Omega Seamaster GMT - a warning about used watches

Discussion in 'Omega Watches' started by Archer, Feb 17, 2012.

  1. Archer

    Archer

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    I wanted to show this particular repair, because I found something that could cost you some money if you aren't aware of this.

    I have recently serviced 2 Seamaster GMT's that had an issue with the quick set hour hand function. When the crown was screwed down and then unscrewed, the quick set hour hand on the Cal. 1128 would move. I tried several things to fix this, and the repair ended up being fairly expensive.

    The end result was that two parts had to be replaced - the winding pinion, and the main plate for the movement. While the winding pinion is not an expensive part, the main plate certainly is (couple of hundred dollars).

    So here is a photo of the old winding pinion, next to a new one (new on the left):

    [​IMG]

    You can see on the old one the teeth are a little chewed up when compared to the new one.

    Here are two images I have included in the video below so you can see them clearly. First this is what the worn main plate looked like - note the wear at the two arrows:

    [​IMG]

    And here is what the plate should look like:

    [​IMG]

    Here is a video I made of the problem - the hands, dial, and calendar mechanism were removed, the bare movement was mounted in the case, and this video was shot through the crystal to illustrate what was happening:

    [video=youtube;UZFC-FSJLmc]http://www.youtube.com/watch?v=UZFC-FSJLmc&feature=youtu.be[/video]

    Below is the same description I put on the YouTube link, repeated here for ease of reading:

    This video shows an Omega Seamaster GMT, Ref. 25382000, equipped with a Cal. 1128. When this watch arrived in my shop, when the crown was unscrewed, the quick set hour hand would move. This is not supposed to be the case, and after some investigation it was determined that the main plate of the watch had wear in the setting area due to the winding pinion rubbing there. The winding pinion was in rough shape, and also the stem had been replaced in this watch, and it appeared to be left too long, putting excess pressure on the stem as the crown was screwed down.

    The video shows the worn main plate, what a new plate looks like, and also a demonstration of the initial problem with the dial removed so you can see what's happening in detail. The video starts showing that the winding and setting work fine, and then I begin to screw the crown down. At about 31 second in, you can see the winding pinion get pushed in further towards the center of the movement. This causes the setting mechanism to engage, and as I unscrew the crown you can see that the wheel that would drive the hour wheel is being turned.

    Shortening the stem did not solve this issue, so a new main plate was ordered from Omega, as well as a new winding pinion. The watch worked as it should after these parts were changed.

    So just a caution that if you plan to purchase a used Seamaster GMT, make sure that the quick set hour hand does not move when the crown is unscrewed, or it could mean that you are in for an expensive repair.

    Cheers, Al
    SabrWolf likes this.
  2. SPACE-DWELLER

    SPACE-DWELLER

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    Thanks for the heads up, Al! :thankyou:

    That post of yours can save a LOT of Dollars for potential buyers! :goodpost:

    I'm glad that every thread here turns up on Google and other search engines eventually! :thumbsup:
  3. Baco Noir

    Baco Noir

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    Was my GMT one of the ones affected? :thinking:

    Edit: just heard from Al that mine was not one of them. :yahoo:
  4. Baco Noir

    Baco Noir

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    The winding pinion in the video looked out of round (warped). Having 2 in your shop at once with this problem makes me wonder just how common this problem is? :thinking:


    Btw - thanks for sharing these details. I always love reading the details in your posts. :thumbsup:
  5. Kiwi

    Kiwi

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    Brilliant info, Al:thumbsup:

    Thanks for such a detailed report:yourock:
  6. Pete17

    Pete17

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    Very informative Al, thanks for the heads up.
    Great stuff.

    Sent from my Droid
  7. horologyfan

    horologyfan

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    dear al and others that can help. staying on the topic of a seamaster, i have a SM 300 chrono with the old white writing not the new red writing and the lumes were applied not the ones surrounded by metal. ( i hope you know what i mean apologies for being none technical)

    I bought it certified used from beaverbrooks with the red dot missing and replaced by a blue dot

    i am worried and bothered that the crown only screws in about half a turn and disengages with the same amount of turning. i dont use the watch in water as i am worried that it may affect the water tightness of the watch

    can any one tell me what is wrong with my watch please?
  8. Archer

    Archer

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    The blue dot indicates it's been serviced, but the issue with the crown is the thread on the crown and case tube. It has likely been cross threaded at some point, and the only solution is to replace the crown and case tube.

    Cheers, Al
  9. Archer

    Archer

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    That was the idea Bo - and thanks for embedding the video for me.

    Cheers, Al
  10. Aerome

    Aerome

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    Al, your example unfortunately can be true about all watches on the used market. One can really never know unless it's fresh out of a shop.
  11. horologyfan

    horologyfan

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    hi Al.. can you give me an idea about the work required, how much work will be put into it in-terms of labor and how much will the parts cost. I live in uk and would it be better for me to buy the parts and have it done in my native Philippines?

    please advise as i want to have a100% watch as we all do
  12. Archer

    Archer

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    The crown and case tube would be approx. $50 based on the last set I bought, and labour depends on where you get the work done. The movement has to be removed from the case, the old tube removed, the new tube installed, and the the new crown put on the stem. Then reassembly. Not a huge job, but someone needs to know what they are doing of course.

    I can't really comment on where you should get the work done - sorry.

    Cheers, Al

    Cheers, Al
  13. colemanitis

    colemanitis

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    Good post, Al! :thumbsup:
  14. dongdong8

    dongdong8

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