Setting Problem

[spiro13]

Hi

I have a Bulova 10BNCH with a setting problem. When the movement is out of the case it winds, sets, and hacks properly. When it is assembled in the case the stem, the stem pulls out when trying to set it. Parts have been replaced from another watch but the problem remains. I would appreciate suggestions to solve this problem.

Thank you,

Tony

 

[Nucejoe]

Set lever pin is not properly dropped in stem groove. 

 

[WatchMaker]

What should happen is that when you push the stem into a movement, and tighten down the setting lever screw, you're basically moving the setting lever into position such that, as @Nucejoe says, the 'pin' on the setting lever locks into position in the groove in the stem.

You say everything is fine when the movement is out of the case; this only happens when you try and re-case. This therefore sounds like the stem is too short ... or that there is some obstruction (e.g. dirt in the crown) that is stopping it pushing in fully. If the stem is not far enough into the movement then when you screw the setting lever into position the pin will not engage with the stem and it will subsequently pull straight out when you try and use it as you're finding! 

Is this the original stem/crown that came with the movement and case or is this one of the replacements you mention? If it is the original then first check there is nothing in the crown that might be causing a slight obstruction. Now with the movement out of the case engage the stem and check the setting works as expected. Pull the stem into the setting position before unscrewing the setting lever screw just enough to remove the stem. Recase the movement and push the stem/crown in and ensure it is properly engaged before tightening down the setting lever screw. [Conversely if it is not the original stem then it sounds like it could be fractionally short and not going into the movement enough ... come back if this is the case for more advice!].

[spiro13]

Thanks. I will be reassembling the watch following you advice.

 

Tony