Seiko SKX and SRP DLW Crystals issues. - Seiko & Citizen Watch Forum – Japanese Watch Reviews, Discussion & Trading
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Old 11-26-2019, 02:48 AM   #1 (permalink)
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Default Seiko SKX and SRP DLW Crystals issues.

Morning guys,

I'm in a trouble: i got a SKX and a SRP77x to mod,they're not my first tries.
My tools seems to be in decent shape, Robur press and Alloys dies.

But...2 times i try to fit a DLW crystal (Top HAt in the SRP and a Flat Type Low in the SKX) ,and 2 times i smashed the crystal gasket..on both.
The first gasket was the original one,and the second i've ordered from CT the same (sold as genuine).

On several attempts, i tried to fit the case exactly in the good position underneath with the ''R'' die (exact diameter of the back case) and press the crystal with ''P'' die.It covers the top shape of the crystal.Still 1 millimeter on a side,cannot push more,and gasket was a little bent...

I have no matters with original ones (i tried on a old snk809)..

Is there something i did wrong to your mind ?

Last information,i observed a wider diameter of the SKX crystal,about 1/2 milimeter.The Top Hat is 32.03 mm wide.

Thanks for the help.
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Old 11-26-2019, 03:33 AM   #2 (permalink)
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That's annoying for you





I sometimes chamfer the edge of the glass on my fine oil stone (by hand) so it starts it off in the seal more easily.



You could sand the inside of the seal out a little.




I never like fitting domed or high glasses for people and try to put them off. They're scratch magnets and then look terrible.
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Old 11-26-2019, 06:16 AM   #3 (permalink)
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Originally Posted by nzwatchdoctor View Post
That's annoying for you


I sometimes chamfer the edge of the glass on my fine oil stone (by hand) so it starts it off in the seal more easily.
It can be a good solution.I'll try.Thanks.
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Old 11-26-2019, 06:49 AM   #4 (permalink)
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I recall reading somewhere that one of these aftermarket manufacturers had this issue about their crystals being a PITA to install. I can’t remember if its crystaltimes or dlw though.


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Old 11-26-2019, 08:40 AM   #5 (permalink)
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Originally Posted by Acidstain View Post
I recall reading somewhere that one of these aftermarket manufacturers had this issue about their crystals being a PITA to install. I can’t remember if its crystaltimes or dlw though.


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I don't believe in coincidence,both came from DLW...
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Old 11-26-2019, 08:45 AM   #6 (permalink)
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If the diameter is wrong, send the crystal back.
Don't force it in, and don't sand anything if you want to maintain waterproofing.
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Old 11-26-2019, 11:07 AM   #7 (permalink)
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Yup 0.03mm will make quite a difference.
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Old 11-26-2019, 05:15 PM   #8 (permalink)
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Quote:
Originally Posted by 7s26b View Post
If the diameter is wrong, send the crystal back.
Don't force it in, and don't sand anything if you want to maintain waterproofing.







If the glass is still a firm friction fit the water resistance (not proof) is not compromised. I always re water pressure test them afterwards.
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Old 11-26-2019, 05:49 PM   #9 (permalink)
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Quote:
Originally Posted by nzwatchdoctor View Post
If the glass is still a firm friction fit the water resistance (not proof) is not compromised. I always re water pressure test them afterwards.

I disagree with that.
The SRP and ASFAIK the SKX gaskets are parallel "I" shaped gaskets. When you press the crystal in, the gasket deforms slightly to form a L shape and gives the crystal a base to sit on. By chamfering the crystal the gasket wont deform properly and the crystal wont be seating correctly.


The original crystals and gaskets are made to an exact tollerance in order to make a perfect friction fit, not a firm or any other kind of friction fit
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Old 11-26-2019, 10:31 PM   #10 (permalink)
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[QUOTE=ivorbiggin;2856053]I disagree with that.
The SRP and ASFAIK the SKX gaskets are parallel "I" shaped gaskets. When you press the crystal in, the gasket deforms slightly to form a L shape and gives the crystal a base to sit on. By chamfering the crystal the gasket wont deform properly and the crystal wont be seating correctly.


Why do they work for me then and water pressure test (as in a Bergeon tester with water in it) fine?



Why is it I've done this for customer's glasses years ago and they're still using their watches for diving, surfing, swimming etc?
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Old 11-27-2019, 03:58 AM   #11 (permalink)
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Quote:
Originally Posted by ivorbiggin View Post
I disagree with that.
The SRP and ASFAIK the SKX gaskets are parallel "I" shaped gaskets. When you press the crystal in, the gasket deforms slightly to form a L shape and gives the crystal a base to sit on. By chamfering the crystal the gasket wont deform properly and the crystal wont be seating correctly.


The original crystals and gaskets are made to an exact tollerance in order to make a perfect friction fit, not a firm or any other kind of friction fit
In doubt,i can't see where the L shape can sits ? There's directly for SRP7xx the chapter ring,and too much play between case and it ?
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Old 11-27-2019, 09:44 AM   #12 (permalink)
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As stated, be sure the crystal is the right diameter. The inside of the gasket is not smooth and some of the aftermarket crystals have too sharp of an edge to slide into the gasket without grabbing the sides and crushing it. That edge can be dulled with a fine stone. When setting the crystal in place to be pressed spin it back and forth a bit and be sure it's starting inside the gasket and not on top of the edge of the gasket before pressing it.
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Old 11-27-2019, 11:44 AM   #13 (permalink)
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I have changed 100s (literally) SKX crystals and I have found that some of the after market crystals can be a right PITA.

I try to start them off by hand if possible before pressing them in and for me I find it really important that the crystal is sitting true before you press down.

I also find at times when using a used/old gasket it can be hard to press the crystal right down tight to the chapter ring.

Every used crystal gasket I have checked have all become L shaped after pressing a crystal in.

I have buggered a few gaskets up over time but fingers crossed not so many of late.
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Old 11-27-2019, 04:55 PM   #14 (permalink)
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Quote:
Originally Posted by Gundamx001 View Post
In doubt,i can't see where the L shape can sits ? There's directly for SRP7xx the chapter ring,and too much play between case and it ?

Heres a pic of a 7002 crystal and gasket that i have removed from the case. Ive placed the gasket around the crystal and taken a pic of the underside so you can see the lip that the crystal sits on. The gasket started off as a parallel "I" shape. The SKX is the same design, and the SRP (though ive not had one apart as of yet), uses the same gasket as the 7002.
I used to keep all the old 7002 crystal gaskets because new ones were unavailable untill the SRP came out, SRP and 7002 crystal gaskets have the same part number, so now when i install a new crystal on a 7002 i install a new gasket as per Seiko instructions.
When i am creating a modified 7002 and want to use a crystal thats only available for the SKX, i will use a Sterkreuz L314 L shaped gasket. Ive never had problems with loose or squashed up chapter rings.



20191127_202720.jpg
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