New and in need of advice- Orient cal 46941

[GioC]

Hello Watchmakers,

I am a total noob when it comes to watchmaking and I am totally fascinated with it that I want to dive into it. I am in need of advice, as well as, guidance. I have my grandfather’s Orient 3 Star caliber 46941 that as far as I know has never been serviced. It is not running, even after wearing it a full day. So I understand that there maybe issues with it and will know more once I disassemble it and clean it; but I want to acquire some items in advance, that may help me on reassembly. One of them is a new mainspring. I understand that new parts for this caliber may not be able to be found and that I may have to buy a donor movement to assist me, but I will like to get a new mainspring for it, this will mean I will have to buy a generic Swiss ETA mainspring replacement. My problem is that I can’t find info onto what that generic Swiss ETA mainspring replacement model/part number is for this Orient movement . I can’t even find the maintenance/repair manual for the caliber 46941. 

Could someone please provide me with some info, point me to the right direction. I would really appreciate it. 

Thank you all for your time.

[RichardHarris123]

I can find barrels complete but not the actual spring. You can remove the spring and measure it. 

[Nucejoe]

1- Remove the rotor.

2- Gently lift one side of balance rim, balance shouldn't noticably tilt, if it does, a pivot is broken.

3- If no tilt, put a drop of ligher fluid on balance jewel capstones, shake the watch, see if balance turns freely. If you have access to a high torque gear, turn it and see if balance takes off and go.

You are checking/ testing each parts functioning as you disassemble, check end and side shakes ...etc.  By this approach you are fault finding during disassembly. 

Mainsprings are generally replaced with new ones, no so for other parts before knowing which one you need.

Having a donor movement is a good idea in general. 

Commonly folks who unscrew any screw they can see, end up saying " I am at a loss" . 

Rgds

[tomh207]

This movement is on caliber corner, there are a couple of links on the page to service videos which might be useful 

https://calibercorner.com/orient-caliber-46941/

This store has several parts for this movement but I don’t see any mainspring 

https://www.aliexpress.com/store/1103243196?spm=a2g0o.detail.1000061.1.381e3a37Nk0hd6

Tripped over this for a barrel complete 

https://www.watchmaterial.com/orient-46941-barrel-arbor-and-mainspring-2140/

 

otherwise for the mainspring you’ll need to measure it

i don’t think you’ll get a new replacement movement so it’ll be eBay or there are some sellers on Aliexpress who appear to sell these old movements but the translation is a bit iffy.

 

best of luck

 

Tom