Second Hand Moves, Minute Hand Doesn't... for ~10 Minutes

[SethL]

I have a rather odd issue on a vintage watch I purchased (Talis). It sets fine, winds fine, and runs. However, only the second hand runs for the first ~10 minutes or so after setting. Then the minute & hour hand kick in and it keeps good time for a long while (albeit 10 minutes slow). My best guess is a loose cannon pinion, but it seems odd that it would only be loose for a little bit, and only after setting. I've taken the pinion off, tried to clean any excess oil (none seen), but the issue remains.

My next course of action is a full clean and oil, but wanted to know if anyone had any ideas or something else I should be looking at.

Many thanks,
Seth

[matabog]

That is a weird one! Would be some sort of too much play in the pinions... or the canon pinion... 

Or a pinion in the train wheel maybe got loose on its wheel...

 

[rodabod]

It's a pain, but I'd take the dial off and observe the motion works. One tooth of a pinion slipping could easily lose minutes. 

[Folkvisor]

Is the second hand separate? 

[SethL]

2 hours ago, Folkvisor said:

Is the second hand separate? 

Yes, I should have mentioned: it's a sub second hand.

[Folkvisor]

Does the watch set properly? If it's loose and difficult to set I'd look at the cannon pinion.

had a loose cannon pinion on a movement and it was behaving much the same way as you describe so I think that may be the issue. If so, you have to tighten it. I think there are videos covering this procedure.

 

 

[SethL]

1 hour ago, Folkvisor said:

Does the watch set properly? If it's loose and difficult to set I'd look at the cannon pinion.

had a loose cannon pinion on a movement and it was behaving much the same way as you describe so I think that may be the issue. If so, you have to tighten it. I think there are videos covering this procedure.

 

 

It sets just fine. Easier than most of my watches, but not overly loose.

But I'm guessing it's a loose cannon pinion, too. Probably going to disassemble and clean, because I need to anyways, and also check for anything else odd. If after that it's doing the same thing, I guess I'm going to learn how to tighten a cannon pinion. Will update here with results.

Thanks all.

[Folkvisor]

It's easiest with a staking tool. I've found you have to hit it a lot harder than you'd think necessary to make it tighter.