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sstakoff

Cartier/Ebel 81 - Cleaning Advice

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So a friend asked me to change the battery on his wife's Cartier Tank Quartz. It has a Cartier/Ebel 81 movement which I believe to be equivalent to the Frederic Piguet 8.20  calibre. As it turns out the watch was subjected to moisture in the past and the battery was also corroded :(. A new battery didn't fix the issue - so I decided to clean it. Upon disassembly one of the battery strap screws was corroded into place - it took some creativity to wrestle it out. But now, careful inspection seems to indicate that the 2 strap screw posts are actually fit in place with what looks to be either a black plastic or rubber washer or similar fitting - presumably as an insulator. I cannot clean the main plate in the ultrasonic with these plastic/rubber seals in place. Can someone please confirm that this is indeed what I am seeing and offer any advice on whether I can safely remove these fittings (and how). I am reluctant to just start pressing them! 

This image shows the "stuck" strap screw. Notice the corrosion around the battery area and near the removed strap screw hole as well.

DSC_1052.thumb.JPG.1de8b371d4015400959bf55680bc1297.JPG

 

Finally got the screw out!

DSC_1064.thumb.JPG.c0a9689b94fde6a3c7128afbfddffcf3.JPG

 

You can see the black inserts below.

DSC_1065.thumb.JPG.8b97509fdc3c01610ec9974d6b1366f2.JPG

 

Here's a view from the dial side:

DSC_1062.thumb.JPG.0ed5bcda051aeea0365686b2851697f1.JPG

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I'd be concerned about the EB, moisture ruins it or the circuitry pulls excess current which runs the battery down in couple of months.
Regards

EB??


Sent from my iPhone using Tapatalk

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8 hours ago, JohnR725 said:

I am attaching the technical brochure which has some information on cleaning.

820p.pdf 193.05 kB · 1 download

This is very helpful - has a bit more detail than the other docs I have. So - we now have this movement being equivalent to the Cartier 81, Ebel 81, Frederic Piguet 8.20 and the Piaget 820P :). 

I am still very surprised by the cleaning instructions in the Piaget document. They explicitly state that you can clean the main plate conventionally. But I am certain that there is an insulator between the battery strap screw tubes and the main plate. I cannot imagine they would not be substantially damaged by watch cleaning solutions. This movement requires the + side of the battery to be placed down and make direct contact to the main plate. So the strap is negatively charged and must be insulated from the main plate. I am curious if anyone here has actually cleaned one of these in a cleaning machine. I am heavily leaning towards my prev thought which was to clean the main plate in my water-based jewelry ultrasonic instead of the Watchmaster.

Edited by sstakoff

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