Omega Speedmaster 3861 post service accuracy problem

[ninman]

So I just got my 3861 back from a service, and pre-service it was very consistently averaging between 3.5 and 4.5 seconds a day.

Now the accuracy is fluctuating wildly and averaging out to around 8 seconds a day.

I haven't changed my lifestyle or habits in that time. Should I take this back to Omega to get them to fix it?

 

[YY77]

I would first try and see the positional variation by winding it fully, resting it in every position for 24 hours so you can see after 6 days how it performs.

 

[GrouchoM]

Multiple measurements in one day are not beneficial unless the watch is gaining or losing a lot of time per day. On average, your watch is gaining roughly 5 Seconds a day (20.8sec gain in 4 days). I would continue to wear it, winded daily, and measure daily. You could also try leaving it for 24 hours in each of the six positions to see how it performs when it's static.

 

[ninman]

It's averaging about 7-8 seconds a day. By comparison here's how it was prior to the service.

Note, I have not changed my wearing habits, I wear the watch all day, including when I sleep, so there's a clear difference.

 

[YY77]

N ninman

It's averaging about 7-8 seconds a day. By comparison here's how it was prior to the service.

Note, I have not changed my wearing habits, I wear the watch all day, including when I sleep, so there's a clear difference.

But the Omega printout you got after the service is within specs, isn't it?

 

[ninman]

YY77

But the Omega printout you got after the service is within specs, isn't it?

They didn't give me a new print out after the service. Only a list of replacement parts. I don't know if they retested the watch.

 

[YY77]

N ninman

They didn't give me a new print out after the service. Only a list of replacement parts. I don't know if they retested the watch.

Should have been done incl. a pressure test to pass QC.

 

[ninman]

YY77

Should have been done incl. a pressure test to pass QC.

How do I see the results of that? The only thing I can see are the original tests when the watch was made.

Also, on its original test it averaged 4.1s/d, which is pretty much what I got from my normal wearing habits.

 

[YY77]

N ninman

How do I see the results of that? The only thing I can see are the original tests when the watch was made.

Also, on its original test it averaged 4.1s/d, which is pretty much what I got from my normal wearing habits.

I got a print out of the WR test and accuracy after service, you should call your AD/OB/OSC.

 

[ninman]

OK, I will call and ask tomorrow.

 

[ninman]

I called, they said they don't have the test results right now, but they'll get back to me when they find it.

 

[ninman]

So Omega told me they got 3.1 s/d when they tested it. I said I'm getting 7-8 s/d, so they offered to take the watch back and regulate it for me again.

I'm thinking it might just be that when I wear the watch it's spending most of it's time in a fast position.

I'm going to get it regulated anyway though, because 7-8 s/d isn't really good enough for me.

 

[YandB]

That wild bother me to be honest for a 3861.
My 1863 and 321 do like +12-15 but I forgive them because they are old design movements. The 3861 should be 0-5

 

[ninman]

Y YandB

That wild bother me to be honest for a 3861.
My 1863 and 321 do like +12-15 but I forgive them because they are old design movements. The 3861 should be 0-5

Exactly, which is what I was getting prior to the service. Plus the crown is making a weird creaking noise when I wind it. It was doing that before and it sounds like it's still not fixed.

So it's definitely going back.

 

[Canuck]

My calibre 863 from 1990 consistently runs -1 second per day, worn 24 hours. I serviced it myself January 2023. Pretty good for a 34 year old watch, I’d say! You won’t likely be happy until your watch performs at least as well as did prior to service. (My Rolex calibre 3135 is within one second in the last 20 days!)