zombiewolf513

Hey guys. The trunk lock on my s13 broke into pieces the other day, so I tried to repair it using a second lock I had sitting around.

Here is how you can replace your trunk lock (and possibly others) while keeping your key! Basically, we'll be replacing the tumblers from a 'new' lock with the ones from our old lock.

Please read through the whole post before starting!

Here is how to disassemble the locks. Since my old lock was broken, it basically fell apart. The first step is to remove this little c-clip. Put the whole assembly in a plastic bag, so that the clip has nowhere to go if it flies off. Then you can use a screw driver or pliers to work the clip off.



Once you take the clip off, these are the pieces that'll come apart:



The next step is to pry off the small shroud that holds the lock cylinder in the assembly. To do this, I used a small flat-head to bend the areas where the shroud is indented. Be careful, because you'll need to reuse the shroud, and the metal is easy to tear, and the face portion is easy to bend and scratch.



Once you pull the shroud off, you'll be able to remove the lock cylinder (You do NOT need to take off the second shroud with the little keyhole door to continue the swap):



Here is my 'new' lock cylinder versus my old broken one:



Here is how the lock works. The first image shows, without the key, how the tumblers are lifted and dont allow the cylinder to rotate. The second image shows, with the key inserted, how the tumblers align to allow the cylinder to rotate.




Now for the tumbler swap.

This picture shows what the tumblers look like installed:



To do the swap, I did one tumbler at a time from one end to the other to make sure I didn't mix them up. Be careful not to lose any of the tiny little springs that actuate the tumblers.

Using a flat-head, you can press the tumblers out from the end WITHOUT the small round part on the cylinder:





Here's a picture to show the little spring in there:




Again, do one tumbler at a time, from one end to the other. Use the plastic bag trick if you're concerned with losing tiny pieces. Before and during the swap, I sprayed the cylinder parts with WD-40 and wiped them off.

1)Take the bad tumbler out of the 'new' lock, set it aside.

2)Take the good tumbler out of the 'old' lock, clean it up, and install it in the 'new' lock.




After I swapped the tumblers over into the new cylinder, I tested the assembly before reinstalling the shroud. With the key inserted, some of the tumblers were getting hung up on the casing. To fix this and make operation smooth, I used a small file to make very small fillets on the edges of the tumbler:



After that, I cleaned the cylinder with WD-40 again, and put the entire assembly back together just as it came apart. I recommend reforming the shroud piece back into shape before popping it back on, this will give you a better fit than trying to force it back into shape while it's installed.

I hope this helps someone. Good luck!

kashira kureijii

This is cool, good job.
Tech articles are super awesome


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