Omega cal. 30T2PC Incablocks

Alex_CM · Jan 28, 2025

I’m wondering if anyone here knows the answer to my problem. I’ve performed a service on a cal. 30T2PC, and when the balance side is facing up, the watch measures perfectly. However, when I flip it so that the dial side is facing up, the measurements become very erratic.

I’m wondering if the jewels might somehow be installed incorrectly, or if this caliber’s jewels are identical and interchangeable, or if they need to be in their exact positions? Could it also be an issue with the balance spring? I’m lost.

M'Bob · Jan 29, 2025

Maybe post in the watchmaking section?

Archer · Jan 29, 2025

Alex_CM
I’m wondering if anyone here knows the answer to my problem. I’ve performed a service on a cal. 30T2PC, and when the balance side is facing up, the watch measures perfectly. However, when I flip it so that the dial side is facing up, the measurements become very erratic.

I’m wondering if the jewels might somehow be installed incorrectly, or if this caliber’s jewels are identical and interchangeable, or if they need to be in their exact positions? Could it also be an issue with the balance spring? I’m lost.

Partial list of possible issues...

Cap jewels interchanged (upper and lower are different - they often are).
Mushroomed pivot from impact
Worn pivot
Worn cap jewel
Clearance issue with balance and pallet fork
Balance spring fault - improperly adjusted and possibly rubbing on the underside of the balance cock.
Improperly cleaned balance jewel
And likely lots of others that I can't think of off the top of my head.

This is where the rubber meets the road in watchmaking. If you clean, assemble, oil and everything goes well you think "Wow, isn't this easy!" But when things go wrong there's rarely just one single cause for it, and that is where a detailed process of elimination is helpful to diagnose the issue. It's something I recommend that anyone taking this up (amateur or professional) should have developed so they ensure that steps aren't missed.

Omega cal. 30T2PC Incablocks

Alex_CM

M'Bob

Archer

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