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Navitimer 92 power reserve problem
https://breitlingsource.com/phpBB2/viewtopic.php?f=12&t=60754		 Page 1 of 1
Author:  cryo [ Sat Jun 25, 2016 11:19 pm ]
Post subject:  Navitimer 92 power reserve problem
I bought a couple of days ago a Navitimer 92 over ebay, which appears to have an issue with its power reserve (not made known by the seller, and hence a surprise for me)
Basically, after wearing it for half a day or more, it won't hold power until the next morning, when I find it stopped and needing readjustment. Now I know this is a 20+ years watch, so I wouldn't expect the full 42h power reserve it had when new, but still, I think it's reasonable to expect it to be working after a night's sleep.

Service history for the watch was unknown (so it's very likely it wasn't serviced in a decade or so). My question is: how serious and costly would this problem be to fix? Is it a matter of changing the power spring / cleaning it, or it can be a deal breaker? Depends on this, I would be evaluating whether to try to return it or have it fixed.

Thanks!

LE: with the risk of being Cpt. Obvious, the movement is a 2892-A2
Author:  Roffensian [ Sun Jun 26, 2016 3:26 am ]
Post subject:  Re: Navitimer 92 power reserve problem
Did you give it a full wind before wearing? If not I wouldn't expect half a day of wear to give it much power reserve.
Author:  Horologist [ Sun Jun 26, 2016 6:30 am ]
Post subject:  Re: Navitimer 92 power reserve problem
My mistake
Author:  Roffensian [ Sun Jun 26, 2016 6:43 am ]
Post subject:  Re: Navitimer 92 power reserve problem
Horologist wrote:
To test the power reserve try the following, wind the movement at least 75+ turns of the crown....

That's excessive. While you can't overwind an automatic a full wind is 40 turns, anything above that is redundant.
Author:  Horologist [ Sun Jun 26, 2016 6:45 am ]
Post subject:  Re: Navitimer 92 power reserve problem
As above
Author:  Roffensian [ Sun Jun 26, 2016 7:27 am ]
Post subject:  Re: Navitimer 92 power reserve problem
A Breitling modified 2892-A2 which, per Breitling, requires 40 turns.
Author:  Horologist [ Sun Jun 26, 2016 7:29 am ]
Post subject:  Re: Navitimer 92 power reserve problem
As above
Author:  cryo [ Sun Jun 26, 2016 7:08 pm ]
Post subject:  Re: Navitimer 92 power reserve problem
Thanks guys!
After giving it a full winding and then leaving it be, it's still working 20h later. So I guess this was the problem. I have a few other automatics and even if I wear them for a few hours they gather enough energy to last through the night, that's why I was surprised that the Navi didn't. Glad I sorted this out, with your help :)
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