Project Restoration/Build - 1968 Seiko 5126-8100 70m Sports - Seiko & Citizen Watch Forum – Japanese Watch Reviews, Discussion & Trading
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Old 04-18-2019, 09:04 PM   #1 (permalink)
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Default Project Restoration/Build - 1968 Seiko 5126-8100 70m Sports

Following in DonJ53's footsteps, I picked up this very nice 5126-8100 off the SCWF Trading Post from Seiko Hoarder. The watch is in overall excellent condition and comes on its original Seiko 5 Sports bracelet. Upon initial baseline test my Timegrapher showed nothing but snow. A quick run over the demagnetizer and everything was back in order. Initial tests show the watch running around +17 sec/d at 217 amplitude with 1.7 ms beat error. Planning a full tear down and rebuild of the case and movement. Thanks for looking.
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Old 04-19-2019, 01:27 PM   #2 (permalink)
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Dial and hands in excellent condition.
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Old 04-19-2019, 01:28 PM   #3 (permalink)
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Case and bracelet cleaning and refinishing work completed. Waiting on a new crystal and gaskets to assemble.
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Old 04-19-2019, 01:41 PM   #4 (permalink)
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New crystal ? It looks in very good condition.
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Old 04-19-2019, 07:36 PM   #5 (permalink)
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New crystal ? It looks in very good condition.
The crystal is passable but has a few light scratches and nicks. Hard to see in the pics against the dark dial, but they are there. I am sure it could easily be polished out with the right tools. I am going to put in a new one and keep the old one as a backup.

Don - You were not kidding when you said this movement has hundreds of parts and small springs. This one is certainly going to challenge my abilities. Toughest movement I have attempted to service thus far. I took lots of pics. Fingers crossed I can get it all back together. The keyless works alone must have had a dozen parts. An engineering marvel but overly complicated in my opinion.
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Old 04-20-2019, 01:09 AM   #6 (permalink)
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The crystal is passable but has a few light scratches and nicks. Hard to see in the pics against the dark dial, but they are there. I am sure it could easily be polished out with the right tools. I am going to put in a new one and keep the old one as a backup.

Don - You were not kidding when you said this movement has hundreds of parts and small springs. This one is certainly going to challenge my abilities. Toughest movement I have attempted to service thus far. I took lots of pics. Fingers crossed I can get it all back together. The keyless works alone must have had a dozen parts. An engineering marvel but overly complicated in my opinion.



Top tip; don't take the keyless work apart. If it's clean there is no need to
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Old 04-20-2019, 09:34 AM   #7 (permalink)
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Top tip; don't take the keyless work apart. If it's clean there is no need to
Sorry Paul, already apart. As I was disassembling, I kept asking myself what I had I gotten myself into. I took lots of pictures along the way so hopefully I can get it back together. Don did an excellent job of posting sequential pictures of his disassembly and assembly. I will post some pictures of the inner layers of the keyless works as well as the automatic winding mechanism on the motion side in hopes that it will aid others in the future.
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Old 04-20-2019, 02:31 PM   #8 (permalink)
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Top tip; don't take the keyless work apart. If it's clean there is no need to
I see no reason to cut corners, without taking it apart you have no idea what the underside of the parts look like. Many I have taken apart that looked fantastic and found corrosion starting on the hidden side. One spec of corrosion grows and can contaminate the rest of the parts.
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Old 04-20-2019, 02:41 PM   #9 (permalink)
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If you need more pics, here's a slide show I posted of one of mine. The 2nd half is the front side with a piece by piece showing of the keyless assembly.

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Old 04-20-2019, 04:41 PM   #10 (permalink)
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If you need more pics, here's a slide show I posted of one of mine. The 2nd half is the front side with a piece by piece showing of the keyless assembly.

5126 - YouTube
Thanks Zeke. Very helpful.
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Old 04-20-2019, 11:20 PM   #11 (permalink)
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I see no reason to cut corners, without taking it apart you have no idea what the underside of the parts look like. Many I have taken apart that looked fantastic and found corrosion starting on the hidden side. One spec of corrosion grows and can contaminate the rest of the parts.





Not taking keyless work apart is NOT cutting corners.

I have never seen rust under say the set lever that did not have it on the top (I have seen it on the top lots of times when there was none under it).

There is NO good reason to take keyless work apart if it is cleaned well and works fine


Do it if you like of course.....
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Old 04-21-2019, 01:06 AM   #12 (permalink)
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Not taking keyless work apart is NOT cutting corners.

I have never seen rust under say the set lever that did not have it on the top (I have seen it on the top lots of times when there was none under it).

There is NO good reason to take keyless work apart if it is cleaned well and works fine


Do it if you like of course.....
If you don't take it apart then how do you know? Repairing something on what looks good is one thing, but IMO, if you take a watch apart that far to do a full service, there's no reason not to go all the way.
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Old 04-21-2019, 10:10 AM   #13 (permalink)
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So I was messing around last night in my workshop and got to thinking about DonJ53's posts regarding lapping his 5126-8100 crystal with diamond lapping paste and brass nut. While I have ordered a new crystal for my project I thought I would experiment a bit. The crystal on my watch is in decent shape, but has few noticeable light scratches and a number of pock marks visible to the naked eye when viewing the crystal behind a shop light.

In looking at what I had around the shop that might be used for polishing, I found in my Dremel polishing kit a couple of the compound impregnated polishing heads. These are used for light to fine metal polishing and are pretty dense to the touch. They also have a flat head felt surface with no screw or metal protruding through the top. I thought, let me try and see what this would do to my crystal so I set about using various compounds I had for my cars. Polywatch did not do much. I tried some Wolfgangs glass spot removing polish and this worked a bit. I then got more aggressive and tried some Turtle Wax Rubbing Compound I had laying around for removing heavily oxidized paint. Believe it or not, this was working. Using a dab about the size of a dime on the surface of the crystal with the dremel polishing head at low to medium speed working in small concentric circles on the surface of the crystal was actually removing the scratches. I worked on it for about 45 minutes and got the crystal to the point were the optical clarity was excellent with no visible scratches or marks when viewed behind a shop light. When viewing light off the surface of the crystal, I could still see some signs of pocking and scratches but greatly reduced. I am sure with some diamond cutting paste or lapping paste the crystal would come back to near perfect. Just wanted to share this with the group for the DIY set.
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Old 04-23-2019, 05:53 PM   #14 (permalink)
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Making progress. Reassembly.
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Old 04-24-2019, 02:37 AM   #15 (permalink)
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If you don't take it apart then how do you know? Repairing something on what looks good is one thing, but IMO, if you take a watch apart that far to do a full service, there's no reason not to go all the way.





Let's take this to the nth degree shall we?


Push every jewel out in case one is loose, prise off every indice on the dial in case one may get loose in the future, unscrew the crown off the stem.....


A line needs to be drawn occasionally and I draw mine at NOT needlessly pulling apart the keyless work for NO good reason
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Old 04-24-2019, 04:02 AM   #16 (permalink)
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We are talking about parts that are held together by one or two screws and maybe a spring...what's so time consuming about that.
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Old 04-24-2019, 07:40 AM   #17 (permalink)
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Easy enough, Follow the tech manual.
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Old 04-24-2019, 11:33 AM   #18 (permalink)
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Let's take this to the nth degree shall we?


Push every jewel out in case one is loose, prise off every indice on the dial in case one may get loose in the future, unscrew the crown off the stem.....


A line needs to be drawn occasionally and I draw mine at NOT needlessly pulling apart the keyless work for NO good reason
We've been through this before with you, do what you want with your watches, but don't pass along bad advice.
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Old 04-24-2019, 06:35 PM   #19 (permalink)
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Case complete with new crystal and gaskets.
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Old 04-24-2019, 06:50 PM   #20 (permalink)
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that's looks fantastic John. Nice work you are doing ....
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Old 04-24-2019, 07:42 PM   #21 (permalink)
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Old 04-24-2019, 08:13 PM   #22 (permalink)
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I wish I had your skill.

Every time I go beyond changing a crystal or a gasket, I'm in over my head.

I'm lucky to have a professional that knows what he's doing and doesn't charge me an arm and a leg.
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Old 04-24-2019, 08:25 PM   #23 (permalink)
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I wish I had your skill.

Every time I go beyond changing a crystal or a gasket, I'm in over my head.

I'm lucky to have a professional that knows what he's doing and doesn't charge me an arm and a leg.
John - Your watch has found a good home. Thank you for giving me the opportunity to bring it back to its former glory. A very nice example overall. I could not have started with a better piece.
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Old 04-25-2019, 01:09 AM   #24 (permalink)
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Great job.

May I ask, is the cushion a Cousins Value. I must get another cos my cheap ebay Chinese one is so uneven.
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Old 04-25-2019, 01:51 AM   #25 (permalink)
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Great job.

May I ask, is the cushion a Cousins Value. I must get another cos my cheap ebay Chinese one is so uneven.





I use a folded handkerchief (clean-ish)
Wouldn't that be good enough?
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