How do we loosen tension on a BMW E39 front window regulator anyway? - Bimmerfest - BMW Forums

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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 10-24-2012, 09:01 PM
bluebee's Avatar
bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Posts: 25,236
Mein Auto: 02 BMW 525i M54 auto 130K
How do we loosen tension on a BMW E39 front window regulator anyway?

EDIT: MatWiz helped us focus on the spring in order to come up with a nearly effortless technique (see post #25, patent pending) which easily loosens & tightens the tremendous cable tension notch by notch.
This almost effortless tensioning method is not documented anywhere else on the Internet to our knowledge!

What is the trick to loosening the tension on a BMW E39 front door window regulator where the cable has jumped off the wheel?

If it's obvious how ... I don't see it.

Here is my 'bench' test apparatus:

And, here is the problem:

Q: What's the procedure for loosening the cable tension to get it back on the last roller?


1) This was the original bmw 2002 525i E39 front driver side window regulator repair DIY
2) This was an update that added the window regulator a year later
3) This is yet another update that attempts to detension the window regulator
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Please read the suggested threads and add value, either by pictures or by descriptions, so the next person stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need

Last edited by bluebee; 11-04-2012 at 09:48 AM.
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