Revision of a caliber Junghans J82; Junghans 682.70

The watch in its found condition

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Junghans J82; Junghans 682.70; Front

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Junghans J82; Junghans 682.70; movement

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Junghans J82; Junghans 682.70; Front

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Junghans J82; Junghans 682.70

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Junghans J82; Junghans 682.70

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Junghans J82; Junghans 682.70; detail dial

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Junghans J82; Junghans 682.70; detail dial

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Junghans J82; Junghans 682.70; detail dial

The found condition of the watch could give rise to hope, although the movement was not running it was at least the setting of the hands that was in function.

After removal of the glass there was a lot of dirt.

The hands - lots of rust

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Junghans J82; Junghans 682.70; dial

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Junghans J82; Junghans 682.70; hands

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Junghans J82; Junghans 682.70; dial with removed hands

Although the luminous material of the hands was still intact this had to be completely removed, at least to some extent to free the hands of rust and corrosion. Unfortunately, I still have no way to gild the pointer again so I have this worked only superficially.

After the hands were removed the entire dirt on the dial was visible. Earlier watchmakers had left sufficiently their tracks already. Unfortunately, some scratches were observed.

 

The next step - relaxing the mainspring

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crown wheel and ratchet wheel

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removal of movement

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removal of movement

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dirt everywhere

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dirt everywhere

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missing luminous dots

On the visible screws of the movement also quite a few watchmakers had engraved themselves and maltreated the screw slots with non-matching screwdrivers.

To protect the balance staff, I first wanted to wind down the mainspring. The winding of the movement could be not a millimeter to move on and I suspected that the spring was fully wound up.

The winding stem was so tight that the force was not transferred to the ratchet. So I decided to remove it right away. Here, the ratchet wheel must be fixed so that this could not abruptly transferred the then unrestrained power of the mainspring to the wheel train.

But again after removing the ratchet nothing moved. The spring wasn`t raised a bit.

The movement stuck very firmly in the case and had to be pushed back by cautious pressure on the dial. For this I put some thin plastic sheet to protect the dial. Even now, again there was a lot of dirt on the sides of the movement and of the dial. The radium luminous dots at 3 missing completely, at 2 it was only half present.

Old fashioned but functional - the dial mounting

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Zwischen Kloben und Brücke: between cock and bridge: the dial fixture screws

The Junghans J82 was built in 1951 and of course designed previously. In this time were sometimes even the old-fashioned fixing screws to be found, which are accessible from the movement side. Later, the dial feet were fixed with side-mounted screws.

Oil spill

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dial bottom

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dial bottom

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dial bottom

The next problem of this watch came to light - an oil spill. Probably the movement was (as now) not in the hands of a watchmaker but was edited by a non-professional. Extremely generous oil was distributed throughout the movement, under the now remote dial is found size oil spills.

Oil everywhere...

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movement dial side

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movement dial side

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movement dial side

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balance wheel with cock

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Anker mit Brücke; pallet with bridge

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pallet with bridge

Of course, on the movement oil was generously distributed. Advantage: the movement is well preserved and the existing rust damage could not continue. Disadvantage: everything is gummy and bonded...

After superficial inspection the balance stuff (balance wheel with cock and pallet with bridge) was removed. The Junghans J82 has a pallet with bridge, not with a cock.

Tooth loss!

The dismantling proceeds

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disassembling of the crown wheel

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gear train

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disassembling

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disassembling of the ratchet wheel

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disassembling of the ratchet wheel

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tooth loss

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broken tooth

The dismantling proceeds and hence debugging why the movement was not running and has not let wind up. Also under the crown wheel is a whopping oil puddle.

At Junghans watches usual: barrier and crown wheel have a left-hand thread.

After removing the wheel bridge the gear train is inspected. Except dirt here no damage appears to be.

Then I found the next damage: the ratchet wheel has tooth loss! The tooth came only during the dismantling of the clutch wheel and the winding pinion to light. He may have been responsible for the blockage of the winding mechanism.

A replacement movement was eviscerated

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replacement movement

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ratchet wheel

Luckily still was a replacement movement (a J82/1 with a broken balance pivot) in my small parts fundus and this also had a (unfortunately rusty) ratchet wheel!

Dismantling continues apace...

Oil, oil, oil...

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disassembling

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disassembling

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disassembling

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disassembling

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disassembling

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disassembling

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disassembling

The rest of the disassembly of the movement was a constant struggle against dirt and to much lubricant.

Short reassembly of the balance stuff

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balance staff

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shock protection of the balance

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disassembling

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disassembling

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disassembling

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disassembling

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disassembling

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disassembling

To remove the shock protection of the balance pivot, I mounted it with the cock again briefly at the movement. Again, so much oil has been used by the predecessor that the Rodico for fixation the shock protection spring was fully filled with oil.

Once all the pieces were removed the parts could be placed in the basket of the cleaning machine according superficial pre-cleaning.

After cleaning

The mainspring has wound in again

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spring winder

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mainspring

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mainspring with barrel

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barrel cover

After repeated post-cleaning first the mainspring was wound with the spring winder and pressed in its barrel.

The barrel is lightly greased.

Rust removal

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assembling

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assembling

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assembling

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assembling

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assembling

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assembling

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assembling

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assembling

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assembling

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assembling

At a few places the main palte, especially in the area of the winding stem was a little rust corrosion which I removed with a fiberglass pin. Unfortunately, this gilding was also slightly decreased...

A little fauxpas...

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assembling

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assembling

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assembling

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assembling

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assembling

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assembling

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assembling

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assembling

As the balance staff was assembled, remained strangely two screws left.

Where these came within ?

It was the pallet bridge!

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assembling

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assembling

The pallet bridge! Here I had forgotten the two screws to screw.

So the balance staff had again to be dismantled to insert the screws permanently.

The final

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minute hand

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hour hand

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hands

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dial

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dial

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luminous material

After the movement was completely again it allowed a "naked" trial run over night, then it went to the finish. Dial and hands were cleaned, as good as I could. As mentioned at the beginning of this article I would be happy if I could gild hands new. That left only to clean them gently (unfortunately, the rust was still good to see) and provided with new luminous material that I had easily dyed.

The luminous material has become my a bit too pink. I try to adapt the luminous material to the color of old luminous mass of dots. Also, the luminaire - dots at 2 and 3 have been replaced.

Done!

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Junghans J82; Junghans 682.70; Front

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Junghans J82; Junghans 682.70; movement

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Junghans J82; Junghans 682.70; movement

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Junghans J82; Junghans 682.70; movement dial side

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Junghans J82; Junghans 682.70; back

The Junghans J82 ; Junghans 682.70 is pleasant to repair. All screw heads are large and all parts extremely precision-manufactured.

Not for nothing there is this movement also in chronometer quality with fine adjustment.

Addendum

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result on time machine

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result on time machine

The first test runs of the watch went first very strange for me. The watch runs partially perfectly, but with a very high amplitude (often more than 330°) despite a drop error of about 2 ms. This led irregularly, usually after about 20 sec. to a completely chaotic picture on the time scale. This happened especially with dial up or down. In the positions (for example, crown below) chaos was rarely observed.

After I had sent this photo (first picture) of the bad result to my watchmaker he mentioned: the ellipse of the balance bounces at the anchor if I had understood correctly. Triggers may be a too strong mainspring or the clock has to only work for a little and is running "too good".

The mainspring I initially did not want to renew and I decided just to wait a few days and in fact the phenomenon has been done largely and the watch is running very constant (second picture) now.