Watch Service: Omega Seamaster GMT. Cal 1128.

Omega seamster GMT

This Omega was sent to me for service for the simple reason it had been about five years since it was last serviced, it was running well and keeping good time. Sticking to the recommended service intervals often reduces the need for new parts and keeps the cost of servicing down.

The fact this watch isn’t displaying any issues will also likely make it a straight forward service with no surprises – although this isn’t always the case.

Case back removed, revealing the Omega 1128 Calibre. Its the GMT version of the their 1120 Calibre used in many Omega watches. This ones a little rarer.

Omega 1128 calibre

Movement placed into the movement holder prior to the removal of the hands.

Omega 1128 calibre

Once the dial has been removed we can see the plate below. The 1128 has an extra plate on top of the usual 1120 movement to accommodate the GMT wheel.

Omega 1128 calibre

I begin stripping the movement down, date indicator removed – along with the small maintaining plates.

Omega 1128 calibre

With the top GMT plate removed we can see the keyless and date works. Obviously a very similar set up to the Omega 1120.

Omega 1128 calibre

Just the keyless works remains on this side now.

Omega 1128 calibre

I begin work on the top side, the automatic device has already been removed. There is no discernible difference on this side of the movement from that of the 1120 calibre.

Omega 1128 calibre

Train bridge removed, revealing the train wheels.

Omega 1128 calibre

Train wheels and barrel bridge removed.

Omega 1128 calibre

Underside of the barrel bridge. This is stripped down and carefully checked for signs of wear. This part of the movement can particularly suffer once the oils dry out. This is due to the force applied through the wheels in order to wind the watch. If it gets really bad the whole bridge needs to be replaced! Thankfully this movement is fine, just a bit grubby and in need of a good cleaning.

Getting there, keyless is still in and will be next to be removed.

Omega 1128 calibre

The movement is fully stripped down and ready for cleaning.

Omega 1128 calibre

The stripped movement is carefully loaded into the baskets before it will be put through the watch cleaning machine.

Omega 1128 calibre

Fully cleaned and as pretty much always, I being by installing and oiling the keyless part of the movement. I also oil and refit the incabloc settings for the balance at this point.

Omega 1128 calibre

Building up and oiling of the top side.

Omega 1128 calibre

Movement back up and running. Jewels have been oiled, along with the escapement.

Omega 1128 calibre

I start back on the other side, GMT wheel in the centre of the movement. Its this wheel that gives us the GMT function and causes the hour hand to step forwards or backwards in increments of one hour.

Omega 1128 calibre

The GMT plate refitted.

Omega 1128 calibre

Dial side completed, black date indicator installed.

Omega 1128 calibre

One of the last things I do is build up and oil the automatic device.

Omega 1128 calibre

The dial and hands are refitted, a bit more to think about with the extra GMT hand but I go carefully and ensure everything is aligned as it should be.

Omega 1128 calibre

A final shot of the freshly serviced Omega 1128 calibre.

Omega 1128 calibre

Final checks on the timing machine to ensure everything is within tolerances.

Omega 1128 calibre

As always on water resistant models, they are tested for resistance before being returned.

Omega 1128 calibre

The watch then undergoes its standard mechanical tests, which it needs to pass before being returned to its owner.

Thanks for reading.

The Watch Professional

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