Sumo crown/stem and caseback gaskets ? - Seiko & Citizen Watch Forum Japanese Watch Reviews, Discussion & Trading
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Old 03-28-2016, 11:21 AM   #1 (permalink)
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Default Sumo crown/stem and caseback gaskets ?

Hi guys,

Can someone be so kind to provide me with the Seiko part numbers for the crown/stem and caseback gaskets for a Sumo ?

Many thanks in advance.
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Old 03-28-2016, 12:05 PM   #2 (permalink)
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It's always better to give the full case code xxxx-xxxx , when asking for part numbers. As it makes it a lot easier for us to help you.
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Last edited by 7s26b; 03-28-2016 at 12:07 PM.
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Old 03-28-2016, 01:02 PM   #3 (permalink)
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Quote:
Originally Posted by Blackdog View Post
Hi guys,

Can someone be so kind to provide me with the Seiko part numbers for the crown/stem and caseback gaskets for a Sumo ?
Caseback can be replaced with a generic of the correct size, after measuring.
Crown gasket should be replace only if pressure testing indicates leaking from there.

The above is valid for pretty much any watch.
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Old 03-28-2016, 01:04 PM   #4 (permalink)
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Quote:
Originally Posted by 7s26b View Post
It's always better to give the full case code xxxx-xxxx , when asking for part numbers. As it makes it a lot easier for us to help you.
Sure thing ! 6R15-00G0.
Thanks !

BTW, is there an online resource for P/Ns vs. Hattori numbers ?
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Old 03-28-2016, 02:37 PM   #5 (permalink)
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0J316BA42CASE BACK GASKET EZ0140B0ACROWN & STEM GASKET from http://service.seiko.com.au/pls/apex...00G0%2CSBDC001 And will also give case vs model
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Old 03-29-2016, 05:02 AM   #6 (permalink)
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Originally Posted by 7s26b View Post
0J316BA42CASE BACK GASKET EZ0140B0ACROWN & STEM GASKET from http://service.seiko.com.au/pls/apex...00G0%2CSBDC001 And will also give case vs model
Many thanks for that !
I see that Cousinsuk stocks the crown gasket, but not the caseback one (by part number at least), but they do have hundreds of generics...
Any chance of knowing the dimensions of the latter (short of opening the back and measuring...) ?
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Old 03-29-2016, 05:10 AM   #7 (permalink)
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Quote:
Originally Posted by jdm.watches View Post
Caseback can be replaced with a generic of the correct size, after measuring.
Crown gasket should be replace only if pressure testing indicates leaking from there.

The above is valid for pretty much any watch.
Thanks for the advise, I know the drill...
The problem I have with the stem gasket is a bit strange.

It is a new watch (couple months old), but after the crystal change to sapphire I started to notice that the crown was a bit too stiff for pretty much anything, from handwinding to pulling out to the different setting positions.

I opened it back and I see (after removing the movement) that the stiffness is definitely the gasket dragging against the tube walls. I even see some black residue in there and around the gasket. It is as if the gasket is rotting.

I have a generic gasket-greasing spongy thing that I used for lubricating the crown gasket too. Maybe it is not compatible with the rubber used by Seiko ?
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Old 03-29-2016, 07:38 AM   #8 (permalink)
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31.6 is the rough size. Always try and use original gaskets where possible, and if the generic grease you used is mineral based, like Vaseline - it will eat the gaskets. Always be sure and use silicone grease, like plumbers grease. Cousins has an "add a non-listed item" service - give them the part number and they'll see if they can order from Seiko for you.
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