6309 + 7548 In depth Crown Tube Repair - Seiko & Citizen Watch Forum Japanese Watch Reviews, Discussion & Trading
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Old 02-16-2019, 09:03 PM   #1 (permalink)
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Arrow 6309 + 7548 In depth Crown Tube Repair

Well, after a couple of these 6309 crown tube repairs I've somewhat perfected a somewhat simple procedure for this repair. My first repair I did by the seat of my pants so to speak. It was a newly offered repair kit that had been untested so I gave it a go. I did the drilling by hand while holding the case by hand. Did it work? Yes it did but I realized it could be done more accurately supporting the watch case and using a drill press. A more proper procedure.


If you haven't already read about my first attempt you can read about it here:
https://www.thewatchsite.com/21-japa...does-work.html


Now, for a little more in-depth description of what needs to be done to simplify the process you'll need a drill press, a drill press vice, a 3mm drill bit, and some Loctite Red 271 HD thread lock + sealer. You'll start off by correctly positioning the case at the right angle in the vice and directly under the drill bit for drilling.





Proceed with drilling at a low speed while making sure you're drilling at the correct angle.





And presto, the old crown tube is removed.........






Once the old crown tube is removed you'll need to fabricate a tool for installing the new crown tube to the correct depth. You'll need a brass rod of the correct diameter to go through the crown tube. Then you'll need a 6309 or 7548 parts case with a good crown tube to get the measurement you need for marking the brass rod at the correct depth. Basically, you're going to insert the brass rod through the good crown tube until it reaches the other side of the case as shown below. Then you scribe a line around the brass rod at the outer edge of the crown tube. As you can see I've used a 7548 case to fabricate my installation tool but once it's made, the tool will install the crown tube to the correct depth on both cases.







Once you have the brass rod marked at the correct crown tube height you'll need to add a half inch or so from your mark and then cut the brass rod. Then you'll need to insert the brass rod into a pin vise up to your scribed mark and tighten down the pin vice to secure the brass rod in place. Then insert the rod into the known good tube + case assy to check the tool to make sure the rod bottoms out on the opposite side of the case as the pin vise bottoms out on the end of the crown tube as shown below.





Once you've confirmed the tool measurements are correct you insert the new crown stem tube on the brass rod and position it with the cut out in the correct position. If you're unsure of the correct position check your known good watch case for orientation. You'll need to apply the Loctite Red 271 "lightly" to the crown tube bore and the "bore area" on the crown tube. Check your cut-out position on the new tube and insert the new crown tube pressing it into place until the rod bottoms out on the opposite side of the case. Wait 24 hours and you're good to go. Your watch case is now ready for re-assembly.







Once again I've installed a Tried + True UncleSeiko Oyster Bracelet and it's ready for some wrist time........







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Old 02-16-2019, 09:58 PM   #2 (permalink)
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Cousins have generic replacement tubes, that may just fit
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Old 02-16-2019, 10:37 PM   #3 (permalink)
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very nice work. thanks for documenting your process ....
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Old 02-17-2019, 12:04 AM   #4 (permalink)
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Well done Tom and thank you for sharing that
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Old 02-17-2019, 01:15 AM   #5 (permalink)
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Quote:
Originally Posted by bloody watches View Post
Cousins have generic replacement tubes, that may just fit
The 1 to 1 replacement tube and crown are available on ebay
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Old 02-17-2019, 02:36 AM   #6 (permalink)
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Great wright up
Maybe you could share some of those measurements in case members don’t have a spare case
Brass rod diameter and scribe length?
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Old 02-17-2019, 05:28 AM   #7 (permalink)
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Superb!
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Old 02-17-2019, 05:38 AM   #8 (permalink)
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Very well done Tom. Thanks again for sharing the detailed pic's to the forum.

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Old 02-17-2019, 08:01 AM   #9 (permalink)
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Quote:
Originally Posted by lewie View Post
Great wright up
Maybe you could share some of those measurements in case members don’t have a spare case
Brass rod diameter and scribe length?

Thanks guys!


That's a good idea Lewie!


The rod diameter is roughly 1.8mm or .071".


The rod length to scribe is roughly 38mm or 1.50". The rod needs to be longer for the pin vice to secure it.
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Last edited by SeikoPsycho2; 02-17-2019 at 08:04 AM.
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