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Seamaster Cosmic with loose movement

Urban
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Hello all!

I’m brand new in The forum and also new at collecting Omega watches. I recently purchased a Seamaster Cosmic ref. 166.136 with a 752 movement. I immediately noticed that the movement was a little loose inside the case. When I shake the watch I can hear the movement bumping in the case.

As you all know it’s a solid case back so you open it from the dial side. I opened it and could not see anything strange. A video on YouTube tells me that the movement with dial just slides in to the case, turning it a few degrees clockwise, and then the crystal goes back on. Still the same problem...

Anyone here who might know where the problem might be?

All help deeply appreciated!
 
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Archer
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Based on photos hard to tell, but it appears that the crystal may be lacking the tension ring. Can you show just the crystal itself?
 
Urban
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Archer Archer
Based on photos hard to tell, but it appears that the crystal may be lacking the tension ring. Can you show just the crystal itself?
You’re absolutely right, there was no tension ring... But should there be one on this model? I couldn’t see one when looking on a restoration video on YouTube. The crystal seem to fit tight to the case.
 
Archer
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Urban Urban
You’re absolutely right, there was no tension ring... But should there be one on this model? I couldn’t see one when looking on a restoration video on YouTube. The crystal seem to fit tight to the case.

Yes, 100%

You have your answer. Case number should be 166.036, so crystal is - 063PZ5123

Description from Omega for that crystal is - MATERIAL: GLASS PLEXI STEEL RING

Cheers, Al
 
Gui13250
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Urban Urban
You’re absolutely right, there was no tension ring... But should there be one on this model? I couldn’t see one when looking on a restoration video on YouTube. The crystal seem to fit tight to the case.
But isn’t the movement attached to the case? Only the tension ring put it in position in the case?
 
Archer
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Gui13250 Gui13250
But isn’t the movement attached to the case? Only the tension ring put it in position in the case?

The movement isn't "attached" to the case. There are case "clamps" but they do not clamp in this style of case, they merely act as retainers that don't let the movement fall out. The movement is not held firmly by anything other than the crystal.
 
Gui13250
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@Archer thanks.

is it specific to this case, or does it is the same for a 168.005 for exemple?
 
Urban
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Archer Archer
Yes, 100%

You have your answer. Case number should be 166.036, so crystal is - 063PZ5123

Description from Omega for that crystal is - MATERIAL: GLASS PLEXI STEEL RING

Cheers, Al
Thank’s Al! The crystal only had a thin chrome edge around it. It didn’t look as a tension ring, and it seemed solid on the crystal edge... Do you know where I can find such a tension ring?

Really appreciate your help!
 
Archer
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Gui13250 Gui13250
@Archer thanks.

is it specific to this case, or does it is the same for a 168.005 for exemple?

This is the case only for front loading cases generally...
 
Archer
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Urban Urban
Thank’s Al! The crystal only had a thin chrome edge around it. It didn’t look as a tension ring, and it seemed solid on the crystal edge... Do you know where I can find such a tension ring?

Really appreciate your help!

Not really...
 
Archer
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Urban Urban
Ok, I guess I have to contact an Omega dealer...

Well, you as a private individual won't be able to buy the crystal. It would have to be purchased by a watchmaker with an Omega parts account, and they could install it for you as well.

You could try to find a crystal somewhere using the part number I've given you - even a scratched up one with a good tension ring would work...
 
J
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Gui13250 Gui13250
But isn’t the movement attached to the case? Only the tension ring put it in position in the case?

For all that I know (correct me where I'm wrong) the movement is "pressed down" into place by means of the crystal/tension ring, but then it should have kindof a bayonete guide since the other thing that retains the movement in place is the crown stem, which is made of two pieces. If it's not in proper shape, it will "jump out" when you try to set time/date and the whole face/movement will move counter-clockwise.
 
Urban
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Archer Archer
Well, you as a private individual won't be able to buy the crystal. It would have to be purchased by a watchmaker with an Omega parts account, and they could install it for you as well.

You could try to find a crystal somewhere using the part number I've given you - even a scratched up one with a good tension ring would work...
Ok, but If the ring is mounted on the crystal I might have missed it. I know I saw something chrome-metal at the edge of the crystal. Could it be the glossy ring in these pictures that is the tension ring?
 
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X350 XJR
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Yes there is a tension ring you your watch, however I believe the correct Omega tension ring for this reference has a step where as a generic one usually doesn't.
 
Urban
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X350 XJR X350 XJR
Yes there is a tension ring you your watch, however I believe the correct Omega tension ring for this reference has a step where as a generic one usually doesn't.
I see, but the crystal has the omega logo in the middle... I noticed now that when I pull the crown one step (time setting) and move it a little in and out, the dial moves a little from side to side. Then when I put a finger on the crown, still in time setting mode, and shake the watch from side to side, the movement is not bumping from side to side like it does when the crown is fully in...
 
Archer
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Urban Urban
I see, but the crystal has the omega logo in the middle... I noticed now that when I pull the crown one step (time setting) and move it a little in and out, the dial moves a little from side to side. Then when I put a finger on the crown, still in time setting mode, and shake the watch from side to side, the movement is not bumping from side to side like it does when the crown is fully in...

In your newer photos, the ring can be seen, but it appears to me that it's not touching the dial - I see a gap. If that is the case, then it may be the wrong tension ring, or wrong crystal for this model.
 
Urban
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Archer Archer
In your newer photos, the ring can be seen, but it appears to me that it's not touching the dial - I see a gap. If that is the case, then it may be the wrong tension ring, or wrong crystal for this model.
Ok! The ring comes with the crystal, or can I order just a ring?
 
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