Runs only when crown pressed

[Lc130]

Hi All

I'm a beginner having "serviced" about ten watches.  I didn't kill the last five or so.  They were "non runners" that needed a clean and oil.  These were all late '60s early '70s movements.

I'm interested in the one pictured below which appears a bit older.  Description says  that it runs only when pressure applied to the crown.  At this point in my learning,  I can't see the connection.  Any ideas?  

Thank you

Charlie 

 

 

Edited March 25, 2019 by Lc130

[jdrichard]

The gears that move the cannon pinion may be stuck. I would look at the complete winding and setting mechanism.


Sent from my iPhone using Tapatalk Pro

[jguitron]

I agree, the pressure of the stem on the setting mechanism and wheels must release some of the friction built up allowing the movement to run. Maybe gunk... or maybe someone serviced it and messed up the wheels/CP.

As always, the fact that it does run one way or another is a good sign that you should be able to save it.

 

Good luck!!

[Nucejoe]

I agree with JD and Jguitron.   A mulfunction somewhere is set mech and min trian.

The return bar is to bring back the siding pinion( also called castle pinion ,slides pinion on square sect of stem) so to disengage the min train from stem in wind position.  In which case, if you remove the stem, the watch should run. Make sure there is enough wind before removing stem. If no good, the fault is in the min train.

Regards 

[clockboy]

It is a case of strip and inspection.

[vinn3]

11 hours ago, Lc130 said:

Hi All

I'm a beginner having "serviced" about ten watches.  I didn't kill the last five or so.  They were "non runners" that needed a clean and oil.  These were all late '60s early '70s movements.

I'm interested in the one pictured below which appears a bit older.  Description says  that it runs only when pressure applied to the crown.  At this point in my learning,  I can't see the connection.  Any ideas?  

Thank you

Charlie 

 

 

   before jumping into this one,  you should study  a watchmaking book or video.  good luck,  Charlie .  vin

[Lc130]

Thanks Vin,  the last I’ve worked on is AS1700, UTC33 and Seiko 6119.  Thanks to forum help, they’re all apparently working reasonably well.  What should be most aware of with this one?...which I did buy.

Ive learned a lot from Mark’s videos

Thank you

Charlie

Edited March 25, 2019 by Lc130

[Nucejoe]

L C,  I am not sure if I understand the seller correct. runs only if pressure is applied to the crown, 

Dose he mean pressure applied turning the crown like if its fully wound and then some more, or pushing on the crown? Will you clarify on that. I presumed the latter. I think its an AS1188, big chunky movement, sort of a work horse. 

You say old, that darked discolored ebauche would shine like new once you clean it.

I got one, whcih I soaked in kerosene several days and brushed several times, then soaked in paint thinner for ten min and brushed repeated then burnished, looks much cleaner.

 

[Lc130]

Nucejoe,  that’s all he says on eBay.  I’ll report back when it arrives.

 

thank you 

[Nucejoe]

1 hour ago, Lc130 said:

Nucejoe,  that’s all he says on eBay.  I’ll report back when it arrives.

 

thank you 

You make more sense to me than I do to myself.  

[AndyHull]

"Runs when pressure is put on crown."

Could be any of the following (and indeed something else entirely )

1) Turning the crown on its axis as if winding, causes tension on the spring and the watch runs, releasing the crown causes loss of tension, due to broken or missing click spring. Possibly an easy fix.

2) Turning the crown puts pressure on the mechanism, but the main spring is broken, or perhaps just completely filthy, runs erratically for a couple of seconds. Possibly a less easy fix, maybe clean, possibly replace the main spring, but still fixable.

3) Inward pressure on the crown causes the crown to seat correctly, this would cause a hackable movement to start running, but dirt or a damaged seal might then cause the crown to pop back out. Easy fix. Clean stem, crown and keyless work.

4) Inward pressure on the crown causes the keyless work to sit correctly, but a misaligned or broken spring in the keyless work causes it to pop back out when the pressure is removed. Fix.. re-seat or replace the spring in the keyless work. Possibly easy, possibly not.

5) Inward pressure on the crown causes the watch to run, because it has the wrong stem fitted, or has a badly worn, bent or damaged stem, which is binding up the watch, the pressure releases whatever is trapped, allowing the watch to run. Fix.. replace the stem. In my experience any attempt to straighten it will result in it snapping, even if you heat it first. Take pictures of the stem before you attempt any repair.

6) The balance fork is damaged or missing, winding pressure on the stem causes the hands to fly round like a demented politician negotiating an alternative brexit. Fix, replace the balance fork.

7) Something else...

In summary, there is a 99% chance it is fixable.

[HSL]

lol.. that wasn't a small list Andy. I'm sure with a run through like that it will be running like a cup of sooth butter in the desert.
I took a look at a similar Venus i had lying around it had a FHF 284 movement in it, will be interesting to see how this is developing. 

[Nucejoe]

I see,   FHF284 says Dr ranfft. 

Regards 

[saswatch88]

considering this is not a hacking movement i would agree with JD, if it is hacking then the crown is not seated correctly and the watch is hacking......but i will put my money on it that it has a dirty stuck mainspring vert common on these older watches i see all the time, and the seller means putting pressure on the crown as if your trying to wind the watch, that pressure basically forces energy on to the train forcing it to tick, once crown is let go the tension comes off and the watch stops. in this case the mainspring will need to be changed or cleaned, oiled, and re installed.

[Klassiker]

My money is on the mainspring too. You like changing mainsprings, don't you Charlie? I like Andy's option 6 too, bit only because of the comedy.

That is a lovely looking watch. It's going to be a gem once you get it up and running, I'm sure. Quite jealous actually.

[saswatch88]

i love the old school copper gold dials