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Window Regulator Spring Tension


Guy Cocquyt

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You're referring to the large helical spring in the center of the lift mechanism, correct?  If so, it's not under tension when installed.  It tensions when lowering the window to help you crank it back up again.  

 

Did the center pin that holds the spring break or wear out?  It's pot metal and not the strongest thing to hold a large steel spring.  It can be replaced with a ground down bolt and jam nut.  

 

mike

'69 Nevada sunroof-Wolfgang-bought new
'73 Sahara sunroof-Ludwig-since '78
'91 Brillantrot 318is sunroof-Georg Friederich 
Fiat Topolini (Benito & Luigi), Renault 4CVs (Anatole, Lucky Pierre, Brigette) & Kermit, the Bugeye Sprite

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The centre nut has been repaired before. The spring appears to have fallen out as another pivot came apart. I couldn't determine if the spring should have tension when installed or not. You have saved me a lot of grief. [emoji3] thank you!

Sent from my STH100-1 using Tapatalk

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Guy, what's failed on your regulator is that center pivot for the helical spring--and that part isn't available as a spare part.  Drop me an IM and I'll send you the pertinent part of a column I wrote on making a new pivot from a steel bolt--it'll last much longer than the pot metal original.

 

cheers

mike

'69 Nevada sunroof-Wolfgang-bought new
'73 Sahara sunroof-Ludwig-since '78
'91 Brillantrot 318is sunroof-Georg Friederich 
Fiat Topolini (Benito & Luigi), Renault 4CVs (Anatole, Lucky Pierre, Brigette) & Kermit, the Bugeye Sprite

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59 minutes ago, John_in_VA said:

REPAIR KIT - MERCEDES-BENZ (115-586-01-72)

John has some excellent sources for the pivot pins. There are three of those on the window regulator (circled in black in the pic).  The one that holds the spring is different and not available (green arrow in the pic).

 

If you need to replace the spring pivot, then Mike's reference will fix that.

 

If you need to replace any of the other pivot pins, then you can get them from any of John's links.

Window Regulator Pivots (1).jpg

BMWCCA  Member #14493

www.2002sonly.com

1086238739_Logoforsignature.png.eb1354ab9afa7c378cd15f33e4c7fbbe.png

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  • 3 years later...

I came upon this post while searching.

 

I removed the driver door regulator yesterday, and I am missing the spring. All pins, even the center one, looks okay. The old one wasn’t sitting inside the door. The window works as is, but is their a source for the spring?

'74 2002Tii Sienabraun: Henrik

'67 Ford Galaxie 500: Grandpa

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  • 1 year later...
  • 3 weeks later...

Following Mike providing the guide and that tallying with my idea, I set about it. Thought I'd post my doings here for anyone else with the same issue

 

The issue is clearance from the nut to the arm controlling the height of the window. it's very tight! The OE part has clearance as there is nothing sitting on the spring, but here we are trying to use a nut to retain in (I'm not sure you really need one). Mike introducted a jam-nut, a slim profile nut, which is required in this.

 

Take an M8 bolt, slice down the top of it to create space for the tail of the spring. This is fed through the rear of the regulator, through the 'cog' and out the other side to where the spring sits. I found an M8 to be the best size, but the hole in the cog is far too large, so I drilled out some M6 washers to pad it out. There is still some movement, but a lot less. You could probably do better and weld something in, but I can't weld...

 

Once assembled, I threaded the jam nut on and marked where to cut the bolt. This is crucial, 1 thread too much and it'll interact with the arm. Once cut down I re-assembled and used some loctite to help the jam-nut.

 

This is where it's tight. When the window is wound, these 2 are very close images.jpg.8b27655cbffe9386ece3cbff655e2de3.jpg

 

 

Rough sketch.

art.png.1918836377f372b8befe16df6f3e79ab.png

 

66157240-A550-4C1F-89BC-6E5878871978.thumb.jpeg.a8ddc6b16a7132976b876f39f72f96be.jpegC0E1527E-A93C-4290-ACCC-BC775933A0C6.thumb.jpeg.8c666eeb93655f10f2417d08b2ebc1e7.jpeg1985B40A-195E-4BDA-8CDC-80584246ACB6.thumb.jpeg.9dd150141b9bd99f0bee0c0052722661.jpeg

 

 

 

Edited by sam2002
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