Sub loses 6 minutes in 3 hours after settin time.

[Texas1971]

Hello! Maybe the learned folks here can give some advice. Thank goodness for such great people and forum!


Allow me to describe the problem:
- Watch is set to the exact time using US Naval Observatory atomic clock
- After 8 minutes it loses 1 minute, however the second hand is exactly on time
- After one hour the watch has lost 5 minutes, but the second hand is exactly perfect
- After three hours the watch has lost 6 minutes

Here is the strange part:

- After 4 hours the watch has not lost any more time and it remains 6 minutes slow for the rest of the day
- The second hand stays on time perfectly

It seems like the minute hand gets stuck in "slow gear" for about three minutes before it gets up to speed?

Any descriptions of what is going on would be helpful. Thanks Again.
Sub 16610 W series ~1995 was just purchased used and "serviced"

[jrwerner57]

its sounds like it has a worn cannon pinion and is probably due for a servicing.

[gqllc]

yeah...what he said...

[Rikki]

ditto

[Texas1971]

Thank you. So that would make the minute hand "stick" sometimes?

[Rikki]

It's not sticking it's slipping you want it to stick consistantly. There's a certain tension on the canon pinion which is mounted on the center wheel it's what gives you the ability to actually set the hands if all the gears were directly connected you would not be able to set them. Rik

[crhfish]

I think of it like a clutch. When the watch is running the clutch holds and the hands move. When you go to set the time, the clutch allows the wheel to slip so you can set the time. Its not supposed to slip when the watch is running.