Resuscitation of a 1978 Seiko 7546-8030 - Seiko & Citizen Watch Forum Japanese Watch Reviews, Discussion & Trading
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Old 05-13-2017, 09:07 AM   #1 (permalink)
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Default Resuscitation of a 1978 Seiko 7546-8030

Hi, this is my first post, so I know nothing but I would like to learn.

I recently dug this out of my bedside drawer where it has lurked for almost 2 decades. It was a 21st birthday present, which it would be nice to resuscitate, clean up and possibly re-dial.

So I sent it to Seiko, as you do, who very quickly sent it back saying they couldn't help as it was "discontinued".

Which is when I started discovering the wonderful online world of watch hobbyists, enthusiasts, geeks or whatever and decided to join in.

Greetings
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Old 05-16-2017, 08:18 AM   #2 (permalink)
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So, first things first - I suppose initially I should check whether the battery has leaked and damaged/destroyed the movement.

However, thinking ahead, maybe I should also prepare for the best? What will I need if there is no internal destruction?

Apart from tools to open the snap on case back and a new battery, will I also need a case closer?

What about rubber seals?

According to the Seiko Casing Guide for the period, I may need one or two gaskets for the battery hatch and case back.

How do I find these? Can anybody help?
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Old 05-31-2017, 11:28 AM   #3 (permalink)
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Hi,
You'll need to get some tools to start restoring this watch and potential others! Here's what I started with-
Tweezers- #3, fine tip, non magnetic straight tweezers
Movement holder
Screwdrivers- I bought a set of $4 cheapies but I'll probably have to change to a better set. Get a Swiss set with these sizes: 80, 100, 120, 140
Case opener-two types, a blunt knife edge-type for press on cases and a three-pronged one for screwbacks (called JAXA openers).
Hands removers and setters- again, two types; lever type and Presto type. I use a lever type and a cheap set of hands pressers. They're like ballpoint pens without a refill.
Loupe- a 5X quality loupe (Swiss) will be a best for general work.
In addition to these, you'll need silicon grease for the gaskets and a digital caliper (a vernier caliper with a digital readout) to get precise measurements of gaskets and other parts. I just measure the recess where the gasket sits (inner and outer diameter) and buy them from cousins (cousinsUK.com).
If there's no internal damage, disassemble the watch and clean the case. Hope this helps!
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Old 05-31-2017, 03:13 PM   #4 (permalink)
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I'd suggest starting small and not overdoing it on tools - buy them as you need them. A case knife will get the back off, and a set of tweezers will help get the battery in and out. A cheap case press isn't a bad idea to get the back snapped back on, but you may not need it - it's much more necessary for installing new crystal. I'd start with that and see how it goes. The 7546 is a very robust movement - it may fire right up; it may have dried oil or battery leakage in the gear train (you'll definitely need more tools to fix this ), and worst case scenario is a bad coil or circuit board. 4 out of 5 times (in my experience with 7546/8s) a new battery will do it.

Gaskets - this has a snap back and a battery hatch? The caseback gasket for your watch is part number DB2915B01 (which has been discontinued - Jules Borel says to use 0Z2900B01 instead). The hatch gasket listed on Jules Borel is EH1175B01.Unless the gaskets are dried/cracked, just buy yourself a small tub of silicon grease (hardware stores usually stock this in the electrical section) and lubricate the old gaskets to keep it from drying out and leave it be. It's not a dive watch, so the gasket are just there to protect the watch from water when you do the dishes, wash your car, etc, and give a snug fit. Also, the crystal is part number 300W76GN00 (you'll definitely need a case press if you decide to do this).

Last edited by twall3; 05-31-2017 at 03:15 PM.
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