Eta 2892 escape wheel for Omega 1120

[hofnerpres]

Hi all. Just had a tricky Omega 1120 fault find after the click spring moved and jammed up the winding. Sorted that and then struggled to spot the slight dishing on the barrel top which took out the arbor end shake and probably caused some restriction on the mainspring. I serviced this watch a year ago and my friend has worn it happily all the time. Working tired this time l snapped the escape wheel pivot - idiot. I’ve tried a generic 2892 wheel and it’s running at 180 amp ish. Can anyone say for sure that this part is not the same for both movements ?

[nevenbekriev]

In You place, I wouldn't count on tricky tables data and somebody's else miss of success to do this replacement. As the both movements are in You hands, You are the one that can say if such replacement is possible or not.

You don't say anything about if the new wheel rotates free and the endshakes are normal. And, You don't say if the new wheel interacts with the lever as it should.

I would compare the width of the pallet stones of both levers and the slope of impulse planes. If no difference notised, this will generally mean, that if even there is difference between wheels, readjustment of pallet stones position would be able to bring the things to normal.  If there are differences, then may be replacement of the table of original wheel on the pinion of generic one is possible, or replacement of the lever with the generic one, if it interacts with the balance as it should...

[JohnR725]

For questions like this I like the look at a website like the link below where we can cross reference parts to see what they're compatible with or not. You'll see a reference that not everything is compatible with the generic. But looking at the second link for the escape wheel it looks like it is compatible.

http://cgi.julesborel.com/cgi-bin/matcgi2?ref=OME_1120

Escape wheel cross reference

http://cgi.julesborel.com/cgi-bin/matcgi2?ref=[\_DXGZK

10 hours ago, hofnerpres said:

I serviced this watch a year ago and my friend has worn it happily all the time

Out of curiosity service did a year ago and why are you servicing it now? Did it develop a problem?

[hofnerpres]

Many thanks for that detailed reply. Yes I’ve checked the wheel has good endshake and all the other fitments. Under the microscope the pallet actions look normal and both wheels appear the same. I can only measure simple diameters. Jist need to know if anyone had tried the this swop since findind a 1120 wheel will be expensive and difficult compared to the comonly available 2892 version.

Many Thanks for that John. In answer to your curiosity it came back with a windind problem and timekeeping issue - bit slow. I found the click spring in the bridge had partially dislodged and was causing plenty of trauma. No evidence l could see why this should have happened since all was tight. and free to move. I’ve done a couple of these. before with no trouble but it’s. ot the most robust design. Watch is 20 years old.