Seiko Skyliner / Caliber 402 Problem - Seiko & Citizen Watch Forum Japanese Watch Reviews, Discussion & Trading
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Old 01-09-2020, 10:45 PM   #1 (permalink)
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Default Seiko Skyliner / Caliber 402 Problem

I bought a Skyliner with the 402 caliber a couple of months ago. When it came, it made a little clinking / clunking noise when I turned my wrist over but generally ran pretty well.

I sent it out for service (to a trusted watchmaker) and upon return it still has that clunk, plus every now and again it will stop working for a short period and then start back up again. This doesn't happen often - maybe once a day every few days - other times it runs fine and keeps good time. It never seems to stop when laying flat.

The watchmaker warrants his work, so it is likely to head back to him. Any suggestions for what might be wrong? I'd love to be able to give him an idea of what to look at and possibly buy any necessary parts before sending it.

Thanks!

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Old 01-10-2020, 08:40 PM   #2 (permalink)
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I am not that familiar with cal 402 but looks pretty basic and similar to Swiss architecture. My only guess is that something is not quite right with the movement retaining screws or retaining ring that holds it in the case. Often, some watches come with small retaining clips that the two screws on the outer ring of the movement go through that apply pressure to the case to keep the movement in place inside the case. If this watch is supposed to have those retaining clips and they are gone, the screws will not be sufficient to hold the movement in place and there will be some slight movement when the case back is closed. This may be the clunk you hear sometimes. The balance wheel looks awfully close to the side of the case so if the movement shifts, it could allow the balance wheel to touch the side of the case stopping the watch. Again, only a guess. Someone with a case guide for this watch may chime in. Please post the case and model number for the watch which should be imprinted on the case back.
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Last edited by Vette Enthusiast; 01-10-2020 at 08:43 PM.
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Old 01-10-2020, 09:54 PM   #3 (permalink)
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Thanks John - I've uploaded a photo of a caseback and movement from a watch that is on ebay right now - same model.




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Old 01-13-2020, 02:57 AM   #4 (permalink)
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As John said,check first the retaining screws.Then,if there's a gasket on the crown,in pretty good shape.And the correct type on the back,it should be flat.
The point that it stops sometimes make think about a not weel done hands fitting.
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