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Oris Centennial - Uncasing

steven

By steven
in Watch Repairs Help & Advice

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steven WRT Addict

steven

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Hi guys, I just received this Oris Centennial with a loose second hand. But I can't get to uncase it to fix the hand. Hope someone can help with some instructions to uncase it.

The movement with the dial doesn't seem to be able to come out through back as the dial is bigger than the back opening.

It seems the only way is through the front. I've tried to remove the glass using the pump method but failed. Is there any other proper method to remove the glass?

Thanks in advance.

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bobm12 Distinguished Member

bobm12

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Maybe it is the bezel you need to lift/remove if dial is bigger as you said...or the movement -- or retaining ring -- rotates to get free of the case if actual dial is smaller (if retaining ring, it may lift)...I can't tell in the picture what looks bigger but it is maybe because there is (looks like there is, can't tell from my computer) a chapter ring there? If so, the chapter ring is giving the impression of a bigger dial when in reality everything should go out the back...not very clear from my end...my screen sucks!

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steven WRT Addict

steven

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Thanks for the suggestions, guys. There's no chapter ring and no movement ring. I am sure it's a front loader. The problem is how to get the crystal off. It's friction fit with white plastic gasket. The metal case is one piece. Wonder why it's designed like this.

Sent from my iPad using Tapatalk

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jdm Distinguished Member

jdm

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Thanks for the suggestions, guys. There's no chapter ring and no movement ring. I am sure it's a front loader. The problem is how to get the crystal off. It's friction fit with white plastic gasket. The metal case is one piece. Wonder why it's designed like this.

Because to manufacture a large watch using an economical, easily available, normal size movement, either use a chapter ring, or make a front loader.

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PeterGe WRT Addict

PeterGe

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An other way is to use air.

Instead of using a crystal lift you can pump in air via the case tube.

Bergeon has a special pump for this but there are other ways.

I believe Mark uses a syringe in one of his videos.

 

Just make sure to put your thumb on the crystal so it doesn't fly away.

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Peixian Watch Enthusiast

Peixian

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An other way is to use air.

Instead of using a crystal lift you can pump in air via the case tube.

Bergeon has a special pump for this but there are other ways.

I believe Mark uses a syringe in one of his videos.

 

Just make sure to put your thumb on the crystal so it doesn't fly away.

:thumbsu:  that is s good idea

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steven WRT Addict

steven

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Peter, yesterday I was using this Bergeon pump but the crystal just won't come off the case. I will try again today after soaking the rim of the crystal and the gasket with some oil. I hope WD40 will do the job.

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jdm Distinguished Member

jdm

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I will try again today after soaking the rim of the crystal and the gasket with some oil. I hope WD40 will do the job.

WD40 (which is a water repellent, not an oil) will do absolutely nothing in terms of preventing pressure air to flow, but if you place it around the crystal it may find a way to get to the dial and stain it.

I think you should use a suction tool to remove the glass. Esssingler sells both the original Bergeon and the knock-off.

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PeterGe WRT Addict

PeterGe

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On 24-3-2016 at 10:27 AM, steven said:

0fd3661f59be587077ab140e0793e4fd.jpg

Peter, yesterday I was using this Bergeon pump but the crystal just won't come off the case. I will try again today after soaking the rim of the crystal and the gasket with some oil. I hope WD40 will do the job.

Sent from my iPad using Tapatalk

I do not own such a bergeon pump. I use an air compressor :-) I have made pieces in nylon to fit on the case tube. You can generate morge pressure that way. But normally that bergeon pump should do the trick.

 

In the very end, if all other fail, you can break the glas, remove it, put the hand back & put a new crystal.

But that should really be a last resort ;-)

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steven WRT Addict

steven

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Few days ago I came up with the idea of using the waterproof tester's pump. So i bought a meter of 6mm water filter hose and attached it to the air input tube of the water tester.

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While I hold the end of the hose to the pendant tube, my assistant pump up the pressure. We managed to hit the max pressure of 6 bar.

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The glass at the display case back shattered.

The original glass pop out during the time when I used the glass pump. So I cement a glass to the underside of the case back. When I used the water tester pump this time, the glass burst.

Unfortunately the front crystal which I wanted to get off is still firmly attached to the case.

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