Jump to content

Seiko automatic chronograph 6139-8002

zenon
 Share

Recommended Posts

zenon WRT Addict

zenon

Posted
Posted

Hi,

 

I uncovered in my selection of old stock I got from an auction an automatic Seiko chronograph 6139. I read a little about some problems these watches had, namely the clutch on the centre chronograph wheel and the seconds hand mounting.

I am not sure if my diagnosis is close: while the chronograph is running the watch keeps time pretty well (within a couple of seconds per day worn on hand). Not always, but more often then not, when the chronograph is stopped the watch slowly stops (say it takes 3-4 seconds). When the chronograph is released the watch starts running. The fly back button does the job properly, start/stop/restart button works well. The watch had issues with the hammer click (was too strong - not original hammer spring) but for the time being it is ok.

I did not disassemble the watch yet as I am waiting for the original hammer spring. So this is a little hypothetical/frivolous question: Is there a chance that the (weak spot) centre chronograph wheel needs just cleaning and oil rather then complete replacement? Parts for this movement are scarce and the centre chronograph wheel is unreasonably pricey and the wheel itself - as far as I found out is not serviceable. Any comment will be appreciated.

Regards

ps.

Picture for movement ID.

1970-seiko-chronograph-6139-8002.jpg

Link to comment
Share on other sites
rogart63 Distinguished Member

rogart63

Posted
Posted

Demand gets the price up. Unfortunately a lot of this wheels are broken and they are therefore hard to find. That is why the price is high. 

As for the question if the wheel need to be replaced? Could be that it needs a clean? And that all it needs is to be proberly adjusted. Check the spec how you adjust the chronograph function. 

Is it an A or B movement? The A chronograph is more prone to bad wheels? 

Nice watch btw :) 

https://docs.google.com/viewer?a=v&pid=sites&srcid=Z2xlYXZlYW5kY28uY29tfHRlY2huaWNhbHxneDo1MjlmNzBlMThlMzQwYTUx

  • Like 1
Link to comment
Share on other sites
zenon WRT Addict

zenon

Posted
  • Author
Posted

@ rogart63,

thank you for you comment (optimistic) and the repair manual (how do one find them?). This is the B movement so there is a little more hope. Are there significant differences between A and B?

I did not like the heavy watches before this one. It wears very nicely. It would be good to restore it.


Regards

Link to comment
Share on other sites
rogart63 Distinguished Member

rogart63

Posted
Posted (edited)
11 hours ago, zenon said:

@ rogart63,

thank you for you comment (optimistic) and the repair manual (how do one find them?). This is the B movement so there is a little more hope. Are there significant differences between A and B?

I did not like the heavy watches before this one. It wears very nicely. It would be good to restore it.


Regards

Manuals for Seiko and a few others i usually find here. http://tech.gleaveandco.com/

Difference between A and B is mainly a few springs that looks different and i think the keyless work is different to.

Most parts for A doesn't work in B

Chronograph wheel is different. 

file:///C:/Users/admin/Downloads/Chronoraeder%20888xxx.pdf

Edited by rogart63
  • Like 1
Link to comment
Share on other sites
rogart63 Distinguished Member

rogart63

Posted
Posted

This is what started my morning :( . I  thought i would service this 6139 today. Open it up and found a mismatch off different parts from A and B 

Don't now which parts i need to replace? Or if the owner is willing to take the cost? Would proberbly cost a few £100 . To replace the upper automatic bridge for a B and minute recording wheel. And maybe even the chronograph wheel. Don't now if it's an A or a B 

DSC08310.thumb.JPG.b5cf7522c74798064128c1c8ee758780.JPGDSC08309.thumb.JPG.70ca1339e4adba1493e8512bfcad0832.JPGDSC08308.thumb.JPG.1c68ffaa668829047a0c6f27f382f10a.JPG

 

  • Like 1
Link to comment
Share on other sites
  • 3 weeks later...
 Share
Go to topic listing


  • Similar Content

  • Recently Browsing

    • No registered users viewing this page.

  • Topics

  • Posts

    • nevenbekriev
      Pocket watch escape wh

      By nevenbekriev · Posted

      I will advice to share the idea first here before doeing something to the movement
    • Jon
      Omega cal. 565 - low amplitude

      By Jon · Posted

      When you move the index which changes the timing from an extreme fast to an extreme slow, is there a big change in beat error? Obviously there will be a big change in timing. If there is a big difference in BE then this is strongly inferring the the end-curve of the hairspring isn't set correctly or/and the collet is central to the jewel on the balance cock, because the hairspring that is breathing between the curb pin and boot is being pushed and/or pulled when you move the index from left to right. Also not having the hairspring set correctly can dramatically reduce the amplitude. A quick check is to take power off the movement and move the index from extreme fast to slow and with high magnification see if the hairspring sits nicely between the curb pin and boot at all times (give the balance a spin and watch the hairspring - has it got total freedom?) or if it moves by being pushed or pulled by the curb pin or boot. I'm guessing it is the latter. I think that may be a possibility to your problem.
    • RichardHarris123
      Unbranded skeleton movement

      By RichardHarris123 · Posted

      I can't get windingstens.com to open but you need a  few measurements. 
    • Waggy
      Movement holder made with 3D printer

      By Waggy · Posted

      All Done, Here are the finished pictures: This one shows the generic "one-size-fits-all" base which accepts the bespoke rings - notice that the parametric movement OD (27.40 mm) automatically prints on the ring 🙂 From another angle: Here is the ring about to go into the base: And finally the base and ring together: Here it is next to a pen for scale: On my system with 20% fill each ring will take about 18 mins to print, but I am sure this could be optimised: Here is the screenshot of the spreadsheet in FreeCAD, you just need to change one value to create the ring in cell C3, (the base doesn't need any changes). I just uploaded the files to printables link here, but also include  here as a fake pdf, please change the .pdf to .zip to make the file work once downloaded: Modular Movement Holder.pdf Any feedback welcome!     I'm also going to make a parametric ring insert for rectangular/oval movements - but I just finished a parent teacher evening so too tired now 🙂  
    • Jon
      Tool of the day.

      By Jon · Posted

      I'm going to give that a go next time, thanks for a great idea @rossjackson01 One of my students uses this tool and swears by it https://www.cousinsuk.com/product/wheel-hand-roller-remover-bergeon?code=W1851 which is very like getting two sticks of pegwood under the wheel and rolling them in your fingers so they create a slight prying from underneath motion, I suppose. Maybe bind one end of the two sticks of pegwood so they are like tweezers.
×
×
  • Create New...