MITKA

Service IWC 8531

p1130384

This lovely IWC is not preforming very well. It needs a service and some general fixing… 

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Superbly decorated movement. The osculating weight is not quite level. The oscillating weight rotor post has it’s own little cock and it’s a little crooked. I later reshape the cock and it’s level again.

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Balance is hardly swinging so that reading is bogus…

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IWC Pellaton winding system is very efficient.

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Very funky date disk! Note the date disk retaining plate is missing a screw and another screw i wrong.

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Here you can see the date/setting/winding mechanism.

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Here you can see the base movement. Very nice micro regulator.

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I start taking apart the base movement.

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Here you can see the gear train layout.

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Here you can see the old mainspring.

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Movement cleaned and ready to be but back together.

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Mainspring in the barrel.

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The hairspring was a little low and touching the balance wheel hindering it’s movement. I reshaped  the hairspring and the balance moves freely.

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Case movement back together.

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The pallet impulse pin was a little deformed, giving me strange time graph readings.. Parts are not easy to get by so it ads a little stress when working on. But luckily I did not break anything.

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Finely running like it should after some hours with the hairspring and pallet fork with thoughts of jumping out the window along the way;)

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Date mechanism back in place. I have got the correct screws that were missing.

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Movement goes back into the case.

I fit the autowinder mechanism.

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Last part to go in place is the oscillating weight.

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That looks very nice!

Vintage IWC calibre 8531

Nice vintage IWC for most occasions!

2 Responses to Service IWC 8531

  1. Ben Francis says:
    January 18, 2019 at 2:17 pm

    That’s a high quality piece – very nice 🙂 …any ideas on age?

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