how to get that piece out?

[xam7]

hello

maybe someone can help me get the piece out of the casing...i have remove every screw i could find 

[nickelsilver]

It's normally attached to the movement and comes out with the movement. It's likely stuck due to all the rust. There are chronographs where the movement comes out the dial side, but there's about a 0.000001% chance that's the case here. You will need to gently try to lever it out.

[xam7]

i try pushing it gently in the front but it did not move at all,i'm thinking of using wd40 to loose it a bit from the rust...

there's this like pressure valve with a screw on the side but i don't think it hold the piece at all

Edited March 1, 2023 by xam7

[spectre6000]

It's rusted in. You need to dissolve the rust. Unfortunately, that could be pretty rough on the dial... 

If it were me, I'd get some Evaporust or similar, put a small amount* in a vessel, and stand the watch up at an angle such that the dial is out, but the plate is in (*the small amount is precisely metered to meet this mark). [EDIT] I'd start with the lowest parts, work my way around those, then add little by little until I've derusted the section corresponding to the thickest section of case at the lugs.[/EDIT] Then, I'd rinse with IPA, rotate, and get the next small section. With any luck, by the time you make the full circle, you'll be able to pop it out with a little prying.

Disclaimer: This is what I would do, and I'm likely not the best resource for such a debacle.

Edited March 1, 2023 by spectre6000

[xam7]

thank you for your inpout ,that's what il do

have a nice day

[xam7]

i finally got it out after much gentle work and a bath into the ionic cleaner,i had no choices

i will wait after the bunch of tools that i order before doing anything further ...looks like there's a lot of rust inside.

in the mean time i'm starting the polishing of the case,i love polishing metal like stainless steel

any advice on the next step of this restoration always welcome

thanks to all of you

[spectre6000]

It sounds like this might be your first rodeo. The chronograph section of that movement looks more than just rough... I imagine that's a 7750, which is hardly a rare movement, but you'll be in it for nearly a movement's worth of spares just from the rust. Newbie mistakes will cost you quite a few more. If I were in your shoes, I might consider either putting it aside until you have a few more notches on your belt, or not really worrying too much about servicing the movement, and focus more on tracking down a replacement. Just clean up the case, and swap the hands and dial. That'll still be plenty of learning curve, but with far better odds of success.