Crown & Stem Vs Movements - Seiko & Citizen Watch Forum Japanese Watch Reviews, Discussion & Trading
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Old 01-29-2017, 12:17 PM   #1 (permalink)
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Default Crown & Stem Vs Movements

How do I tell whether a crown & stem can fit a particular movement? Is there a way to know which crown/stem matches which movement?

Thanks for the advice!
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Old 01-29-2017, 12:34 PM   #2 (permalink)
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Normally the crown is not specific to the movement, except when is a single piece with the stem.

The stem is, so you need to know part numbers, or visually check it.

What is you actual problem?
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Old 01-29-2017, 12:38 PM   #3 (permalink)
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Thanks for the quick reply.

But how do I visually check it?

Trying to understand which crown/stem can fit which movement.

I'm not skilled to remove crown from stem and reattach so I would most likely keep the crown/stem combi original.


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Originally Posted by jdm.watches View Post
Normally the crown is not specific to the movement, except when is a single piece with the stem.

The stem is, so you need to know part numbers, or visually check it.

What is you actual problem?
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Old 01-29-2017, 12:43 PM   #4 (permalink)
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Speaking practically, what are you trying to do right now?

If you want to replace a crown you keep the original stem, it easy to remove.
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Old 01-29-2017, 12:44 PM   #5 (permalink)
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The Crown is specific to the case, the stem is specific to the movement, except where the crown and stem are a one piece affair, then its specific to a particular model.
EG a one piece crown and stem for a 7002 diver will only fit a 7002 diver (it will also fit an SKX007/9), But if you take the 7002 movement out of the diver and put it into a dress watch you would have to use a separate stem and the crown that came with the case your putting the movement into.
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Old 01-29-2017, 12:52 PM   #6 (permalink)
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Well I have a spare crown/stem that I do not know where it came from. Like it and want to see if I can attach it to a 4R36 movement. That's just the trigger for the question. How does one know whether a crown/stem can fit another movement?

I was just trying to find out if anyone can point me to a general rule or idea.

For example, all stems from 4R36 can fit 4R35 movements, etc.

I don't know whether that is possible. So I just had to ask.

Thanks!

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Speaking practically, what are you trying to do right now?

If you want to replace a crown you keep the original stem, it easy to remove.
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Old 01-29-2017, 01:02 PM   #7 (permalink)
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Quote:
Originally Posted by violetmind View Post
Well I have a spare crown/stem that I do not know where it came from. Like it and want to see if I can attach it to a 4R36 movement. That's just the trigger for the question. How does one know whether a crown/stem can fit another movement?

I was just trying to find out if anyone can point me to a general rule or idea.

For example, all stems from 4R36 can fit 4R35 movements, etc.

I don't know whether that is possible. So I just had to ask.

Thanks!
Nah it don't work like that

if the crown and stem is a one piece unit, it might well fit the movement but may well be too short/long to fit the case your using, if it happens to be the right length, will the crown fit the case tube?
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Old 01-29-2017, 01:09 PM   #8 (permalink)
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Quote:
Originally Posted by violetmind View Post
Well I have a spare crown/stem that I do not know where it came from. Like it and want to see if I can attach it to a 4R36 movement.
Assuming it's the same thread "tap", remove original and try the other. If the crown doesn't unscrew easily, use heat from a lighter or welder tip to loosen the locking agent. Remove stem gasket before doing that
Forget about the stem, you are not replacing the stem. Let me add, I think your 4R36 watch is just fine with the original crown.
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Old 01-29-2017, 01:11 PM   #9 (permalink)
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Thanks guys. But I still don't know how to approach this.

How does one even know whether the stem and crown is one piece?

I can try wiggling the stem from the crown but i do not want to make a one piece become a permanent two-piece!
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Old 01-29-2017, 01:17 PM   #10 (permalink)
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Take a look at where the crown meets the stem, does the stem look to be threaded, if so the crown will unscrew from the stem, if its not threaded and you can wiggle the stem slightly its a one piece crown and stem
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Old 01-29-2017, 01:19 PM   #11 (permalink)
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Originally Posted by ivorbiggin View Post
Take a look at where the crown meets the stem, does the stem look to be threaded, if so the crown will unscrew from the stem, if its not threaded and you can wiggle the stem slightly its a one piece crown and stem
Thanks will try that.

But as for the question about which stem fits which movement, I guess it's only possible to know from me knowing which movement it came from?
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Old 01-29-2017, 01:23 PM   #12 (permalink)
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Thanks will try that.

But as for the question about which stem fits which movement, I guess it's only possible to know from me knowing which movement it came from?
In reality yes, though you could try gently installing the stem into the movement to see if it will fit, but there is a risk of upsetting the keyless works so not recommended if your not sure what your up to
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