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SEIKO 6138/6139 Repair Procedure of CENTER CHRONOGRAPH WHEEL PREAMBLE: My Quest for a Repair Procedure of Seiko 6139B CENTER CHRONOGRAPH WHEEL (PN. 888612) I have on several occasions searched for information on how to repair the infamous Seiko (6138, 6139) CENTER CHRONOGRAPH WHEEL, to no avail. Threads about the subject matter are generally sprinkled with authoritative sounding comments that they cannot be repaired. My question is why? Why can the number of parts stacked on the extended pivot shaft, stacked above the fourth wheel not be lifted off of the shaft, giving access to the fourth wheel staking location? In my case I have 2 chronos where the staking on top of the fourth wheel, holding it in place, has loosened making the wheel loose)? Logic leads me to believe, if I remove the 2-3 clutch parts (above the fourth wheel) off the top of the shaft, exposing the top of the fourth wheel, I could re-stake it and then re-install the parts in sequence, thus repairing my problem. MY QUESTION: Has anyone had success removing the stack of clutch parts above the fourth wheel and/or know of and literature explaining the procedure? NOTE (6138B): interesting that the Center Chronograph Wheel PN.888611 is listed, as one part, (a complete) and in the diagram it is shown as one-part, but in the part list there are a number of additional parts listed. I’m assuming this is the stack of parts sitting above the fourth wheel that make up the (complete). So with all of this said, how do we lift these parts off the shaft without damaging them and the chrono ASSY so that the fourth wheel can be re-staked? Thanks in advance, Will
Hi, I uncovered in my selection of old stock I got from an auction an automatic Seiko chronograph 6139. I read a little about some problems these watches had, namely the clutch on the centre chronograph wheel and the seconds hand mounting. I am not sure if my diagnosis is close: while the chronograph is running the watch keeps time pretty well (within a couple of seconds per day worn on hand). Not always, but more often then not, when the chronograph is stopped the watch slowly stops (say it takes 3-4 seconds). When the chronograph is released the watch starts running. The fly back button does the job properly, start/stop/restart button works well. The watch had issues with the hammer click (was too strong - not original hammer spring) but for the time being it is ok. I did not disassemble the watch yet as I am waiting for the original hammer spring. So this is a little hypothetical/frivolous question: Is there a chance that the (weak spot) centre chronograph wheel needs just cleaning and oil rather then complete replacement? Parts for this movement are scarce and the centre chronograph wheel is unreasonably pricey and the wheel itself - as far as I found out is not serviceable. Any comment will be appreciated. Regards ps. Picture for movement ID.