Fix for the GMT Timebomb Movement

[audiwt]

Hi Guys. I have something Special for you. A Friend of me is a Watchmaker in Belgium, and he has produce a fix for the GMT Timebomb Movement. CHS GMT AETA (2824/36)

The Problem at this Movement is this Part. It breaks. And this is the fix. This Part is produced with Germany Qualitysteel and the finishing (curve, trim and vibratory grinding) in his factory in Belgium.

Here is a Video from the fix.

This fix is not for the VR Movement. Only the 2824/36


https://youtu.be/Hco7qTsjam8


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[stufuse]

[mention]ado213 [/mention] [mention]occb2 [/mention]

Looks interesting for sure.

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[philwongnz]

Thanks sharing, isn't the original also made of steel too? Or is the steel your friend is using is at a higher and stronger grade?

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[audiwt]

Thanks sharing, isn't the original also made of steel too? Or is the steel your friend is using is at a higher and stronger grade?

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You are right. The original is in steel, and the fix is stronger and a little bit more solid.


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[KJ2020]

This is good news bro. There is however another point of failure in these movements that can happen even when the jump click does not break.

Reposting from another thread:

There are two points of potential failure in these movements.

1. The jump click spring can break. The spring is located inside the two part GMT wheel, which is held together by the collet. The two halves of the GMT wheel rotate independently if the click spring is intact. If it breaks, the two halves can be epoxied together. It makes no difference if the broken click spring is left inside the GMT wheel for the gluing, although it can act as a containment border for the glue. Once the halves are glued, the GMT and hour hands will be forever synched, but will retain their proper rotation periods (hour hand 2 cycles per 24 hours, GMT hand 1 cycle per 24 hours).

2. The Intermediate Date Wheel (IDW) has no support arm on it in this movement like it does in a native 2836 and 2824. It can get cocked up out of position separately from the click spring breaking. This is due to additional forces placed on it by the datewheel driving wheel around the times of date change (10PM - 2AM). The result is the hour hand becomes stuck or lags behind or is not responsive to crown movements for as long as the IDW is out of position because the hour wheel has become disengaged. Sometimes the IDW will settle back down into position, sometimes not. The potential for this flaw to occur increases when the GMT wheel is glued together because the click spring is not available to absorb any of the pressure exerted on the solid GMT wheel. The fix to this flaw is a custom made IDW support arm fitted underneath the datewheel cover plate.

So, even if you have a spare GMT wheel with an intact click spring, it will not prevent the IDW flaw from occurring. I have fixed that flaw in several of these movements where the click spring never broke. The IDW flaw may never occur, but it is not uncommon.

https://forum.replica-watch.info/fo...-why-the-chs-gmt-movements-are-failing/page10

I've been trying to find someone to produce these IDW support arms in quantity. You did great getting the click springs done, this should help a lot of people get their movements going again!

 

[KJ2020]

Here you can see a normal alignment of the IDW and the hour wheel (which sits atop the GMT wheel), and then a pic of the IDW when it gets displaced. This causes the teeth to skip or disengage altogether.

 

[KJ2020]

You can see at 1:20 in the video how he had to reset the IDW after it was displaced upward. There is nothing to keep this from happening even after the dial is replaced.

 

[stufuse]

[mention]KJ2020 [/mention] So safe to say it’s not a fix, but an improvement instead ?


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[DD60]

Maybe he can make a "fix kit" including the jump click spring and the IDW support arm - all upgraded with a quality stronger steel. The potential is there.

 

[Cadows]

Apple is always the solution....

 

[Rubberman]

Wow, I see this as a cheaper alternative (potential solution/upgrade) for the infamous movement, than replacing it with VR3185 movement.

 

[asanibal]

Interesting

 

[guybythelake]

This an excellent fix. Congratulations, you have done what Noob couldn't / wouldn't do!

 

[Vvvlllooo]

Nice job

 

[TheGarethJones]

I have a good feeling that a “fix kit” or someone advertising their services to do it with such a kit would made a significant impact on the community. I’d be very willing to spend the money, especially since the other option is to buy a winder to make sure I don’t have to set the time to any significant degree anytime soon.


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[MrMac]

Where would one purchase such an item?

 

[DrDrew90]

I too am interested in purchasing. Just got a CHS GMT master on Friday, and the hour jump is already broken. I even followed the directions posted.

 

[KJ2020]

I too am interested in purchasing. Just got a CHS GMT master on Friday, and the hour jump is already broken. I even followed the directions posted.

I would suggest PM the OP. Or maybe some info is available in the video to contact Ben.

 

[Rolex_Master]

Hi Bros

Are there news about buying the fix ?

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[KJ2020]

Hi Bros

Are there news about buying the fix ?

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I'm pretty sure this is the right guy bro.

https://www.bens-uhren.be/