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Remove the Omega Speedmaster Professional 861 movement from the case - crown stem removal

28K views 18 replies 16 participants last post by  iamaracinghorse  
#1 · (Edited)
Hmmm, fun thread title! Just wanted to share today's madness, and maybe get this indexed by big G for posterity.

Introduction to me - watch newb, been collecting for 6 months, basically a keen amateur. I have a '67 Seamaster, a SKX009, a '64 Smiths Astral, an Ollech and Wajs M1, and a Steinhart Ocean GMT.

Also, last week I picked up a 1991 Speedy Pro from the bay of evil. For ÂŁ1350 I'm pleased; to my eyes it's lovely and even though I'm not sure of its provenance (can any of you experts tell me with certainty that the dropped-S Speedmaster logo on the dial is correct for a '91 watch?), it's a Speedmaster. I'm happy. I even love the 1479 bracelet now even though I thought it was a bit of sleazy Seventies-looking item at first!

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However, one thing irked from the start - a 5mm long piece of fluff on the inside of the crystal (can you see it? under the '30' on the minutes subdial).
Even though my wife claimed it's not worth worrying about, it began to haunt me. Every time I looked at the watch it was there, goading me!

Anyway, today I got hands-on and sorted it out. Let me share my experience. First of all, I warn anyone thinking of doing this that YMMV - every time you get the back off a watch you are inviting trouble.
Dust motes, sneezes, fingerprints, errant hairs, upturned glasses of squash. Literally anything can and will happen when you take the back off your pride and joy.
However, I'm cheap and have insane self-belief (and steady hands) , so I figured I could do it myself rather than sending it off or trusting it someone on -shudder- the high street. After all, I took the back off a Seiko 5 once - what's the difference? ;)

Seriously though, I don't feel a watch is truly mine until I've had a good look at its innards, even if it means leaving tiny scratches from my inept bumbling. Watch snobs look away now, as I'm about to apply some medievally amateurish technique in a quasi-sacrilegious fashion!

First off, the tool kit - as stated I'm a newbie and a skinflint, so:


Secondly, the working environment. I try and make sure I have at least half an hour of un-interruptable time to do this open heart surgery. I set my chair as low as it will go, turn the lights on and put a clean dark cloth down as my work surface.

So - to get a piece of fluff or hair off the inside of a Speedmaster crystal - do this:

  1. Remove the bracelet using your springbar remover. It helps if your lugs are already scratched to buggery like mine, so I don't care about the inevitable damage my cheapo efforts will do.
  2. Remove the caseback using your 3-pronged caseback tool. Even I'm not cavalier enough to try it with a 2-piece tool / pair of scissors (!) etc. as seen on YouTube...

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3. Remove the inner antimagnetic shield by simply lifting out - I've read tales of using screwdrivers etc. to prise it out? Bad luck; for me, fingers were enough.

At this point we see the lovely Lemania 1873 / Omega 861 movement. Not as nice as a 321 but hey, I'm not *that* rich!

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Seriously, that looks like yellow gold - is it? When did they stop gilding it? IMO the 1861 doesn't seem as nice. Such a shame for something so beautiful to be hidden from view.

Anyway, this is when you have to get courageous. To get the movement out of the case, the crown stem has to come out. It's held in by that TEENY TINY screw indicated by the arrow above.
My 1mm screwdriver was adequate for this task. 2 and a smidge turns anticlockwise were required, at which point the crown and stem could be slid out like butter.
If you're having to force it, that screw needs undoing just a little bit more!

Note that the chrono pushers don't have to be unscrewed or anything. They're not physically attached to the movement.

At this point, I felt perilously close to brown-trousers time. I could see that the movement was now free in the case, so I loosely held a piece of card to the the back of the watch and quickly inverted it (so crystal now facing up).
Placing the card carefully on the table, I could now lift the case, leaving the movement behind.

Tip! I quickly covered the exposed movement with an upturned whisky tumbler to save it from dust / hair / breakfast contamination.

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After that, getting the fluff out was easy with my dust blower. In classic Steptoe fashion I also gave the inside and outside of the hesalite crystal a quick polish with some sensodyne - only the best for my watch, ho ho ho! I have no Polywatch in the house. Shame. Incidentally though I can verify that toothpaste did improve the scratches, and also left my watch minty fresh! A quick rub with a clean j-cloth got rid of any residue.

Re-assembly was just a reversal of the process. There was a heart-stopping moment on completion when I noticed that the second-hand subdial had stopped (that's right folks, I don't know if/how you should stop a working movement when removing it), and winding the watch normally was setting the hands! Aaargh! However, I pulled the crown out, pushed it in again, and everything was magically back to normal. Ah, the appliance of science. I guess this is just part of the process of reinserting the stem.

Also, fear and blind panic is an essential part of adventure! Happy tinkering!

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That's right, it's on a buff-stripe NATO, and not a piece of fluff in sight! Watch the ladies go wild with desire!*

Zoot

* Not guaranteed to happen.​
 
#3 ·
Good job!

No, the yellow gilt contains no gold. And although the yellow gilt looks good, the rhodium plating of the cal. 1861 is much more resistant to corrosion and the movement contains an extra jewel making a total of 18.

Fr. John+
 
#4 ·
You've got balls. LOL. I have found this post very informative and a great read. Thanks for your post. HAGWE.
 
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#8 ·
Congrats on the watch and a big congrats on the work. Only done work on vintage cheap pieces. Only problem sometimes when you take the stem out sometimes it will not go back in right due to dislodge something on the dial side and that means taking the dial off and resetting it, and thats a pain.
 
#10 ·
Wow, As some have said, ".....big cahounas!' (sp?)

Loved your post and your watch!

You state it like a Noob, (forgive me please) but that is the language I understand. I feel for others that read this and are not as adept as you, (self included) and actually attempt this, especially without your 'steady hands' and insane self belief. But, like you, once this piece of fluff was noticed, I would not have seen anything else once I looked at the dial. (Reminds me of my wife! Sorry:-d)

You did well zootius. One of the best posts I have read from a member with single digit posts to their name. (Seriously, no patronisation intended.) By your introduction, you also have a very fine taste in horology, as in Smiths, Omega, Seiko, O & W and Steinhart. Nice. Some more pics would be great, Please.
Hope to see and read more in future. Sounds like you are in the right place.
A sincere and warm w
elcome to WUS.
 
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#11 ·
@T.Wong thanks for that information, it makes me even happier with the watch. I believe I saw some info on the ChronoMaddox site (Omega Speedmaster Dial Details) that suggested our logo style was phased out by 1989. Perhaps Omega had a large stockpile of the old dials that they continued to use on their non-special editions?
 
#12 ·
Brave man! I hate threads like this because I now know vaguely how to disassemble a Speedy if I ever get one and in my case, a little knowledge is a dangerous thing. Usually goes something like this, "I'll just tighten it a little more, just a smidge to be certain. There we go...snap, dammit dammit dammit!" ;-)
 
#13 ·
Thanks Mark - sounds like you have a fine collection there! There's obviously gold in them thar nuts ;)

I've always admired watches ever since my Dad bought a Rolex DateJust in the early 80s. I wore nasty quartz myself until my Dad unexpectedly gifted me with a lovely 1967 Seamaster a few years ago (see here for my blogging efforts on this).
It was my pride and joy but when I sent it off for servicing in January this year, my arm felt bare! And because I had just sold my other pride and joy (a 2005 Honda CBR1100XX Blackbird, sniff!) I had a few more readies than normal.

So the bug bit hard! I bought 5 watches in 5 months. Now I'm thinking of thinning it out a little and being a bit more selective....

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#14 ·
Hey Friends! Sorry for reviving an old thread here, but it was super-pertinent to my predicament. It might be better posted in the Watchmaking forum, but on the off chance anyone here can help, I figured it was worth a go.

One of the chrono pushers on for my Speedmaster (ref. 3590.50; Cal 861) came unscrewed, so I followed the OPs journey to remove the movement and screw it back on. No problem there!

Trouble is that now the stem won't stay put; it just slides in and out without catching. It feels like the "Teeny Tiny" screw the OP referenced is just spinning in place when I try to tighten it back up. I'm wondering if anyone here knows the meaning of this. I feel like I might've over-loosened it, which I hear is a "bear" to fix. I'm feeling bold though, so I'm happy to give it a shot if there's any guidance out there.

THANKS IN ADVANCE!
 
#15 ·
Yeah, good post!! And well done. I bought a watch once and ended up having to drill a screw out just trying to size the braclet, and that scared the c*@p out of me. Now coming from someone that restores classic cars, I can appreciate the risk involved, although watch parts are more readily than a lot of classic car parts you have rather large melons.
Regards,
 
#19 ·
Ah well. That's three votes for "take heed and go no further". Fair enough! I'll take it to someone who knows what's up. The Dunning-Kruger effect is strong with me :)

Thanks, @2premo, @Archer, and @watch_hor!
 
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