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In Reply to: You'll need a lock cylinder repair kit posted by JamesM on December 04, 2001 at 14:43:52:
It is possible for the securing clip to come out of the end of the lock barrel, causing the whole barrel to drop out of the door. While it's possible to clean and reassemble all the existing components, the BMW lock repair kit comes with the various springs which restore lock operation to as-new condition. If using new tumblers, bear in mind that these aren't worn - your key/s will be. This caused me a problem (when rebuilding to single-key operation - see below) with the lock sticking. If doing the job again I would try and use the original tumblers but renew the springs, balls and clip.
In my limited experience (twice) the double-locking problem indicates worse to come. Get in there and have a look!
Be warned - assembling the lock barrel with new springs is very fiddly. You need to work out the assembly method in advance or you will have small components flying in all different directions!
When reinstalling the slide/clip onto the locking rod/plunger assembly, use a loop of string or electrical cable around the horizontal rod to tension it/stop it pushing away from you.
If your car has two different locks, (mine had - due to a break-in before my ownership) using a lock repair kit means you can get it back to single-key operation.
The plastic vapour barrier will probably be very brittle and will split easily. Warming with a hair dryer helps. Failing that, it's available through BMW on a big roll though I'm sure it will be available more cheaply elsewhere.
While you're inside the door it's worth spraying some silicon lubricant into the channels. This makes the windows operate faster and more smoothly.
Have an enjoyable afternoon!
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