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Seiko skxa35 all over the place and stopping

Honestsheet
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Honestsheet Member

Honestsheet

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Hi All. My long lost skxa35 has been found and was obviously not wound. I took it to my local guy and he put it on the timegrapher in multiple positions and it was all over the place. I took it home and opened it up for the 1st time and first thing I see is the scratched case back. I wound it up and it kept perfect time face down and up. Next I wound it again and put it on and it stopped dead after about 10 minutes. Do you think the movement is loose in the case and the second hand is touching the crystal? Where should I start?

 

Thanks in Advance

 

Adam9ec5ae0063d8cf5b844a5aaef90e9883.jpgab43eb53e7096c691b31955cd3302651.jpg252d67219ec141bc653e58724322123c.jpgebec33496980ebcdaa8dc22181ae3830.jpgf3784471cc1468035076eaa44b3dbadc.jpga26e265cf759a344be0007c28d1735c6.jpg3516a28a64f4b28f7bdfb386881eb7bf.jpg53f08a44525a2b6da2c205b5043ffcbc.jpg

 

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jdm Distinguished Member

jdm

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17 minutes ago, Honestsheet said:

Do you think the movement is loose in the case and the second hand is touching the crystal?

That is unlikely but an easy check is to have it run outside the case.
A 7S26B can't be very new, so take into consideration that the mov.t need repair or replacement.

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Honestsheet Member

Honestsheet

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Thanks JDM. I was afraid of that, what do you think about the wear pattern on the case back? I knew my options were limited to repair or replace, just was hoping for an easier fix. I guess replace would be the easiest fix. Gonna practice servicing on another 7s26 that I know is working. I think having it serviced would cost around 150 or so. The replacement 7s26 I found is 75 bucks + shipping. Or do the nh36 upgrade. Lot of options now. Ugh. Thanks again

Adam

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jdm Distinguished Member

jdm

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3 minutes ago, Honestsheet said:

Thanks JDM. I was afraid of that, what do you think about the wear pattern on the case back? I knew my options were limited to repair or replace, just was hoping for an easier fix. I guess replace would be the easiest fix. Gonna practice servicing on another 7s26 that I know is working. I think having it serviced would cost around 150 or so. The replacement 7s26 I found is 75 bucks + shipping. Or do the nh36 upgrade. Lot of options now. Ugh.

Caseback marks would be caused by a lose rotor (check central screw). Due to its clever construction it's practically impossible to have a lose mov.t in a Seiko 5. As you said, you've a lot of options and fun ahead, good luck.

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Deggsie WRT Addict

Deggsie

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Hi All. My long lost skxa35 has been found and was obviously not wound. I took it to my local guy and he put it on the timegrapher in multiple positions and it was all over the place. I took it home and opened it up for the 1st time and first thing I see is the scratched case back. I wound it up and it kept perfect time face down and up. Next I wound it again and put it on and it stopped dead after about 10 minutes. Do you think the movement is loose in the case and the second hand is touching the crystal? Where should I start?
 
Thanks in Advance
 
Adam9ec5ae0063d8cf5b844a5aaef90e9883.jpg&key=4bd12ce0974cab17064ad627531d66991f2d5636da389cc6f38290eb683f1b13ab43eb53e7096c691b31955cd3302651.jpg&key=9228d25f7b0ae154058e85cb5686d45c297cd6cb7580a558870bacaf95b79d01252d67219ec141bc653e58724322123c.jpg&key=723bee4a37c79ef0a90f375fb5ec4e067a9b04df9cb9d8dcd0bdc15fc88d4c00ebec33496980ebcdaa8dc22181ae3830.jpg&key=f284506b8011b11f41fdae4cfdb972bc902ed4ef9ef092a96d4811e3b4bc6d89f3784471cc1468035076eaa44b3dbadc.jpg&key=e4aea028085ad5efb989a4965de27077d759b7be0598b3bb69d1ce8e6a58f061a26e265cf759a344be0007c28d1735c6.jpg&key=00d7dd8a04e7987ef63fe1618ab6e563304377d56d5db4a7404f3084e3c131d13516a28a64f4b28f7bdfb386881eb7bf.jpg&key=7c2ff25d7010a9d84b707679508d02764acb87effd2b77b95bc58f107f93b3b053f08a44525a2b6da2c205b5043ffcbc.jpg&key=1e04d5c8c2d1caa546cac51b7884215c2fad6e334b4828c9f897713e9c2bca9a
 
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Hi Adam. It’s not clear from the photo but could you check that the dull patch on the inside of the cover is definitely ‘scratched’ or just an are where the cover was not ‘cleaned up’ by the lathe machining operation. If thee is metal to metal contact then you should see wear not just on the inside of the cover, but on the corresponding part(s) rubbing on it. Regards Deggsie
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Deggsie WRT Addict

Deggsie

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That is unlikely but an easy check is to have it run outside the case.
A 7S26B can't be very new, so take into consideration that the mov.t need repair or replacement.

The 7A26B is like the AK47. .... just keeps going and tough as nails. In my option they are somewhat characterless, but the movements have to be credited with their ability to survive harshest misuse.


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Deggsie WRT Addict

Deggsie

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Yes that seems logical because the rotor is clean.

Adam

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Hi Adam. You say it is your long lost watch, assuming it wasn’t lost down the garden a few years ago, but just misplaced at the back of your pants drawer, I would say a good service is all it needs.


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weegaz22 Member

weegaz22

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Are you sure the case back is original to the watch? it says Japan on the case back but its a Malaysia built movement on the rotor?, and the fact that there is no rubbing on the rotor parts makes me think its a different back from another watch, usually all the K (Korea,Malaysia) built Seiko's I've seen never have Japan written anywhere on them as those are the J model codes that usually fetch a slightly higher price

 

I could be totally wrong on this though, as I'm fairly new to this, so take it with a pinch of salt

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Melt WRT Addict

Melt

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4 hours ago, weegaz22 said:

Are you sure the case back is original to the watch? it says Japan on the case back but its a Malaysia built movement on the rotor?, and the fact that there is no rubbing on the rotor parts makes me think its a different back from another watch, usually all the K (Korea,Malaysia) built Seiko's I've seen never have Japan written anywhere on them as those are the J model codes that usually fetch a slightly higher price

 

I could be totally wrong on this though, as I'm fairly new to this, so take it with a pinch of salt

These were built in Malaysia but if you look carefully it says Japan cased. So maybe movement and some parts outsourced then put together at Seiko.

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jdm Distinguished Member

jdm

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1 hour ago, rodabod said:

It's about £35 for an NH35 movement which is superiuor to the 7S26, so I'd just swap one of those in rather than servicing one of these.

Can't do a straight NH36 swap swap on a 7S26 Seiko diver's, because the stem is different, and the original stem/crown is one part. So one will need either a Seiko crown/stem (hard to find and expensive), or a compatible crown to screw to the new stem.

Also, both the day disc and and the case ring need to be ported from the original to the new mov.t, otherwise the day won't align, and the mov.t will not be correctly hold in place.

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weegaz22 Member

weegaz22

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even if you could swap in a new movement, wouldn't you rather try and service and repair it by stripping it apart, cleaning and re-oiling and checking all the parts to find out what the issue is first? thought that was the point of these forums?. has it been apart before? 

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weegaz22 Member

weegaz22

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3 hours ago, Melt said:

These were built in Malaysia but if you look carefully it says Japan cased. So maybe movement and some parts outsourced then put together at Seiko.

Ahh, i couldn't make out the lettering after Japan due to the reflection

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jdm Distinguished Member

jdm

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17 minutes ago, weegaz22 said:

even if you could swap in a new movement, wouldn't you rather try and service and repair it by stripping it apart, cleaning and re-oiling and checking all the parts to find out what the issue is first? thought that was the point of these forums?. has it been apart before? 

It depends by the individual. Not everyone is willing to spend $50 just for the correct lubricants, plus the needed tools. The Seiko hairspring is extremely delicate and difficult to correct if distorted. Then you need a timegrapher or equivalent app for verification and regulation.

I think that if one hasn't done it before, it would be better to learn first on an easier mov.t, with HD video course

https://www.watchrepairlessons.com/

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Honestsheet Member

Honestsheet

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even if you could swap in a new movement, wouldn't you rather try and service and repair it by stripping it apart, cleaning and re-oiling and checking all the parts to find out what the issue is first? thought that was the point of these forums?. has it been apart before? 
So yes I just stripped down an older 7s26 and I'm now putting it back together in horrible fashion. Just kept going without this piece!681282948014bd6c2ecb9b12ebd36135.jpg02574c443e3b174dbcd9329874bfa8c3.jpg68bb76bab0c77f6a33830af1cd418f25.jpg

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rodabod Distinguished Member

rodabod

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On 11/03/2018 at 1:10 PM, jdm said:

Can't do a straight NH36 swap swap on a 7S26 Seiko diver's, because the stem is different, and the original stem/crown is one part. So one will need either a Seiko crown/stem (hard to find and expensive), or a compatible crown to screw to the new stem.

Also, both the day disc and and the case ring need to be ported from the original to the new mov.t, otherwise the day won't align, and the mov.t will not be correctly hold in place.

I did a straight swap a couple of weeks ago on a 7S26 with crown at 4 o’clock. The NH36 included a stem, so just cut and re-fitted crown. Tap size appeared to be the same.

I prefer to fit new cheaper Seiko movements because as you say, the hairsprings are quite soft and I’ve never found they can be corrected as good as new by manipulation. And there’s no chance that my time servicing an old movement is worth less than £35. 

Edited by rodabod
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jdm Distinguished Member

jdm

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1 hour ago, rodabod said:

I did a straight swap a couple of weeks ago on a 7S26 with crown at 4 o’clock. The NH36 included a stem, so just cut and re-fitted crown.

Correct, that was then a Seiko 5 with a regular crown. But diver's watches like the OP's have a screw-in crown that is assembled as single part with the stem, and a thicker plastic mov.t ring.

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Honestsheet Member

Honestsheet

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Hey everyone thanks for the replies. I think I'm going to buy a doner and and just swap it out. First I'll try to service the old movement 7s26b before swapping it with the newer c model. Thanks and keep the ideas flowing. Sue there will be more to this!

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