Seiko 6139 Service Manual

You cannot use generic Moebius oil on the 6139. The manual specifies for the barrel and Seiko T-1 (or modern equivalents like Moebius 9010/9104) for the high-beat (21,600 bph) escapement. More importantly, it tells you where to put the grease on the column wheel. Over-oiling the vertical clutch will cause it to slip, and the chronograph will stop running.

Screwdrivers (1.0mm - 1.8mm), Tweezers (Anti-magnetic), Hand levers, Case wrench, Rodico, Loupe. seiko 6139 service manual

Clean each component using a soft brush and a cleaning solution. Dry thoroughly with a soft cloth. You cannot use generic Moebius oil on the 6139

Perform quality control checks to ensure the movement meets Seiko's standards. Over-oiling the vertical clutch will cause it to

The Seiko 6139 is a historic caliber, but it is unforgiving. Download the manual. Read the assembly sequence three times. Buy the correct oils. And when you get to the brake spring? Take a deep breath.

To disassemble the Seiko 6139 movement, follow these steps:

Test the Seiko 6139 movement for accuracy and timekeeping. Check for: