Seiko 7546-802j - stem question - Seiko & Citizen Watch Forum Japanese Watch Reviews, Discussion & Trading
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Old 10-15-2019, 04:35 PM   #1 (permalink)
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Default Seiko 7546-802j - stem question

Evening, I am hoping to tap into the vast amount of expertise on this forum to help me with a problem I have with my Seiko 7546-802j

Soon after I bought it I was adjusting it when the crown came off in my fingers. I removed the stem and a close look revealed that the threaded end looked too short (it was only long enough for about three threads). I bought a couple of spares and tried to screw the crown on one but to no avail. I might have been too gentle but I didn't want to force it in case I caused further damage

I've had a look inside the crown post to see if there was a broken piece of the stem still in there but it doesn't look like it. I've also had a feel in there with a screwdriver and a rough comparison with a new stem shows that there is enough depth in the post to accommodate six or seven threads which sounds like a more sensible amount.

When looking into the post I can't see much, if any thread although it is difficult to tell. Could the thread have become stripped? If so would it simply be a case of running a tap down to create more thread or would the removal of further metal make the crown useless?

The crown itself is a screw down crown with a spring loaded post. I think I have tracked down the part number for the crown but a quick search indicates there aren't any spares (not surprising, the watch is over 30 years old). Would there be a generic replacement that would work?


Am I missing something simple (I am relatively new to tinkering and this is my first stem/crown adventure)?


Any advice would be greatly appreciated.


I should be able to take photos at the weekend if they are required.
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Old 10-15-2019, 06:49 PM   #2 (permalink)
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55E10 I think is the crown and stem and it is one piece. Some pics may help. These aren't very easy to find at all.. quite a few 7546s use them along with a couple of 6306s. I am not sure I have one spare. Use a pin vice and some locktite and I imagine it will be ok but not sure until a pic or two showing what state it is in.
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Old 10-19-2019, 04:35 PM   #3 (permalink)
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Firstly apologies, I have just realised I posted this on the wrong board.


Here are some photos from my not particularly hi-res microscope:


Looking inside the post:








Not a lot of thread inside as far as I can see


Next a comparison of the two stems, the old one at the bottom and new one on top:





The code I had for the crown and stem was OK0180BOA but that came from a 1978 JDM only parts list, I don't know if my watch was JDM or not.
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Old 10-19-2019, 04:47 PM   #4 (permalink)
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Apologies Guy, I didn't read your reply properly. The winding stem is part no. 55ElONS and I managed to track down two of those. The parts list then gives the crown stem assembly no. as OK0180BOA. As you suggest, that has been trickier to track down.
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Old 10-19-2019, 05:08 PM   #5 (permalink)
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That is a spring loaded crown/stem combo. I was lucky enough to find one in a parts lot last year for a 7546-603X. The stem and crown comes as 1 unit combined. Not easy to find, but there is one or 2 on eBay. Usually asking around $60-$70.

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Last edited by zeke441; 10-19-2019 at 05:10 PM.
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Old 10-20-2019, 02:46 PM   #6 (permalink)
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Thanks for the reply, it is a spring loaded crown/post. However the stem on Zeke's photo above is different to the one on my watch. The new stem I ordered using the part number matches the one on the watch, would that rule out a bodge job by a previous owner? Although it looks like the one that came with the watch was cut too short...



Not surprised at the cost of the replacement parts, perhaps that is why the watch was cheap. That'll teach me.
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Old 10-20-2019, 05:52 PM   #7 (permalink)
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The pic I posted is the correct type. Your old stem may have been a repair someone tried.

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Old 10-20-2019, 06:16 PM   #8 (permalink)
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0k0180b sound like a gasket part #.


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