Sieko 5 Automatic Self Winding Fault...simple Repair?

[jonnya]

I have an Seiko 5 Automatic Sports Black SNKG23. It was second hand and in almost unused condition. It worked fine and kept the time to the second each week....although after a month of use part of the self winding mechanism (the slim cheese wedge shaped part) has loosened and is tapping against the glass on the back of the watch. Is there any way to remedy this issue. I am very practical..could I take the back of the watch of and tighten the screw with the correct tool? Why did it come loose?

 

All replies greatfully recieved,

 

Thank you, Jonathan.

[ro63rto]

Do you have a pic of the rear?

[Geo]

Sounds like the rotor retaining screw has slackened off. It should be an easy fix, just remove the back and tighten it with a screwdriver.

[jonnya]

Thanks....the jeweller suggested it might be something else causing the rotor retaining screw to slacken ...just tightening the screw will remedy the issue?

 

 

Thank you, Jon.

[Geo]

Unless the bearing has failed badly, it should only require tightening.

[bobm12]

I have an ebay Seiko with a similar issue. Tightening the rotor fixed the problem. As Geo said, I'll try that first.

 

Cheers,

 

Bob

[jonnya]

I will do what has been suggested. Thanks for your help. Jonathan.

[jonnya]

I managed to tighten the rotor retainig screw, but the bearings still appear slack (I can hear a bit of a rattle when the rear case is on) What options do I have to repair the watch? New bearings? Does anyone have any ideas where I can get the parts? Thanks, jon.

[ro63rto]

Speedtimerkollection is one I use. Another is schillaci61. Both on ebay.

[64americandeluxe]

Hi Jonnya,

Does the watch use the 7S26(A, B or C) movement?

[bobm12]

Hi jonnya,

It could be the bearing that is "coming apart".

 

Do the watch still winds and gives time correctly? I've seen some of those that although the bearing and rotor are fine, the threaded stem/stud where the rotor screws on is loose at the "barrel and train bridge", being it a pressure fit. The trace is similar to the one left by a defective bearing if the watch works at all. This threaded stem/stud also houses the jewel for the fourth wheel and pinion so when it is "gone" it is best to change the whole bridge and check the pivots on the said wheel...cousins still has this bridge but you need to specify the movement number (on the back of the case, something like 7S26-0050, yours should be definitely different from the example. The first part on the left of the dash is the movement number.)...I would recommend, if you are not familiar with the process and/or don't have the proper tools to consult your local watchmaker...

 

On the other hand, it could be a nice project watch to get you started if you haven't yet! If you screw up, there are parts available out there or you can swap to a more recent (more features depending) Seiko movement like the NH36, about UK$28 or similar (just add the day star with dial disk, intermediate wheel for day corrector and the snap for day star with dial disk from the old movement to your choise of 4R36, 4R15 and/or NH35 all between UK$25 and UK$40, and you are done).

 

Just a thought,

 

Cheers,

 

Bob

[Blacklab]

If it is a 7S26 movement and the rotor is rattling you will nee one of these:

These will fit all 7S26 movements, the only problem being that they are normally stamped 7S26B. They also work in 7002 movements as well. Cousins stock them for £8.25 ex VAT & delivery.

[bobm12]

They also work on 7S36 (a 23 jewel version of the 7S26 and probably the other ones mentioned so far although I've never tried or checked. Hopefully that will fix the problem...

[jonnya]

Thanks for all replies....and a big thanks to Bob...will come back to you shortly. Jonathan.