From digest.v4.n812 Sat Jul 6 17:12:38 1996
From: prreitz_at_amp.com (Paul R. Reitz)
Date: Sat, 6 Jul 1996 19:58:06 -0400
Subject: Re: <E30><Central locking> fixed!!
To follow up on my most recent incorrect post surmising how the key lock
cylinder was supposed to work -
Based on the *snap-switch* theory, I pulled the door apart a third time,
expecting to find a way to make the lock lever stay in the locked postion
when the key was returned to 0 degrees. Instead, I found the lock lever is
(mechanically) forced to return to the neutral position when the key is
returned to 0 degrees. Man, was I stumped!
It was then that I noticed that the key was able to retract *slightly* when
it was rotated 90 degrees. What's this???? I quickly realized that the
driver's door would be double locked if the key could be extracted in this
position, but *none* of the BMW literature - not the owner's manual, not
the ETM, nor the factory shop manual - made mention of this little detail!!
Kinda like being absent from school the day they taught left and right.
I swallowed hard and disassembled the whole lock cylinder right down to the
tumblers and springs. Et viola! Someone had previously *modified* the
lock, interchanging some tumblers (and then grinding them down when they
weren't the right code!!) There's a sneaky subtlety in the width of the
tumblers - a wide one was placed where a narrow one (of the same code)
should have been, and that prevented the key from withdrawing in the
rotated position. Removing the offending tumbler fixed it.
I'm bummed that it took so much time to figure out something that one
little piece of information would have made obvious! On the other hand
side, as my Italian friend Umberto would say, I am somewhat consoled in the
knowledge that this is one problem *I* didn't create!!
So, many thanks to those of you who responded with this critical info, even
if I had just figured it out the hard way.
- --Paul Reitz
BMW CCA #1167
325 iX with a 10 tumbler lock instead of 11 Want to try your key??? Can
you say (1/4)^10? Sure you can...
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