“Project” 6309 !!
The Crown & Stem.
How to refurbish the 5 piece crown and stem system used on the 6309 divers (and others) now that the movement is out of the case we can start looking at the individual parts to asses what we need to do, I decided on this one that as a final test I am going to get it wet (scary ha ha) so I decided rather than a gasket change I would use a OEM NOS crown but use the existing stems/spring and washer.
.As you know the crown is a five piece set up, crown, male stem, female stem, spring and washer.
· Tools needed tweezers, chuck, pin vice, screw lock and Bergeon 6767 (spring bar removal tool).
· First off take the old stem apart, to do this just press the bottom stem onto the spring and slide it side ways tilting it a little at the same time and take great care not to lose the washer which is in between the bottom stem and the spring.
· Then using the pin vice which you have pushed onto the stem as far as you can and tightened it onto the stem, unscrew the stem out of the crown, it is a normal right handed thread. I have managed to undo all the stems from the crowns this way and never had to resort to using heat, it does help if your pin vice is a quality one as it grips the stem good while not damaging it.
· Now that the stem is free from the old crown I use a little (very little) Truloc 360 on the thread, I just squeeze a little out and dip the end of the stem in it, then just screw the stem into the new crown, again I use my pin vice to hold the stem.
· Last but not least reassembly, I now use a small drill chuck I have to hold the new crown and I use some kitchen towel in the jaws just to prevent any marking, fit the spring and now this is the most important part !! I go out in the garden for a smoke LoL Nerves settled so on we go, I now use the forked end of the spring bar tool to compress the spring so that I can place the washer on top of it and over the stem, now at this point be AWARE that if you release the spring the washer will go into orbit more than likely never to be seen again (now you see why I had a smoke first ha ha) I have already placed the bottom part of the stem in the pin vice and now it is just a case of sliding it on to the top section. I would recommend you familiarise your self with how to assemble the two parts without the spring and washer in position so that you understand how it fits together.
Job done, all that’s left to be done is before final assembly insert some silicone into the crown to help form the seal, the silicone also helps the feel of the screw down crown works a little like a lubricant.