Martin sent in this 1990 Rolex for a service. It has the calibre 3135 movement, which is Chronometer certified. It has 31 jewels, and is beautifully made. You will see in a bit why I’m saying that…
There is a bit of a beat error, and the movement is slightly fast, but nothing to worry about.
First look at the 3135. You can see that there is no regulator. The beat rate is adjusted with little nuts on the balance, moving the centre of gravity inwards or outwards.
Date and hands are in great condition.
The date dial. Everything nicely decorated.
The auto winder.
Now we get a clear view of the base movement.
The gear train is visible now the wheel bridge is removed.
Just the barrel bridge left. The brass lever on the left is the stop lever for the hacking second feature.
Top plate cleared.
The mainspring has a bit of solidified grease on it, and I will of course put in a new one.
The bottom plate with the date ring removed.
I love that little jewel on the date change lever. It rolls against the excenter on the date change wheel, keeping friction to a minimum. This isn’t over the top – it’s a chronometer movement, and any avoidance of a change of the beat rate helps. The less friction on the date change, the more constant the beat rate.
Ready for the cleaning machine.
The parts that get epilame treatment.
All parts ready for reassembly.I spread a tiny amount of braking grease on the barrel wall, to make the slip of the mainspring as controlled as possible.
The new mainspring can now go in.
Then I oil the cap jewels and put them in.
I start off with the barrel and barrel bridge.
Then I put the gear train back in.
Once the pallet fork and balance are in, the movement starts beating.
Now it’s time for adjusting the movement.
This little key is used to turn the adjustment nuts on the balance. You always have to turn opposing nuts in the same steps, as otherwise, the balance would be out of poise.
The beat error is corrected, and with +3s/day dial down, I am as close as I can get to 0s/day as an average of all positions.
I put the auto winder gears back together. The reverser wheels were epilame treated to avoid seepage of oil onto the ratchet mechanism.
I can now turn my attention to the bottom plate.
The photo is a bit blurry, but I wanted to add it as it shows the little round jewel on the date changer wheel in action.
The date ring in place, and the movement is ready.
New gaskets for the pendant tube, crown and base back.
The movement cased without the auto winder bridge.
Auto winder bridge and oscillating weight in place.
Movement cased and looking great.
Dial and hands are in great condition.
Waterproof testing, and all is well. No pressure loss within a minute.
The bracelet is back on, and all it done.
I know how Rolex watches divide the world of watch lovers, especially those on the Omega side of things. Whatever you think about the design, you can’t fault the movement. The 3135 is a super chronometer certified movement, a great performer, and beautifully built.