the slide jaws and the rails that they ride in.

79Mercy · #8 03-10-2010, 10:28 PM

W126 front coupe window regulators are exactly the same as W123 front regulators.

JHZR2 · #9 03-11-2010, 01:06 AM

coupe or sedan? Is there a difference?

hey_allen · #10 03-12-2010, 11:33 AM

I know that the 126 coupe and sedan regulators are different from each other.
The coupe front windows are much longer than the sedan ones, and the rears much shorter, aside from the tilting action as the reach the bottom of their travel.

How they compare to the 123 windows, I'm not sure.

JHZR2 · #11 03-12-2010, 01:27 PM

Well, that is the same on a 123, the coupe windows are much longer. Wasnt sure if the regulators stay the same though...

TnBob · #12 03-12-2010, 02:03 PM

And what do our experienced MB DIY'ers recommend for regreasing the tracks ??

JHZR2 · #13 03-12-2010, 03:44 PM

The grease Ive heard is best from automotive engineers is dow molykote 33. I got a big tube for not much from mcmaster. Great stuff.

hey_allen · #14 03-13-2010, 12:56 AM

My not-so-expert choice was a tub of white lithium grease that I had access to when I was working on this project.

If it doesn't hold up too well, I'll re-lube it later with another grease when I tear into it to find out why it's acting up in the future.

tfernandez · #15 03-13-2010, 01:32 AM

is this what could be causing my DS rear window from going down easily? it will stop a little ways down but will work if i put it up a tiny bit and go down the rest of the way. any suggestions on how to bend the metal front on the rear windows too? my passenger rear window has a dent in the metal which stops it from going down more then 4 inches.