Looking for data on Omega Micromotor for f720

T Tonydg

Hi,

It has been a while since I posted anything, and since then I have got an Omega Megasonic and had it expertly repaired by JackDaniels83 (many thanks to him for the time and effort he put into the repairs) ...

One item he replaced with the tuning fork with the micromotor, so now I have a spare to play with.

I am now trying to find out information about the oil used to fill these.
Is there anyone out there who knows the oil type and/or properties?

Looking on the back of the micromotor housing, there are a couple of indents which I wonder if they were the fill hole (and air bleed hole) when the finished assembly was lubricated....

Can anyone shed any light on these?

Thanks,
Tony

Uscjake87

I am interested in this topic. I have heard from many folks, including JackDaniels about the perils of gummed up oil in these micromoters. I have a parts megasonic that is rather beat up, but a fresh dial, hands, and service could revive it. The big issue is always the micromoter. I remember reading on electric watches UK site that even NOS micromoters have dried up oil.

Foo2rama

For the record a watch for sale with an opposite issue is for sale on this forum...

JackDaniels83

Hi Tony, nice to hear from you and see your watch.

My own experiences are:

The oil is very thin, the motor case is sealed by some sort of glue. If it's not 100% sealed the synthetic oil evaporates over a period of decades. I think the bores that are supposed to be for fill up are the small one top right and bottom left, because in that areas there are often small air bubbles left. I would use Moebius 9010 if I wanted to try a refill, but at the moment there are a lot of new forks and motors available. As long as this is the case, it does not make sense to try to refill.

I have approx. 200 new motors that I'm able to glue to used or new forks. I check them using a microscope, to see if the oil is still in there. After that I will run the fork on a known working test movement for some days.

JackDaniels83

Hi Tony, nice to hear from you and see your watch.

My own experiences are:

The oil is very thin, the motor case is sealed by some sort of glue. If it's not 100% sealed the synthetic oil evaporates over a period of decades. I think the bores that are supposed to be for fill up are the small one top right and bottom left, because in that areas there are often small air bubbles left. I would use Moebius 9010 if I wanted to try a refill, but at the moment there are a lot of new forks and motors available. As long as this is the case, it does not make sense to try to refill.

I have approx. 200 new motors that I'm able to glue to used or new forks. I check them using a microscope, to see if the oil is still in there. After that I will run the fork on a known working test movement for some days.

JackDaniels83

Hi Tony, nice to hear from you and see your watch.

My own experiences are:

The oil is very thin, the motor case is sealed by some sort of glue. If it's not 100% sealed the synthetic oil evaporates over a period of decades. I think the bores that are supposed to be for fill up are the small one top right and bottom left, because in that areas there are often small air bubbles left. I would use Moebius 9010 if I wanted to try a refill, but at the moment there are a lot of new forks and motors available. As long as this is the case, it does not make sense to try to refill.

I have approx. 200 new motors that I'm able to glue to used or new forks. I check them using a microscope, to see if the oil is still in there. After that I will run the fork on a known working test movement for some days.