Jump to content

First 6138 Seiko Chronograph


Recommended Posts

Tonight I was finally able to spend some time at my bench and put my 6138A Seiko dual register chronograph back together.  This is from a 6138-0010 (UFO) that I picked up a few months ago.  The movement was originally covered in oil, spots of rust, and looked terrible.  It cleaned up pretty well.  I replaced the mainspring, replaced the upper barrel arbor bushing with a jewel, and replaced a broken hour fly-back lever.  This was my most ambitious attempt yet, and I'm really glad the nights of watching videos, and studying the service manual cover to cover about 5 times paid off.  This movement went back together really well and is now running in for the next 24 hours before making any further adjustments.

 

Before:

image.thumb.png.d8319873df9221ac04734696f6b80c3e.png

After:

image.png.1fb0660054088f553f85f49ebbeb27a1.png

 

 

Edited by thor447
  • Like 5
Link to comment
Share on other sites

Just now, JohnFrum said:

Congratulations. 
I imagine reaming out the bushing was quite challenging? 

On the 6138 the lower arbor is already jeweled. The upper arbor port in the barrel bridge is just a bushing that can be pushed out and directly replaced with a jewel without reaming.   On the 6139, both upper and lower’ arbor ports are bushings. The lower would have to be reamed, but if you have a 6 mm OD stump, that is the perfect size to sit in the recess on the main plate so that it doesn’t move while you are reaming it out. I actually have one of those on the way from VTA for a 6139-6005 Pogue that will be serviced soon. 

  • Like 2
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.



×
×
  • Create New...