Question regarding setting the time on 6139/6138 movements - Seiko & Citizen Watch Forum Ė Japanese Watch Reviews, Discussion & Trading
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Old 06-10-2019, 02:50 AM   #1 (permalink)
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Default Question regarding setting the time on 6139/6138 movements

Hello SCWF,

Not sure if this has been discussed before. As I understand that for these 6139/6138 movements, itís best to leave the chrono function running at all times to relieve the stress on the clutch.

Iím not sure if there is a hacking function on these movements, but when i pull the crown out to set the time the sweeping second hand will continue to go. When I turn the crown to set the time backwards (counter clockwise), the sweeping hand on my watch will actually also run backwards for a couple of seconds before resuming to running forward again. That got me wondering if itís OK to set the time backwards for these movements. As I have read that the basic rule of thumb is that you shouldnít set the time backwards if the movement doesnít have hacking function.

Would love to hear what everyone here thinks.

Thanks!


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Old 06-10-2019, 03:05 AM   #2 (permalink)
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Don’t set the time backwards and also have the chronograph stopped at least one day a week. Store it in the running position if not used.

Yes it’s true when stopped the clutch is held but also when the chronograph is stopped the axle of the wheel is stationary and the wheel is then running whereas when chronograph is running the two are in unison. The wheel to axle is lubricated and my personal feeling is it’s a good idea to have the chronograph stopped to allow this to run to keep things running well when stopped.

If you’re picking the watch up and it’s stopped and you want to set the date, advance the time past 4am (ie so you see the day change too) I usually get to around 6am or so before I touch the crown advance. Remember the date and day are changing automatically from around 11pm - 4am this means you’ve got parts of the mechanism in the way of damage if you’re messing with stuff.
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Old 06-10-2019, 03:31 AM   #3 (permalink)
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Quote:
Originally Posted by uncleluck View Post
Donít set the time backwards and also have the chronograph stopped at least one day a week. Store it in the running position if not used.

Yes itís true when stopped the clutch is held but also when the chronograph is stopped the axle of the wheel is stationary and the wheel is then running whereas when chronograph is running the two are in unison. The wheel to axle is lubricated and my personal feeling is itís a good idea to have the chronograph stopped to allow this to run to keep things running well when stopped.

If youíre picking the watch up and itís stopped and you want to set the date, advance the time past 4am (ie so you see the day change too) I usually get to around 6am or so before I touch the crown advance. Remember the date and day are changing automatically from around 11pm - 4am this means youíve got parts of the mechanism in the way of damage if youíre messing with stuff.


Thank you so much for sharing these useful information! Very interesting insight on stopping the chronograph one day a week, TBH I donít quite understand the mechanics behind the reasoning (due to my lack of knowledge), but itís something thatís great to keep in mind for sure. And of course the reminder on the quickset function as well.


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