Jump to content

Omega Chronostop Problem

Geo

By Geo
in Watch Repairs Help & Advice

 Share

Recommended Posts

Geo Distinguished Member

Geo

Posted
Posted

My recent acquisition from Fleabay was an Omega Chronostop.  Problem was that it was running fast…..very fast, about two hours a day.

 

Thinks to myself, either too much oil or it’s magnetised, either way I recon an easy fix……….wrong!

 

First I degauss the beast, very slight improvement. Ah so it has oil on it as well, OK balance out and washed.  Reassemble, stick on the Timegrapher and we have a result.  Plus 998 seconds a day (Better than two hours).  The graph all over the place shotgun style, and amplitude of 139 degrees…………. Houston we’ve got a problem!

 

Now I decide to have a closer look at things (I should have done that the first time} and I discover that the balance spring is distorted.  It was not parallel with the wheel nor was it on centre. The part of the spring that goes through the guide pins was also twisted…………damn!

 

OK, bight the bullet and buy a new one.  So back onto Ebay and make a very low offer for one, thinking I probably won’t get it and if I do well all’s well.

 

Now I think to myself, let’s take the balance wheel out of the cock and see if I can re-shape it although I was sure that I would not succeed.  Anyway one hour later after an awful lot of fiddling I ended up with a spring that not only looked OK but worked.  Check out the result on the Timergraph!

 

I was well chuffed, then I remembered that I had made an offer on Ebay. I wonder if my offer was accepted, now hoping that it wasn’t.  Would you believe it, it was accepted ……. Sods law! 

 

I will fit the new one when it arrives as I really like the watch and I’m going to totally refurbish the case and fit a genuine Omega crystal………Watch this space!

post-124-0-87195300-1396539095_thumb.jpg

post-124-0-77154900-1396539102_thumb.jpg

post-124-0-64208300-1396539108_thumb.jpg

post-124-0-11945900-1396539114_thumb.jpg

post-124-0-27237200-1396539122_thumb.jpg

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

SeikoWatch

Posted
Posted (edited)

Much oïl ?, no your watch will be too slow and sometime will stop too...your Watch seems to be cleaned or, from what you say, magnetized. if you have not a demagnitizer. a Watch maker can demagnetize it for you :)may be also another problem that I don,t know.

Edited by SeikoWatch
Link to comment
Share on other sites
Geo Distinguished Member

Geo

Posted
  • Author
Posted (edited)

Much oïl ?, no your watch will be too slow and sometime will slow too...your Watch seems to be cleaned or, from what you say, magnetized. if you have not a demagnitizer. a Watch maker can demagnetize it for you :)

Oil on the balance spring will make a watch run fast not slow. I did demagnetise the watch.

Edited by Geo
Link to comment
Share on other sites
 Share
Go to topic listing


  • Recently Browsing

    • No registered users viewing this page.

  • Topics

  • Posts

    • oldhippy
      Stem removal after fitting hands

      By oldhippy · Posted

      I used to just remove the stem pop the movement in its case then put the stem back in check everything then back on the timer. 
    • Neverenoughwatches
      Stem removal after fitting hands

      By Neverenoughwatches · Posted

      That's the right technique Mal 👍 If you are ok with a loupe ( which I'm not ) then pick up the dial in your left hand and make a tripod holder out of 3 fingers and then exactly how Mal and me described with your right hand, press and flick out the stem at the same time. You need three fingers to do this, i use my ring ring finger , sounds like mal uses his little finger, just whatever you feel comfortable with. The key point and dangerous side to this is the tweezers or driver slipping off the release screw. Stablise your left arm by resting your elbow on your bench, so that you can hold the movement horizontally flat, use a x5 loupe to view  and good light so you can see well and have a good tight fitting screwdriver to push the release down. Or as suggested a pusher mounted solid upside-down somewhere then all you need to do is push your movement up to it. I'll rig something up in a bit to show you what i mean. Something like this, but tbh its better to just learn to do with your fingers.
    • Neverenoughwatches
      Leaving the forum for a while.

      By Neverenoughwatches · Posted

      Thanks Michael, shes a real soldier, it would take a tank to knock her off her feet.  Shes surprised even me and i knew she was a tough cookie.  Good for you Michael, you keep at it. I've been reading your posts re. your watchroom they're inspiring and it doesn't matter how long it takes you to get there its about the journey. Rome wasn't built in a day, our watchcaves are our solitudes, our own little empires where we can shut ourselves away from the crap that goes on around us in the world. I look forward to seeing you progress, I have my own ideas how i like to do things. But in answer to your questions on that thread, just let your workspace evolve around you and how you work. You wont figure it out straight away but you will know when to change it and when to leave it alone. But most of all just enjoy it.
    • Malocchio
      Stem removal after fitting hands

      By Malocchio · Posted

      That can be tricky. Sometimes I hold the movement from the edges in left hand and with right hand I push the release with tweezers and simultaneously pull the stem out with right hand pinky or something. 
    • PeterS
      Stem removal after fitting hands

      By PeterS · Posted

      I see what you mean. I must admit I’m not entirely comfortable with that but I can’t see a better method than what you suggest. I’d like to see something like this mirror with a short spike: https://www.cousinsuk.com/product/mirror-for-observing-movements Place it on, push the spike on the post with one hand and release the stem with the other hand. Minor problem, it doesn’t exist.
×
×
  • Create New...