omega 565

[gary17]

Hey

Been working on a 0mega cal 565, case number 166.026 for a few months rebuilding one from 3 scrap 565s and 1 562. after a lot of  searching i have finaly found a proper omega crystal (pz5123)

The crystal is a tight squeeze but fits. Only thing now is it will not stay in position.Unfortunately i dont have the correct gaskets. Is this what enables them to stay in place? Also i seem to remember blowing through a straw via the winding stem hole when removing the old glass.Do i need to make it a vacuum inside?

And if so suggestions please.

cheers

gary

[watchweasol]

Hi Gary   Blowing in through the stem is a no no as you are introducing moisture , Th normal thing to do ia use a syringe to increase the pressure in the case to blow out the crystal, Done when getting the movement out of a front loader,    You say the crystal fits but won't stay in position, in what way , does it pop out again .  There is no way you will get a vacuum in a watch case due to the stem and as far as i know. If you did manage to get a vacuum in a case you would have a hell of a job getting it apart without releasing the Vacuum 

[HSL]

Blowing the crystal of with a straw would take a set of lungs I don't have. One use a pump or some might use a larger syringe.
But the problem you seem to have is the crystal you got might got the sides shaved of a bit when pushed back in so it now is slightly too small.
On a for example Omega Seamaster with a case like this I would use an acrylic crystal with a tension ring, the tension ring gives that little extra to keep it in place.

I see you used the right crystal PZ 5123 32.95mm, so something has happened to it..

Edited May 17, 2020 by HSL

[gary17]

Hey

yer it has the tension ring. Does that come away from the crystal?

It is ever so slightly to big (the crystal with ring on it).

Not even a mm in it.

Last time i fitted a crystal though i shattered it.

And that was with a crystal fitting machine.

so do not want to be doing that again.

cheers

gary

 

Oh yer i dont really no how this crystal pusher works. I just pic a concave die that fits roughly the size of the crystal and solid die for the base and then tighten.

So yer can see why i am nervous.

Quite a few people on this forum helped me trace down this crystal. finally ended in sweeden.

so want to do it justice.

[HSL]

I thought I saw a video a while ago from esslinger that amused me a bit, they show how to press in a crystal with a tensionring except the tensionring is still on the bench, but the process gives you an example of how it's done , as you see he uses the dies with a straighter edge which will compress the acryllic crystal from the sides. this will minimize the risk from cracking the crystal as if you try to push it in with the angular parts. 
The compression will make the tension ring shrink a bit and the crystal will slip on like a glove, if the crystal wasn't just a tad to large it would not resist water or dust coming into the case.