Rebuilding a GMT 2

[GenTLe 1,510]

I recently got a Noob GMT 2 kit from a guy over rwg.cc. It was complete except for the DWO and 3 of the 4 parts that turn a standard 2836 into a GMT. Plus it was completely disassembled.

 

Going to show the rebuild process.

 

First I unassembled the movement (and it is when I discovered that the GMT parts have been replaced with standard ones, except for the gmt hand gear/pinion) and properly washed it.

Here after first rinse:

 

And second rinse (between the temporary allocation over lint free paper and the passage in the 50°C oven I use to dry them):

 

In the meantime I got a brand new BK dwo from USA that I will glue over the naked date wheel.

 

(to be continued)

[GenTLe 1,510]

Here you can see what transform a standard 2836 into a GMT version, together with the higher cannon pinion:

Below the GMT bits, upper the standard ones.

 

Here together with movement partially assembled:

 

Finished (missing only the GMT hand gear and the BK DW overlay which will be done when I will be fresher than like now ar 11pm):

 

 

Definitively not bad for a movement not yet regulated! Lovely amplitude and 0 beat error

 

(to be continued)

[Robin195959 2]

Interesting project buddy. What are your plans for the case, dial, hands, crown and bracelet?

[GenTLe 1,510]

I have all (Noob ceramic version), not a real project, practically a watch bought disassembled

[GenTLe 1,510]

This eve I have installed and glued the dwo that BK has been so nice to sell me on the naked date wheel.

 

Here you can see the result. For the alignment (that I have obviously checked) pictures we need to wait tomorrow.

 

The glue I've used is in the pic.

It has 2 big advantages respect to the others:

1) when it's dried it keeps 300kg/cm2, this means that I can use a VERY little amount of it, placed with an oiler on just 4 points of the DW. This will avoid it spreading around ending up on the movement and/or the DWO.

2) this glue fully dries in 12h and if you put a low amount of hardener it remains very soft for more than 1h (at least for more I needed to align properly the DWO). This means precious time to use for alignment!

 

Plus I used that glue to fix a magnet of the flying wheel of my motorcycle, and after 20kkm spinning up to 12000rpm in hot oil and with the V-twin pulses the magnet is still there

[kennycoder 97]

Great writeup GenTLe!

[Daywatch 4]

Amazing skills. Awesome, thanks for the pics:)

[GenTLe 1,510]

Thanks guys but nothing someone with steady hands and a bit of passion for mechanical works (and some movement to sacrify while learning) can't do

[GenTLe 1,510]

Check of DWO alignment: love it!!

 

[Foxindebox 472]

looks good mate

[NCRich 13,792]

Great work!

[JSJ 0]

Top job mate.

 

Where are you sourcing the GMT parts?

[insert-here 0]

Super! keep it coming.

[GenTLe 1,510]

Top job mate.

 

Where are you sourcing the GMT parts?

Old movement of my 1st gmt rep that I destroyed because of a fall.

Helenarou has full movements too

[deju 1,889]

Great skills, worth the patience with the date wheel for sure!

[JSJ 0]

Top job mate.

 

Where are you sourcing the GMT parts?

Old movement of my 1st gmt rep that I destroyed because of a fall.

Helenarou has full movements too

OK thanks mate.

[trailboss99 996]

Nice work mate!

[GenTLe 1,510]

Nice work mate!

Thanks Boss!!!

[GenTLe 1,510]

Hands alignment done!

 

[GenTLe 1,510]

In the case:

 

I also leaned something today: if your movement is performing amazingly half assembled and, after casing, it starts to behave erratically with ridiculous amplitude (197°) and very inconsistent gain/delay, then check the sec hand! Mine was nearly touching the crystal and it was causing this stupid behavior

Once I pressed it a little bit more into its pinion it went back straight to the results of the pic:)

[Odyseus 1]

Nice work Setting the hands is a real pain on these as the GMT hand is bent very slightly upwards and all hand spacing is very small

[GenTLe 1,510]

Nice work Setting the hands is a real pain on these as the GMT hand is bent very slightly upwards and all hand spacing is very small

Actually I don't find them so difficult. You just need to find the date switch moment, put the GMT one, then charge the watch and position the GMT at 59min, wait it arrives to 00 and fit the hour hand and then the rest.

It is important to let them to reach the 00 powered by the movement (and not with the crown) because the play the gears have will result in a misalignment, when watch will run, if you rely on crown positioned hands.

About the clear they must have, an attention look with the loupe from the side will help

Worst are the chrono ones in my opinion. Especially when you need to take the hands off (and bloody tube of chrono sec hand stays on thè pinion...)

[Sakurai 1]

Hugely impressive and very interesting, thanks for sharing mate!

[GenTLe 1,510]

Ok so how to relax oh a Sunday afternoon after a good MotoGP race (even if it has been very sad for Rossi...)? Move on with the GMT is a good idea

 

Since the watch has been bought in bits and I don't know the story behind apart being it a Noob, a good idea is to remove the bezel and give a good clean to its parts:

 

That way I will also be able to give a repolish to the surfaces without messing up with the bezel mechanics.

 

Lubricating the bezel assembly with oil or grease isn't a wise move, because in some time they will end up in a kind of dirty paste as oily materials attract dust and incorporate it in the lubricants.

So I used my dry Teflon spray, spraying it in a bowl and using a brush to apply it.

When the solvent will be evaporated, it will just leave a thin layer of dry Teflon on the surfaces, reducing a lot the friction.

 

Then some attention to the bracelet. Rebrushed and repolished where needed:

 

Then a good clean in the ultrasonic machine, rinse with hot water and remount/resize it.

 

And finally:

 

Kind of happy of the result

[Daffy 105]

Wow, that's some fantastic work. I wish you lived in Florida, I would bring you projects continually...