7546-6040 Crystal Fit

I wouldent have thought a glass crystal could be sized any amount without breaking ?

TheTigerUK said:

I wouldent have thought a glass crystal could be sized any amount without breaking ?

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this mean you think it cannot be fitted?
that's a genuine Seiko 300WB0GN00 crystal.

The crystal will not resize so it should be just slightly smaller than the case to allow for the gasket.

I would double check the measurements and that the part number is correct.

gaussman said:

this mean you think it cannot be fitted?
that's a genuine Seiko 300WB0GN00 crystal.

Click to expand...

Have you measured the case size correctly ?

Parts are correct.
If someone has a Seiko Quarts Casing Guide it would be useful...
I can only check on the web.

Also I found a thread with the same dimensions reported:
http://www.thewatchsite.com/21-japanese-watch-discussion-forum/40923-7546-6040-crystal-gasket.html

I have just checked my case book and it gives the crystal as 300WB0GA, glass fixing ring as 86109513 and plastic gasket for glass as 86179660

I have that same watch and replaced the crystal about two months ago. The crystal number you mention is the one I used - although my original crystal gasket was okay, so I greased it and used it again. To be clear, the crystal itself should press into the metal retaining ring with hand pressure (and the thin rubber o-ring gasket). Then the crystal/retaining-ring assembly should be press into the case with the nylon gasket requiring a case press. I'm a little puzzled why your crystal won't fit - but I have a spare crystal for that watch, so if you're in the spirit to just go for it and the crystal breaks, I'm happy to sell you mine.

twall3 said:

I have that same watch and replaced the crystal about two months ago. The crystal number you mention is the one I used - although my original crystal gasket was okay, so I greased it and used it again. To be clear, the crystal itself should press into the metal retaining ring with hand pressure (and the thin rubber o-ring gasket). Then the crystal/retaining-ring assembly should be press into the case with the nylon gasket requiring a case press. I'm a little puzzled why your crystal won't fit - but I have a spare crystal for that watch, so if you're in the spirit to just go for it and the crystal breaks, I'm happy to sell you mine.

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So the crystal must be fitted from the the back!
This way it's really clear what's the procedure
How can I take out the crystal retaining ring before inserting the new glass?
I must take out also the chapter ring I suppose.
Shall I use a small flat head screwdriver?
Please let me know!

gaussman said:

So the crystal must be fitted from the the back!
This way it's really clear what's the procedure
How can I take out the crystal retaining ring before inserting the new glass?
I must take out also the chapter ring I suppose.
Shall I use a small flat head screwdriver?
Please let me know!

Click to expand...

The crystal/retaining-ring assembly still has to be taken out of the front, but yes, the crystal is fitted into the retaining ring from the back. Once you have the bezel and the movement removed, use a crystal press to push the crystal out the front (be sure not to press on the chapter ring). The crystal/retaining-ring will press out of the front as an assembly (the chapter ring can then be lifted out the front). Once the crystal/retaining-ring assembly is removed, you should be able to press the crystal out the back of the retaining ring. Mine came out with thumb pressure, but if the gasket that holds the crystal in the ring is deteriorated, it may require some more work.

Another note - I wouldn't recommend using a small flat-head screwdriver to pry anything out. Doing so will likely scratch up the stainless steel parts, and may gouge or crack the chapter ring. If you don't have a crystal press, it really is worth at least buying an inexpensive one online and waiting for that before proceeding.

Correct. Press the fixing ring (what I'm calling the retaining ring) from the back, out the front. Don't press on the dial-ring/chapter-ring.

...by the way - where did you find that cross-section?

twall3 said:

...by the way - where did you find that cross-section?

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It's on page 8 of the 7546A Manual/Parts list :
http://www.thewatchsite.com/d1/files/Seiko%20Technical%20Manuals/7546A.pdf

gaussman said:

It's on page 8 of the 7546A Manual/Parts list :
http://www.thewatchsite.com/d1/files/Seiko%20Technical%20Manuals/7546A.pdf

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Thanks for that! I had no idea those manuals were posted there...great resource.

Hi mates,
you think the case is the same of 7546-606A?
I found a very nice explanation here:
http://www.network54.com/Forum/78440/thread/1249129118/7546-606A+crystal+removal

gaussman said:

Hi mates,
you think the case is the same of 7546-606A?
I found a very nice explanation here:
http://www.network54.com/Forum/78440/thread/1249129118/7546-606A+crystal+removal

Click to expand...

Yeah, that looks to be the same.

I have a problem.
The fixed bezel ring (picture 2 of the uplisted link) is stuck.
The dial ring is still there and I cannot uderstand how can i take out the fixed bezel ring....
Some suggetions?

How are you trying to remove it? Are you using a crystal press and applying pressure directly to the backside of the crystal?