How to rekey your locks; some experience, a fail, and some questions...

eriknetherlands

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(I think I'll build a DIY from it in due time, but I first want to check some things + I still need one thing solved - see questions to the group below

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My car came to me with 4 different keys. Which worked for me; my car was a real drivers car. But I always wanted to have less hassle, so I actually rekeyed my driver's doorlock to the (original) ignition and glovebox.

Each lock has a code on it. On the door locks they are stamped onto the little actuator. (See pic)

Lock basics:
The locks have 2 rows of 3 pins each. The pins come in 3 different lengths:
4.95 mm, 5.45 mm and 5.98 mm.
(Sorry about the mm's).

Each pin has a corresponding cup; a short pin is matched to a long cup. Thus the cups also come in 3 different lengths: 3.09 mm 2.58 mm and 2.11 mm.
So, the 4.95 pin is matched to the 3.09 cup.
(The measurements of the pins and cups could well be just steps of 0.5 mm eg pins are nominal 5.0 mm 5.5mm and 6.0 mm. Perhaps my pins have worn?)

The pin and cup are pressed into the key with small springs.
A row of 3 holes is beneath each silver pressed plate.
Below a pic of the individual parts.

If you want to re key (rekey?) a lock, it means you have to start by prying off the stainless steel plate with a tiny screwdriver. In a clean and tidy place, where you can easily find the small parts on the floor. Because they will want to jump out. If you keep some pressure on the plate, you can let it pop up a few mm's and release the spring pressure.

The pins have a sharp point that fit into the dimples of the key. The other end of the pin is smooth, and should lie flat with the barrel outer surface. In that way, the pins rotate, while the cups with springs remain in their slot when the lock (the inner barrel) is rotated.

Once you have all the pins, cups, and springs out, you need to figure out what code you need, and then count if you have enough pins and cups of the correct lengths.

The assembly: start with one side.
Insert the 3 pins their respective cups, 3 springs, and place the lid. Bend back whatever is left of the small metal tabs that are left to keep the plate down.
Repeat on the other side.
All locks use the same principle.

to you all:
Question 1: My DIY attempt, about 7 years ago, worked nicely for 4 years. Now, somewhere during the past, one of the stainless steel plates fell off, spilling springs, cups and pins inside the door. So my attempt to lock the stainless plate back by bending the minute edges flat wasn't 100% OK.
- what do other people (keys4classics?) use to reseal these stainless plates? Glue? Metal circular clamp (but must be very thin, as the M24 nut needs to slide over it)?

Question 2: i think i read on the forum somewhere this: who can confirm:
- valet key has 7 dimples, normal keys have 6 dimples. The valet key open all, but not trunk nor glovebox.
Seems counterintuitive to me, as I'd expect the valet key to have one less dimple, thus not activating (opening) pin#7 of the glovebox.
 

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Interesting. I went through that when fixing my E24 door lock. It has five pins on two rows, not 3. My lock has two bearing balls, and I went through 20...

Anyway, the pins have to be symmetrical across rows because the key is symmetrical. That is 10 pins to get right for me. When the lock is cleaned and regreased things work pretty well.

My E9 keys have 7 dimples, so perhaps the one you show with 6 is a valet key?

I always heard the ignition has more pins than the door key, and your lock having three confirms that.
There was another Renault 4 in my building I could open with my key. I assume I could not start it, I may have tried.

A valet key with more dimples does not make sense, that implies it can open more things. Like what?
But then again, I would have to be in a wheelchair before I let a valet park my E9.
 

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great thread Erik - thanks! what i know about lock cylinders (from regular door locks) is that the pins when they drop into the grooves on the key must be flush with the top of the cylinder and have a top pin to keep the lock from turning if the groove is too deep - as well as to avoid jamming the spring into the cylinder.

if one side falls out, then the cylinder is only working off of one side of the key. what you will find is that the holes in the key are symmetrical so no matter which direction you put the key in, it will work - the top of one side is the same as the bottom of the other side and vice versa. you can have any number of pins - the more pins, the harder it is to 'pick'. the trunk probably has more pins, since you don't want the valet to be able to open it. the door + ignition generally has to be the same, so the valet key can do both.
 
Has anyone checked directly with Group Classic if BMW will still provide a lock if you give them the key code? At one time you could do this.

My father had a trunk lock fail in his Bav in 1975. We were travelling so he just had the nearest dealer put another lock in. As a result the trunk has its own key. Wish he had kept the old one for tumbler parts. I've always wanted to re-key it but finding someone that does that would be tough. Some other manufactures had that type of lock. There must a specialist out there somewhere.
 
i will take a spare lock apart sometime this week and see how different the pins are versus typical lock pins. if they are the same or similar, i will see if i can repin the lock. more soon
 
i will take a spare lock apart sometime this week and see how different the pins are versus typical lock pins. if they are the same or similar, i will see if i can repin the lock. more soon
would be great if you could do this.

You mean as in that you could possibly rekey a lock using generic parts, and not necessarily having to slaughter a genuine spare e9 lock to harvest the (possibly) unique pins and cups?
 
Second evening, some more deep diving.
Some handy to know aspects:
- locks have a bottom side; there is one hole that allow debris to exit. It must be pointed downwards.
- The barrel can be disassembled for cleaning, you just need one of those needle note pliers.
- Note that the doorlocks are different in build up when comparing a left to a right version; it is defined by the combined position of the spring+little arm. They do use the identical component, but just the spring+arm are mounted in a position rotated 180 degrees oppositie to each other. That is why the outer barrel has 2 pins that hold the spring ends.

The chrome cap has a little door in it that is spring loaded. These doors sometimes get dislocated; but I can't tell you how to fix it. The chrome cap is pressed on, and through the "debris" exit hole there isn't enough visible to what spring(construction) is inside.
(I don't want the disassemble the pressed on chrome cap - if someone has a lock with a busted cap; i'd be happy to have a go at it. )
 

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Erik, quick question, can you take the cylinder out without having the key? it looks like you can, from the pictures ... that is difficult with most regular locks because the pins keep it from turning. i guess you can remove the side covers and take the pins / springs out.
 
The mounting to the door is done with 3 elements:
a rubber ring pn 51 21 1 814 989 is still available at the dealer. It sits on the outside between chrome cover and body.
Inside is a spring ring and the thin ~M24 nut.
 

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Erik, quick question, can you take the cylinder out without having the key? it looks like you can, from the pictures ... that is difficult with most regular locks because the pins keep it from turning. i guess you can remove the side covers and take the pins / springs out.

Yes, by prying the stainless steel caps off, all the springs, cups and pins will fall out. Then after removing the 2 circlips, the inner barrel can slide out.
I actually never had the keys to the 3 spare locks I bought 10 years ago for fun, one of which is featured above: emptied.
 
The trunk lock is different in mounting construction, but also the function is different. It rotates 90 degrees when a key is inserted, and then it can be pushed in. This is arranged by the white plastic part in the lock; it slides with the inner barrel, but also acts as the outer barrel to catch the pins, and lock the rotation.

The barrel has, besides the normal 2 rows of 3 pins, also 2 even smaller brass stepped pins. They can move up and down about 1 mm, but do not have springs behind them. A small round cylinder less then a mm, pokes into the key's space. They are located so that it contacts the narrow side of the key, not the dimple side. I'm not sure as to their function; perhaps transmitting the load when the trunk is lifted by the vertical key?
 

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The little door for the key to enter the lock on this part was actually loose inside the chrome cap of my spare trunk lock, so I could shake it out. I've wrestled with it for about 1 hour to get it back in, and function as normal, but I did not manage.
The chrome cap is pressed on, like on the door barrels, but I can't figure out a way to 'unbend' the tabs holding the chrome cap tight.

So, my current judgement here is: likely only doable if you grind the folder over tabs off, replace the lid, and glue the chrome cover back on.
 

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This is not a job for the faint of heart or impatient! You can purchase a round sleeve, called a follower, they come in various sizes which assist you in putting the pins back.
 
Thanks for publishing this information, Erik!

What do you suppose the pins and cups are made of? I have a partial ignition lock cylinder from eBay and one cup and spring fell out of it. The cup is very mildly magnetic which makes me think it might be plated with nickel. And the worn end of it has a yellow color so I would suppose it's mostly brass. What are your thoughts? I don't think it would be that hard to make a batch of them on a tiny lathe. I'm a little bit excited to try it.
 
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