Seiko PYQ019 6458-600A Bezel Click Sping and Ball

[PierreChaton]

I'm having some trouble with this 6458 diver. It came to me with the original gaskets, and the bezel was stuck.

After replacing the gasket it rotates fine, but with no click.

The ball and spring appear to be present. The ball prodtrudes slightly, and I can press it down in to the case and have the spring return it.

If I fit the bezel with no gasket at all, or a 0.7mm gasket rather than the OEM 0.9mm, I can get some clicks by spinning the bezel loosely. As soon as I put in a gasket thick enough to provide a bit of friction, I get no clicks at all.

I wasn't expecting the ball and spring to be captive as they appear to be. I see that the Boley and Jules Borel part finders for this case list the spring and ball as replacable parts, but I don't see how to remove the existing ones.

I'm not sure where to go from here, any help appreciated.

[SwissSeiko]

you may have to slightly ream the hole so it can be removed, and replace it with a slightly larger diameter one. Or once its removed, make a round nose pin to take its place. It doesnt necessarily need to be a ball bearing, as other dive cases use a rounded pin.

[AndyGSi]

I thought the bearing should be free although it does look like somethings been done to the hole to retain it, maybe by a previous owner.

Are you sure you're using the correct gasket?

What's the full watch details and what gasket have you got?

[PierreChaton]

1 hour ago, SwissSeiko said:

you may have to slightly ream the hole so it can be removed, and replace it with a slightly larger diameter one. Or once its removed, make a round nose pin to take its place. It doesnt necessarily need to be a ball bearing, as other dive cases use a rounded pin.

Oh, well perhaps, but I won't rush in to that. I'll consider it though.

42 minutes ago, AndyGSi said:

I thought the bearing should be free although it does look like somethings been done to the hole to retain it, maybe by a previous owner.

Are you sure you're using the correct gasket?

What's the full watch details and what gasket have you got?

At one point I thought I could see either some kind of collar or the spring itself at the side of the ball. I'll have another look with a cheap little digital microscope I have.

I've tried a number of gaskets to see if that was maybe the issue.

The watch is this:

The Seiko reference is PYQ019, case number is 6458-600A, the serial indicates it was manufactured in October 1981.

I got the part number 0C3240B02 from this tool: https://boley.de/en/case-parts/seiko/13266.6458-600a?q=6458-600A&p=0&s=10

I ordered one from Cousins. I thought at the time it was OEM Seiko, but it arrived in plain packaging and looking again I see that it has the Cousins logo next to it rather than Seiko:

The part number appears to decode to 32.4mm inner diameter, 0.9mm thick. With that fitted the bezel is very heavy to turn and I get no click.

I've also tried various other generic gaskets in 0.7, 0.75 0.8 and 0.9. The 0.7 is pretty much like having no gasket at all, it spins loosely and I get some clicking, but it's very weak.

Right now I have a generic 0.8 in there. The bezel has an appropriate amount of friction, but no click.

 

[AndyGSi]

Apologies that I didn't see the watch details in the title till after my original post.

0C3240B02 is the correct gasket and looking at your photos again the problem is the bearing is sitting way too low,
probably because what someone has done in the past to try and keep it in place when it should be free.

[PierreChaton]

Coming back to this, I've now been able to compare the 6458 to a couple of their larger siblings the 7548. The two 7548s also have the ball captive in the case, but protruding much more than on the 6458.

Reluctant to do anything irreverable to the case, I decded to try this:

That's the ball from a ballpoint pen sitting on top of the original. Seems to work pretty well.

 

 

[GPrideaux]

You might like to look at this thread:

My ball click wasn't moving at all as the spring had disintegrated. I eventually got the ball and spring out but have yet to replace it.