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Seiko 7009-876A

ligangyi

By ligangyi
in Watch Repairs Help & Advice

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ligangyi Member

ligangyi

Posted
Posted

Got myself one of these to mess around with, it was not working when I got it. I've managed to disassemble, clean and reassemble everything and get it to work. Howecer there are 2 small issues.

1. The stem+crown that came with the watch seems to protrude too much. I see about 2-3mm of exposed stem with it in. I don't see how the stem can be any shorter as there are no exposed threads. It was like that when it came so it's not something I reassembled wrongly.

2. The 4th wheel staff is bent/damaged. Might have been me or someone before me. Didn't take a good look before I dived in. I'm guessing a donor watch or movement is my best bet here.

If anybody can offer me suggestions on what I'm doing wrong please do. Especially regarding the stem, I'm really scratching my head on that.

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bobm12 Distinguished Member

bobm12

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Hi ligangyi, that movement is an older version (or close) to the 7S26 and cousinsUK stock many of those parts (If UK distributors are convenient to you).The part you need may be interchangeable with newer movements as the 7S26...maybe. In any case, check cousinsUK just in case. Other than that, a donor could solve the problem...if the part in it is sound.

 

The stem+crown issue may be a wrong crown fitted in...I had a similar situation once but probably not as bad since I was able to solve the problem replacing the crown. Also, sometimes people glue them without threading them all the way in which may be an issue...which doesn't seem to be your case by the way.

 

Hope this helps,

 

Cheers,

 

Bob

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ligangyi Member

ligangyi

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The 7009 incorporates a quick set day/date mechanism, so the crown will tend to protrude slightly. For more info see here: https://www.youtube.com/watch?v=VM6xI-WVly0

 

Hi there, it's protruding enough for me to see the tube that it runs into. The stem is going in all the way and touching the lever on the other end that actuates the quickset, so I can't really tell for sure what the issue is. Are different length crowns used/available?

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Blacklab Distinguished Member

Blacklab

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Posted (edited)

Looks like it has had the crown replaced with the wrong one at some point, possibly the stem too. The 6619-8230 pictured below has a similar quick set crown:

post-80-0-96438200-1424618380_thumb.jpg

As you can see the crown is thinner & protrudes slightly with a small gap to allow for the quick set to operate. Probably best to order a new one - Seiko part number 40MK1NS1, £2.95 from Cousins. Stems are also available - part no 354.022 and cost £1.50.

Edited by Blacklab
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CKelly WRT Addict

CKelly

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Hi,

   I would think the stem is correct. If you look closely at the photo posted by Blacklab the crown appears to have a slight gap between it and the case tube. I'm not exactly sure about this movement but I have my dads old 6139 Seiko and this gap was there to allow the crown to be pushed in to quick change the date with each push. Unless the stem broke at some time and has an extender on it I would think that the thin Seiko crown was just replaced by a generic crown that is just too thick.

Charles K

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  • 2 weeks later...
ligangyi Member

ligangyi

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Just a folow up and closure to this issue. I received the correct parts from cousins. The stem was indeed incorrect (as well as the crown). Here's a closeup picture.

 

It's a fairly significant difference, the length is about similar but the machining is not the same. The new stem and crown (after I've cut it) fits perfectly like it should. Thanks for all the help guys. 

post-702-0-81163300-1425488200_thumb.jpg

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bobm12 Distinguished Member

bobm12

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Good job. Apparently the old stem belongs to another seiko of much recent manufacture. I'd venture to say it belongs to something like the NH36 with manual winding capabilities...In any case, I would save this old stem just in case it is useful in the future.

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