Seamaster Chrono stopwatch minute hand not working

Heatseeker · Apr 12, 2017

Hello everyone

subject says it all, my Seamaster (2225.80.00) doesn't advance the stopwatch minute hand at 12 o'clock after a full revolution of the stopwatch 1/5 seconds hand. The half hour hand at 6 o'clock still works, so does everything else, date, time keeping, etc.
For one that is a stark reminder that I really need to get it serviced (around 6 years old...), but is this to be expected, a known weakness of the 1164 calibre? Any advice?
I also noticed that the helium valve was slightly loose, after I've never opened it and has always been too tightly screwed down to be budged. I hope those two occurrences don't have anything to do with each other...

Archer · Apr 12, 2017

Not a known weakness, so a service should sort it out.

Cheers, Al

Archer · Apr 12, 2017

M.C.B1974
Hi Al,

Could it be caused by the spring on the lock? It doesn't push the intermediate counter into place to engage with the sweeping center wheel?
Best regards

Difficult to understand what parts you are referring to since those are not the proper terms. Nothing gets pushed into place to engage with the central chronograph wheel for the minute counter. There is a finger on the chronograph wheel that flips the minute counter driving wheel, and that wheel in turn flips the minute counter. The minute counter driving wheel is in a fixed position on the plate if that is what you are referring to as the "intermediate counter" so it does not move in to engage with the finger on the chronograph wheel.

Typically if the minute counter is not flipping over the finger on the chronograph wheel has somehow gone out of adjustment (it's a piece of bent steel). It could also be that the minute counter jumper is out of position and jamming the minute counter, but if so I would expect the watch to stop when the minute counter tries to advance.

Here is a video showing the minute counter failing to trip on a 7750 based watch. The finger was bent out of position so although it starts to move the minute counter drive wheel, it doesn't fully flip it over since only the very last bit of the finger contacts the wheel:

Here it is after adjustment - ideally the finger should contact the tooth of the minute counter driving wheel at the midpoint of the flat on the finger as shown. The finger then drives the wheel far enough to flip the counter, and then contacts the subsequent tooth of the drive wheel and pushes it just far enough to take up the backlash between the teeth of the drive wheel and the minute counter - you can see that taken up near the bottom of the screen. So this is perfectly adjusted:

The watch really needs to be looked at in order to fully diagnose the issue, but the finger being bent out of shape would be the most logical scenario given the OP's description of the problem.

Cheers, Al

mr_yossarian · Apr 12, 2017

Heatseeker
..I also noticed that the helium valve was slightly loose, after I've never opened it and has always been too tightly screwed down to be budged. I hope those two occurrences don't have anything to do with each other...

Archer did a thorough analysis already but..
OMG, did you let the Helium out of the watch?? 😀

M.C.B1974 · Apr 12, 2017

Archer
Difficult to understand what parts you are referring to since those are not the proper terms. Nothing gets pushed into place to engage with the central chronograph wheel for the minute counter. There is a finger on the chronograph wheel that flips the minute counter driving wheel, and that wheel in turn flips the minute counter. The minute counter driving wheel is in a fixed position on the plate if that is what you are referring to as the "intermediate counter" so it does not move in to engage with the finger on the chronograph wheel.

Typically if the minute counter is not flipping over the finger on the chronograph wheel has somehow gone out of adjustment (it's a piece of bent steel). It could also be that the minute counter jumper is out of position and jamming the minute counter, but if so I would expect the watch to stop when the minute counter tries to advance.

Here is a video showing the minute counter failing to trip on a 7750 based watch. The finger was bent out of position so although it starts to move the minute counter drive wheel, it doesn't fully flip it over since only the very last bit of the finger contacts the wheel:

Here it is after adjustment - ideally the finger should contact the tooth of the minute counter driving wheel at the midpoint of the flat on the finger as shown. The finger then drives the wheel far enough to flip the counter, and then contacts the subsequent tooth of the drive wheel and pushes it just far enough to take up the backlash between the teeth of the drive wheel and the minute counter - you can see that taken up near the bottom of the screen. So this is perfectly adjusted:

The watch really needs to be looked at in order to fully diagnose the issue, but the finger being bent out of shape would be the most logical scenario given the OP's description of the problem.

Cheers, Al

Hi Al,
|Thanks for the reply, I greatly appreciate it.
I realized what I had said was incorrect and deleted the question. The part I was referring to was the actual brake and I realized that it does not move anything besides it's self when the cam is moved.
That was the other question I was going to ask could it be the finger on the Sweeping seconds counter.
Even my stupid question got a great answer so it helps me a lot.😀
Thanks and best regards

Seamaster Chrono stopwatch minute hand not working

Heatseeker

Archer

Archer

mr_yossarian

M.C.B1974

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