Seiko 0843-8040 fixable?

timepirate · November 30, 2019

Just picked up this Seiko 0843-8040 (quartz), from 1975. It's in nice shape, but unfortunately isn't running, but the second hand does twitch every 4-5 seconds. Is there any hope for fixing this watch? Does the fact that it's twitching mean that the coil is ok? Just curious if this might be an easy fix, or more complicated. Hoping to repair it, and not have to search for another movement. Any advice would be appreciated.

yankeedog · November 30, 2019

Probably gunked up with fossilized oil.You could try the spray and pray method.Remove the battery.Take the movement out ,remove the hands and dial, and hose it down gently with plastic safe electric contact cleaner let it flow through the gears. lubricate sparingly with synthetic oil, after letting it dry thoroughly. This has worked for me in most cases.

Edited November 30, 2019 by yankeedog

watchweasol · November 30, 2019

Hi As described by Yankeedog it is symptomatic of low battery power or a gummy /dirty movement, Check the battery voltage , if below 1.3v change anyway. More than likley the latter. So dismantle the watch and remove the circuit assembly and coil then proceed to flush the mechanics with carbutetter.

cleaner ( no residue) and leave on a tissue to dry, use a hand blower to accelerate the process. When completely dry lubricate the pivots and reassemble. If possible run in on a line release unit to get the oil into the pivots, re fit battery and test. Use synthetic Quartz oil. I have attached the 0843 tech sheets for your interest.

4599_seiko 0843A.pdf