Jump to content

Refitting crystal on Omega 166.041

Ascanio
 Share

Recommended Posts

Ascanio Member

Ascanio

Posted
Posted

Hi

I am trying to place a new crystal on an Omega 166.041 case. Original crystal is no more available.

Measurement internal is 31.45 mm

I sourced on Cousins a not original replacement crystal for the movement, the site recommended part code G22740 which is reported 31.60 mm diameter and 4.10 mm height

My surprise is that if I measure the crystal is in fact 31.60 mm but if I measure it at the very base where is the tension ring it is just 31.35 mm

So, once I place the crystal on the case, it drops in and there is nothing to push in place!

What am I doing wrong? Or just the crystal is not doing it's job? Is any seal needed? Shall I have to purchase an original PX5005 or maybe I can have more luck with a lower profile 3.85 mm part code G22742 ?

Help me please! It's my very first crystal refitting so no experience... 

Bonus question: Will I have any chance pressing the crystal by hand or should I really invest in a crystal press?

Thank you!!

Link to comment
Share on other sites
MrRoundel Super WRT Addict

MrRoundel

Posted
Posted

Are you getting your measurements from the case or old crystal? If the crystal is dropping to the bottom of the recess in the bezel, it's obviously too small. Not much I can figure to do to stretch it. In the GS crystals, I see that there is one shown for an Omega waterproof that is 31.70mm.  It is a PA468, which is for a case that uses a reflector ring, not a tension ring. Fitting crystals to vintage pieces isn't easy sometimes. Good luck.

Link to comment
Share on other sites
Ascanio Member

Ascanio

Posted
  • Author
Posted

Thanks for the answer. I am measuring 31.45 mm in the case recess.

What i think is not normal is the crystal i purchased to being smaller in bottom ring (31.35 mm) compared its overall and avvertised diameter of 31.60 mm, but since it comes with a perfectly fitting tension ring at 31.35, i wonder...


Inviato dal mio iPhone utilizzando Tapatalk

Link to comment
Share on other sites
MrRoundel Super WRT Addict

MrRoundel

Posted
Posted

GS fitting instructions say not to exceed one-half GS size, which is two steps in their catalog. My list shows that if the bezel measures 31.4mm, you can go up to 31.7mm. Yours measures a GS size of 31.4~, which is GS #29 1/2. Skipping 29 3/4, you get to 30, which measures 31.7mm. Sounds like good bet to me. Others may know differently, but it looks good to me. Good luck.

 

 

Link to comment
Share on other sites
  • 3 years later...
JohnR725 Distinguished Member

JohnR725

Posted
Posted
1 hour ago, swiss2k said:

Hi. Found this topic while searching for a crystal myself. And I think the right one is PZ 5005, 31.7mm. Hope this information would be helpful for someone. 

Thank you.

I suspect the crisis is over as the conversation was three years ago

one of the problems with omega case numbers are there not super specific. for instance if you look up the case number you find two separate crystals the 063PZ5005 for the stainless steel case and the listing below for the yellow gold plated case I know on one particular instance I saw four separate cases for one number and there are some crystal variations because of that specifically in size but both of these appear to be identical in size

063PX5005
063 DIAMETER D1 :
31.62 MM
063 EYEGLASS :
WIHTOUT
063 HEIGHT TOTAL H1 :
4.60 MM
063 PROFILE :
CONCAVE
063 SHAPE :
ROUND
063 TYPE :
ETANCHE
DIAM OF THE GLASS SEATING D2 :
31.50 MM

 

  • Thanks 1
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
 Share
Go to topic listing


  • Recently Browsing

    • No registered users viewing this page.

  • Topics

  • Posts

    • GuyMontag
      Movement holder made with 3D printer

      By GuyMontag · Posted

      I missed this earlier. The dial isn't going into the holder, it should sit proud of it. This is what I am currently using which I print for each different movement.    
    • Neverenoughwatches
      Setting lever spring

      By Neverenoughwatches · Posted

      I didn't think pulling to set position would work harden the spring, in that position it is stressed where the arm starts. By work hardening i meant rapid polishing at that point, a bit like polishing a pivot work hardens as it compresses the steel. I doubt polishing by hand would achieve much in that respect though. Its finished, arm polished up mostly at the join to the bridge's main body. I'm ok with it, the screw holes aren't great as i had to open them up by redrilling and positioning it was difficult, I'm not much use with a loupe, opening up with a file might be a better option for me or i could just use the correct drill size 😅. And the detent is way too deep, i had to guess that with the stem release out of position and sat on top, but i only took one measure and went for it, no slowly slowly catch your monkey 😅. First go I'm happy , well sort of, it works and thats a big thing for me, next one will have a bit more finesse.  Anyone thats interested, after filing, i used a 2000 grade home made diamond  micro file and then 20 micron film, the film is much better than wet and dry, more stable to use and doesn't shed cheap grade grit everywhere , then auto polish on a sponge pad.
    • RichardHarris123
      Setting lever spring

      By RichardHarris123 · Posted

      I'm assuming that every time you set the watch you are work hardening the detent spring, maximum hardening is  where it meets the plate due to maximum deflection.   That's why it snaps there.  The Young's modulus may be the same but after it's reached its maximum yeid strength it breaks.  My mechanic engineering is very rusty, correct me if I'm wrong. 
    • Neverenoughwatches
      Setting lever spring

      By Neverenoughwatches · Posted

      Ah ok yes that makes sense to polish it where the arm starts to form from the body of the bridge, i thought you meant the underneath of all the arm.
    • JohnR725
      Epilame / Fixodrop

      By JohnR725 · Posted

      this is something I've never quite understood about the some of the Swiss companies. In 1957 Omega was using 9010 for the keyless parts with epilam. there's been a slow migration towards using heavier lubrication's but still typically oils and epilam to keep them in place. When it seems like 9504 works so much better.  
×
×
  • Create New...