Jump to content

Modified ETA Movement

Scouseget

By Scouseget
in Watch Repairs Help & Advice

 Share

Recommended Posts

Scouseget Watch Enthusiast

Scouseget

Posted
Posted

Hi all from sunny yet curiously nippy Edmonton.

I have a number of Oris watches, all of which use ETA movements. I made the terrible mistake of dismantling one of these for servicing without sufficiently documenting, or more importantly photographing, it as I was doing so. This watch uses an ETA 2836-2 movement but it's extensively modified as the default design has day and date rings, and a sweep seconds hand. The modified movement that Oris uses does away with the day ring, uses a separate small seconds hand, and uses a sweep date hand. Comparing features it couldn't be much more different from the base design. So what is my question, well it's how do I get hold of a datasheet for the modified design? I've already got an ETA datasheet for the basic design, which is useful for about 75% of the reassembly, but doesn't show any of the extensive mods. Reassembly isn't self-explanatory unfortunately, well at least not for someone with my limited expertise, so what do I do to resolve this problem?

There is of course a moral to this sad tale, namely don't attempt to service a complicated watch without fully documenting the process, and especially photographing every step of the dismantling. And perhaps don't bite off more than you can chew as in build up your expertise with basic movements before taking on anything this complicated. 

Any help you can give with this will be greatly appreciated, especially if you can point me in the right direction regarding getting the correct datasheet. Note I've tried to locate the modified movement datasheet on the internet without success.

Thanks, and merry Christmas everyone.

2836-2 Basic Design.jpg

Oris 2836-2.jpg

Link to comment
Share on other sites
clockboy Distinguished Member

clockboy

Posted
Posted

Agree with Chopin post some pics and maybe we can help. However it will be a good exercise in working out how it re-assembles. I would guess that one of the wheels will be the same as the standard ETA 2836-2 but will have an extended pinion for the seconds hand. The cannon pinion and centre wheel might be different as well to accommodate the extra hand. Looking at Cousins parts list for this movement I notice there are a lot of variants for the cannon pinion, fourth & third wheels.

Link to comment
Share on other sites
 Share
Go to topic listing


  • Recently Browsing

    • No registered users viewing this page.

  • Topics

  • Posts

    • watchweasol
      Chronograph Pusher Rod for EB8371-67 Snapped and Stuck in Button. Can't Unscrew.

      By watchweasol · Posted

      Hi. Yes I get it , the slot in the end I’d to allow you to screw the button on whilst holding the pusher shaft. To remove the pusher tube you will need a tool such as the one shown by Richard. I think Ali Express the Chinese Amazon has replicas of the Horotec system for a lot less money, how effective they are not having had to use one. But as you said the way to go is complete removal and replacement, bodging it up will  lead to a repeat failure
    • JohnR725
      Notifications

      By JohnR725 · Posted

      It does look like it seems to be working again I'm getting emails.
    • JohnR725
      30T2 adjustment of timing washers

      By JohnR725 · Posted

      One of the things that I've been bothered with lately is timekeeping? For instance a 90-year-old pocket watch what so to timekeeping was it supposed to keep? They publish railroad timekeeping but I don't know how well normal non-railroad watches were supposed to keep time. The reason why the question comes up for me is I spend a lot of time at work adjusting watches to keep really really good time  because I have to please my boss where as when the watch was made I have to wonder what kind timekeeping would've been acceptable. After all they typically didn't have timing machines 100 years ago and they were timing and six positions certainly not for the non-railroad grade watch. On the other hand I do get paid by the hour so maybe I shouldn't be concerned of how much time I Spend trying to make everything keep chronometer timekeeping almost. Citing a Delta of 40 seconds for a 90-year-old watch is quite outstanding.
    • JohnR725
      Is this pallet fork over-locking?

      By JohnR725 · Posted

      That's an interesting question which I don't think I've seen explained anywhere. But I think the problem will go away just about instantaneously. In other words the  coating is really thin and it should go away almost immediately. So the problem should resolve itself extremely fast.  
    • VWatchie
      Is this pallet fork over-locking?

      By VWatchie · Posted

      I experienced that different types of shellac and their ages are affected differently by IPA. Sometimes the shellac dissolves in a few seconds and sometimes several minutes are required. Nowadays I never let shellac come into contact with IPA. It's a hotly debated topic here on WRT if you search. Like John, I don't think you need to worry about the weight of the shellac, but instead that it might start rubbing against something. When I learned how to adjust pallet stones, I tried documenting my experiences in this thread. Hopefully, it can help you. I personally don't believe in the idea of abrading the epilame before oiling so I don't think you need to think or worry about it. The only time I've heard anyone mention this is Alex on the YouTube channel Watch Repair Tutorials but actually no one else. I'm not saying it's "wrong" just that I don't think it's necessary or adds anything.
×
×
  • Create New...