Seiko Presage 4R35B movement

[Gaus]

Hello watchfriends, a friend of mine told me his watch was loosing time and the watch is not very old. It is a Seiko Presage with a caliber 4R36B. I found out that the watch was made in 2019.

At the timegrapher I saw these readings. The beat error is nog very bad, but the amplitude is very low (after full winding). And yes it is loosing a lot of time.

What could case this problem? Any suggestions? Seems to me not a normal serviceproblem. Mainspring defect? Thank you al in advance.

With kind regards,

 

Hans

[AndyGSi]

Do you know how long it runs on a full wind?

[Gaus]

Hello Andy, no not yet. 

 

Other readings:

crown down -/- 162 139 0.4

Dial down -/- 75 163 0.8

9 down -/- 600 149 1.9 (weird reading

6 down -/- 152 133 1.1

 

[Nucejoe]

I concur with Andy, then if it ran close to its nominal power reserve, add a bit of power to the barrel manually (  use  wooden tool ),  if amplitude improved, we can suspect  insuficient torque supply by barrel. 

 Add power to any gear of the train that you have access to, a good test, usually indicates faulty escape between escape teeth and pallets or the escapement.

Does it run slow in all positions?

 

 

 

[Gaus]

Thank you all, I'll investigate further. I will let you now what I found. Gr. Hans

Hello AndyGSI/Nucejoe, the movement stopped after 22 hours. The normal powerreserve should be arround 40 hours. 

[Gaus]

these were the readings just before the watch stopped after 22 hours

Dial up -/- 118 146 0.9

Dial down -/- 117 150 0.9

9 down -/- 228 140 0.9

crown down -/- 867 140 0.9

Dial front -/- a lot 124 0.9

8 down -250 160 0.0

crown down and  dial front strange readings (noises)

The mainspring is not broken but not quite oke

Edited October 4, 2024 by Gaus

[Nucejoe]

2 hours ago, Gaus said:

The mainspring is not broken but not quite oke

Agree, its bent, no point trying to sort out this one, replace with new.

 TG reading at such low amplitudes are invalid, but you should check shakes on balance staff , pix of balance pivots and both lower and upper setting housing helps.

Rgds

 

[Gaus]

Oké, thank you very much.

[JohnR725]

On 10/3/2024 at 1:11 AM, Gaus said:

It is a Seiko Presage with a caliber 4R36B.

it's a interesting watch caliber because when you go to the higher-end Seiko's finding technical information and parts might be a bit challenging. in addition to the fact that the B series is usually an upgrade to A series and usually has different parts conceivably even the mainspring and barrel.

On 10/3/2024 at 1:11 AM, Gaus said:

Seems to me not a normal serviceproblem

then has the watch recently been serviced? then regarding servicing you should look at things like the balance jewels can you see any lubrication in there? Can you see any lubrication on the watch. 

 

[AndyGSi]

I think you'll either have to try measuring it and see if you can get a generic replacement or just get a complete barrel with spring.

Edit

Not 100% the problem is just the mainspring but you'll have to replace it before you can go any further.

Edited October 4, 2024 by AndyGSi

[Gaus]

yes I already have ordered a new mainspringbarrel complete.