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Diagnosing problems from Timegraph results


Question

As a noob, I've serviced a Longines watch recently but there are a couple of issues I have noticed when putting it on the timegrapher (screenshot attached):

1) There is a variation that occurs every 5-6 seconds - what could be the possible cause?

2) The amplitude, although much better than before the service, is still low - again, what could be the cause/s? 

The servicing included a complete strip-down, cleaning all parts, reassembling and oiling.

 

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Thanks Joe.

 I found that when I applied some pressure to the barrel (in clockwise direction with DD), I could get the amplitude up to well over 300 degrees. 

As said before, I don't have a spring winder but I am prepared to have a go at removing, cleaning and manually attempting to wind it in before purchasing a new spring. Is this the way to go or is has the spring lost it's tension? Incidentally it was still running at 40 hours.

 

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10 hours ago, Bonzer said:

Would it also be correct to say that the rest of the train not as influential when it comes to power?

Everything in the watch can be an issue.

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4 hours ago, Bonzer said:

Thanks Joe.

 I found that when I applied some pressure to the barrel (in clockwise direction with DD), I could get the amplitude up to well over 300 degrees. 

You have over-powered the fault that exists in escape wheel area.

The fault is still there to be found, weak mainspring doesn't explain the periodic fluctuations you saw.

Friction steming from the fault prevents MS's free power flow pass the escape wheel.

I look for cause of the fault in escape wheel area.

Good luck

 

 

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In response to the possibilities mentioned in the last few posts, I stripped the watch down again and took a closer look at the wheels and jewels. 

As far as I can tell using a x7 loupe, the escape wheel/pinion/pivot is fine. Pivots don't seem bent or rusted. The pinion seems in good shape. The same is true of the other wheels. 

I cleaned the pivots using pithwood, pegged out all the jewels again reassembled and re-oiled. At the moment, after 12 hours of operation, the amplitude is around 215 degrees and the variation is still slightly there but far less pronounced.

The amplitude prior to any messing around with this watch was about 144 degrees DU/DD so it has improved but still not enough 😞

I wonder whether I should really be investing in an ultrasonic cleaner to get better cleaning.

 

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