Seiko 6309 issue

[graemeW]

I decided it was time to put a new mainspring in my 6309. Serviced the watch while I was at it. Running very nicely. Left it over night, +6 seconds, 0.2ms beat error and 220° amplitude which I gather is ok for this. Pretty consistent in all 6 positions. Happy.

So I start putting the rest of it back together, and when I put the canon pinion back on it stops. Stripped it all down, can't see anything wrong. Pull the pinion and it starts back up.

Train of wheels was super free when checked during service. I just took it back down to just the train and it runs free without the canon pinion but not when it's fitted.

Can't see anything wrong.

I'll keep going over it, and I've checked rebuild videos to make sure I haven't done anything wrong or missed anything, but is there any simple common cause I'm for this?

Watch worked fine before but was loosing 5 mins a day and only had 150 amplitude, hence the new spring.

Edited February 11 by graemeW

[Curare]

Could the minute wheel or date/day wheels be causing the stoppage? that is if they are installed of cause.

Is there end shake when the cannon pinion is fitted to the centre wheel?

Is the clutch wheel in time setting mode?

[graemeW]

28 minutes ago, Curare said:

Could the minute wheel or date/day wheels be causing the stoppage? that is if they are installed of cause.

Is there end shake when the cannon pinion is fitted to the centre wheel?

Is the clutch wheel in time setting mode?

None of the day date stuff is fitted.

Yes to end shake, that's what I don't understand. I just made 100% sure the brass second wheel was fully seated on it's arbor by pressing it on more. Nothing is touching anything and.it all has play where it should.

Not sure what position the stem is in but it shouldn't matter right now.

I took it apart and back together a couple of times. Pulled the pinion on and off a few times and after a few repetitions it decided it wants to work again. Dont think its quite right though.

I'll check it again tomorrow with fresh eyes.

Just checked on it, it's running, but amplitude is down to 120.

Pulling the pinion off makes no difference. I need to go through it again.

So annoying, it was running great. Pinion wasn't even hard to click on.

Edited February 11 by graemeW

[nevenbekriev]

28 minutes ago, graemeW said:

Not sure what position the stem is in but it shouldn't matter right now.

 

Here You are wrong. Put the winding/setting mechanism in winding mode.

[graemeW]

24 minutes ago, nevenbekriev said:

Here You are wrong. Put the winding/setting mechanism in winding mode.

I'll try that.

But I hadn't touched the stem. It was running perfect while I rebuilt the rest of it and it stops/starts depending on if the Pinion was on or not.

My other thought is maybe I've managed to bend the little bridge that holds the second wheel when putting the pinion on.

[graemeW]

Well, lesson learnt! You know what they say about assumption.

Turns out I had put a wrong screw in the dial side that was fouling the barrel. Only slightly, and fitting the pinion must have moved something a little, who knows.

But it's back up and running now.

 

I guess if i can't work out why something is a problem, maybe it's NOT the problem!

Edited February 12 by graemeW