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Left Drivers Door Lock Repair/Reassembly/

Posted: May 09, 2012 1:23 PM
by geo
Greetings all,

I thought I'd take some time to write up my lock repair. I found a lot of useful information on this topic in this forum, but some of was a little vague as I'm cognitively inept, most times:-)

I've taken some photos and will borrow from already existing. I hope publishers don't mind.

First the list of parts disassembled on the bench (please forgive the lack of parts look up and proper terms) -
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In the above pic we see a list of all the required, removed parts.

Next the Window Track removal -
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This is a must, because you can't get the circlip off the catch without removing it. It's very easy and should go back in place just as easy. Mind the wiring clip, and just pull the wires out from it before removal.

A borrowed picture of the key cylinder in place (this image has a broken catch, but for all intents and purposes, I believe the re/re to repair would be the same regardless) -
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This picture shows the Window Track and how to remove it once the bolt is undone in the step above. The track moves down as you slide it off the rubber, and then away towards the right.

A screw driver angled into the edge of the clip lock heater, near the back of the top arrow in the image, and using the bracket as leverage will get this out. Be careful not to put too much pressure on the bracket as it will break (the bracket holds the actuator switch - don't break it). Before removing the clip lock heater that holds the cylinder in place, make sure you remove the circlip holding the catch below the spring. You'll see the circlip once the window track is out of the way.

Pay close attention to the top and bottom of the track for re-installation, as there are tabs that slides into brackets where the window and track meet. Not hard to spot or to put back, hopefully. The bottom tab by feel - EDIT - Turns out the bottom tab floats. Does not require placement. Window track bolt holds it in place. Just the top tab slips in - EDIT
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Now the catch -
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The catch has a small circlip circled in the picture above. This comes off with a screw driver and is done after you move the window track out of the way. Once the circlip is off, and the clip lock heater is removed, seperate it from the piece it was clipped to, then wiggle the cylinder and catch out the key lock cylinder hole from the outside of the door.

The catch's circlip removal -
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A flat screwdriver will take this clip off and it should also retain it from falling into the car, if you're lucky. If not, grab a magnet and fish. Once the circlip is off, and then the clip lock heater is removed, wiggle the lock out of the hole from the outside of the door, and straighten the catch's spring portion to remove. Wiggle, and jiggle, and angle it out. It'll come out without too much trouble.

The problem in my case -
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The crown, for lack of a better description degraded and eventually caused the flat pin to fall out, releasing the top of the catch rendering the lock inoperable. Of note, the central locking continued to work through the passenger and trunk locks. Just the key in the drivers door would not operate.

The flat pin -
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The flat pin comes out, and should only be removed on the bench with the catch still in place. The flat pin angled tab will break if you bend it too much. The catch has to come off from the circlip at the bottom for this whole procedure in my experience, so wait till the cylinder is on the bench to remove the flat pin. A little force with a flat screwdriver from the opposite end of the tab should suffice to pop it out.

Reassembly is reverse, and I haven't gotten to that point yet. I plan on finishing this write up once I get the crown piece from another forum member, hopefully soon. I wanted to write this up while it was fresh in my mind. It'll get very foggy, quickly. I'll post pics of the completed assembly of the cylinder and catch, but there are plenty of references to that already in this forum.

Job Complete -
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This is how it looks once complete. Notice the position of the flat pin and how the spring ends keep it in place, as well, the spring brings the key back to base.

Reassembly Notes -

- the circlip is tricky, but long needle nose pliers will do the job pretty good.
-the track must be clear of wiring
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I hope this helps other forum members, as these write ups have helped my significantly. Of recent, the OBC light bar LED upgrade was a sinch and happy to be able to see the display.

Cheers,
George

Posted: May 09, 2012 2:52 PM
by ahab
Good write-up George. My E30 has the same problem as yours, the key will sometimes unlock however, just not lock, and I suspect mine is probably worn the same way. In the picture with the flat pin, where is the crown located?

Posted: May 09, 2012 7:10 PM
by geo
ahab wrote:Good write-up George. My E30 has the same problem as yours, the key will sometimes unlock however, just not lock, and I suspect mine is probably worn the same way. In the picture with the flat pin, where is the crown located?
Hi Ahab,

The crown is located on the cylinder. It sits on top, or at the end, before the catch is placed. The flat pin holds it all together. The crown has one position on the cylinder I believe, and the pic below illustrates that hopefully.

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If you notice, the crown will have three tabs that make up the crown part. The two tabs are similar, but the third is a right angle. The right angle locks in place on the cylinder barrel. It's the bottom of the cylinder if it were upright, which has the open side where you can see the spring and code plugs for your specific key. The top of the cylinder/barrel is completely closed. In the image above, the green circles indicate where the crown lines up with the top of the barrel. It should sit flush, as the crown has some small groves on the underside. Be careful with removing the crown, as there are two bearings and springs underneath. Zip lock back is one suggestion I'd agree with when disassembling. Putting them back shouldn't be too hard, as the crown has a whole in it where you can insert spring and bearing, and then rotate to do the other side. You'll see what I mean once/if you have the crown off the barrel.

This orientation should help when assembling the crown, spring and catch to the barrel. In the image above, the spring is missing, but is pretty straight forward. It loads with each point against one of the flat crown tabs, on opposite sides so there's tension - see the "Job Complete" image above. The flat pin then sits between the spring points, allowing the key to return to base, and assume the points also help keep the flat pin put.

I hope that helps.

G

Posted: May 09, 2012 9:24 PM
by stuartinmn
I did the same repair, but I was able to leave the window guide in place - I unbolted the lower end like you did but just pushed the whole assembly to one side. It was tight but I was able to get the lock in and out.

Posted: May 09, 2012 9:45 PM
by John in VA
Figured I'd put this here as it has a good pix and directions.
How to fix the power door lock - from DavidC on the E23 board:
http://www.bimmerboard.com/forums/posts/6271

Posted: May 09, 2012 11:00 PM
by geo
John in VA wrote:Figured I'd put this here as it has a good pix and directions.
How to fix the power door lock - from DavidC on the E23 board:
http://www.bimmerboard.com/forums/posts/6271
Yes, this is what prompted me to do the same, and this was extremely helpful. I found the e28 wasn't as accessible as this pictorial, and I needed that crown piece information in more detail. As well, I found the clamp, or in my case, the lock heater didn't turn 90 degrees and pop off.

I didn't want to reinvent the wheel, but thought a few more details on these specifics might go a little further.

G

Posted: May 09, 2012 11:01 PM
by geo
stuartinmn wrote:I did the same repair, but I was able to leave the window guide in place - I unbolted the lower end like you did but just pushed the whole assembly to one side. It was tight but I was able to get the lock in and out.
I tried, but my hands are wood blocks and couldn't maneuver with it in place. All in all, it was a minor side job to remove, and came on and off with ease - one bolt, the wire clip and it's out.

G

Posted: May 13, 2012 2:00 PM
by Jb88
+1 Thanks Geo! :alright:

Posted: May 20, 2012 1:30 PM
by nik77356
I am needing to do this same repair, and I can't figure out for the life of me, which part the crown is on RealOEM. Does anybody have any insight?

Posted: May 20, 2012 2:35 PM
by geo
nik77356 wrote:I am needing to do this same repair, and I can't figure out for the life of me, which part the crown is on RealOEM. Does anybody have any insight?
It might be -
23 Base ? 51211889499 $1.09

It might be part of the assembly -
29 REPAIR KIT LOCK CYLINDER LEFT 1 01/1985 51219061341 ENDED, See MH 9783111

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Posted: Jul 12, 2012 8:07 AM
by unt0uchable
My door lock just failed EXACTLY like this when I went to unlock it this morning. It was double locked, and I went to the drivers door, turned the key, and it went to the straight up and down position and then it clicked once more and went towards the front of the vehicle and I heard the "pin" drop to the bottom of the door. Now that lock just spins right or left, no operation of the lock cylinder or central locking. Thankfully, the passenger door still works in both aspects.

My question is similar to the one above, what part did you actually replace from the diagram above? Just the "crown" piece? Or also, as you described above, the second to last piece of the 29 REPAIR KIT diagram. Thanks for the help and THANK you for the write up. This post is resulting from a successful search on "driver door lock cylinder".

Posted: Jul 13, 2012 9:49 AM
by geo
unt0uchable wrote:My door lock just failed EXACTLY like this when I went to unlock it this morning. It was double locked, and I went to the drivers door, turned the key, and it went to the straight up and down position and then it clicked once more and went towards the front of the vehicle and I heard the "pin" drop to the bottom of the door. Now that lock just spins right or left, no operation of the lock cylinder or central locking. Thankfully, the passenger door still works in both aspects.

My question is similar to the one above, what part did you actually replace from the diagram above? Just the "crown" piece? Or also, as you described above, the second to last piece of the 29 REPAIR KIT diagram. Thanks for the help and THANK you for the write up. This post is resulting from a successful search on "driver door lock cylinder".
Yes, just the "crown". As I understand it though, the second to last part in the 29 repair kit diagram is the crown piece. I actually didn't really need to replace the crown, but simply slide the flat pin back into the assembly, making sure it stayed put. The pin is what you heard drop, most likely, and is a magnet away from being recovered inside the door.

I hope this helps.

G

Posted: Jul 13, 2012 10:01 AM
by unt0uchable
Thanks for the tip! Did you just source a working lock cylinder and steal the crown from that? That's what I was thinking so I got all proactive and started asking a few folks. Hope I am on the right track.

Thanks again!