I love the idea of a mechanical alarm on a wrist-watch!
Day setting by pushing button now works.
So I bought a 'parts and repair' item from ebay, played around with it and then left it to one side whilst I practice on 7s26/6309 movements.
case number 150313 - May 1971?
Balance, balance bridge, pallet removed..
Alarm/winding bridge :
Rachet wheel removed from main barrel.
Bridge removed..
Third and fourth wheels removed..
Second wheel bridge removed..
Cleaned, and reassembled, new crystal and good to go! This is now my favourite watch to wear..
Now, after some practice, I'd like to have a go at the case, removing some of the dings around the bezel.
1/6/2012
Case is in pretty good nick. Given a good gonig over with water and detergent.
Crystal is badly scratched.
Dial and hands in good condition.
Removed movement - very prominant key release!
4/5/2013
Put the whole thing back together to evaluate...
Balance movement very weak.
Day setting - move hands between 9:30pm and 1:00am (from manual) WORKS.
Date setting - push alarm button. WORKS.
Hand turning. Crown in third position. WORKS.
Alarm setting. Crown in second position. Turn anti-clockwise. just clocks clockwise. WORKS.
Alarm winding. First position. Bell button IN. extremely stiff clockwise. Clicks anticlockwise.
Alarm sounding. Sounds for very short time.
Running : Several minutes an hour FAST - down to very little balance movement?
Conclusions :
Needs lubricating - crown movements feel sticky.
Balance amplitude very low - power chain needs lubrication.
Alarm winding - ??
Have bought a second movement from ebay (12.20GBP!), and a new crystal from ebay $24.45 (and a crystal press). http://www.ebay.com.au/itm/Seiko-Bell-Matic-Bellmatic-crystal-cs-4006-7000-more-/310618272313?pt=LH_DefaultDomain_0&hash=item48524ab239&_uhb=1
Old crystal came out with a nasty 'crack' sound, but undamaged. I gave the case a good clean and a polish with Cape Cod polishing cloth, and installed the new crystal. This went in fine..
Old crystal came out with a nasty 'crack' sound, but undamaged. I gave the case a good clean and a polish with Cape Cod polishing cloth, and installed the new crystal. This went in fine..
And so to the real work..
Numbers refer to the stages in the 4006A Disassembly and assembly instructions.
2. Removal of Movement
Stem and alarm set button come out easily - it's amazing how much gunk gets stuck inside these crowns!
Case spring is still in there.
3. Alarm setting wheel
I set the alarm ring to 12:00 before removal.
4.Dial
Dial shows some scuffing (not from me!)..
5. Day Star and Dial disk
No dial washer - I wonder where that went?
6. Oscillating Weight
removed.
7. Framework for Automatic Winding Device.
8. Transmission Wheel.
Lots of muck in here.
9. Ball-bearing.
Looked a bit scary - didn't do.
10. Alarm Mainspring.
Unwound, leaving this..
11. Date Dial.
Date jumper spring lived up to it's name, but luckily stayed on the desk!
12. Hour Wheel.
hour wheel still on in this photo..
13. Day and Date Driving Wheel
LEFT HAND THREAD!
intermediate unlocking wheel removed as well (bottom left of hour wheel).
14. Calendar Plate
Three screws to remove the calendar plate. NOT the one at 10:30!
Some extra bits hitched a ride..
The setting wheel rocker and the intermediate date wheel(?).
The setting wheel rocker and the intermediate date wheel(?).
15. Intermediate Alarm Setting Wheel
17. Setting Wheel Lever Complete
LEFT HAND THREAD
with it taken off, we can see setting wheel ring and wheel.
and they're out..
18. Alarm Hammer
most of it fell out earlier.
19. Unwind mainspring
done
20. Balance complete
Rachet wheel removed from main barrel.
Cleaned, and reassembled, new crystal and good to go! This is now my favourite watch to wear..
Now, after some practice, I'd like to have a go at the case, removing some of the dings around the bezel.
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