WS 19: Servicing a SEIKO Chronograph 6138

This is not a 6138 service manual but a photo series about servicing a 6138 Chronograph movement. Do not think by looking at these pictures, you could simply go ahead and dismantle your 6139 or 6138. While some parts of the procedure are explained, others are not. Thus simply enjoy this as a complete strip-down of a 6138 and learn about its components. Servicing and adjusting a 6139/8 requires skills, one needs to know its parts and their functions, otherwise it would become an endless and frustrating puzzle.

Rob had always wanted one of these bigger case (ca. 41 mm diameter) SEIKO chronographs and suggested to shoot a photo series about the complete servicing and adjusting of such a movement. This one is going to be in his private collection. All the watch work had been done by Rob, I simply kept interrupting him when I "needed" a picture. Despite those frequent breaks, all went well and speedily. Rob knows this movement very well, he had serviced more then 10 of those recently and thus to him this was a walk in the park.

Please respect our copyright. Do not use any of the pictures in this report for any of your Sales activities. This is not only to protect our copyright, but also to protect future buyers. There are so many Franken 6138 movements out there, if you see one advertised using our pictures, simply run!
Of course you are invited to use these pictures for your personal information and for discussion watch forums. If you use the pictures, the copyright mark may not be removed and the picture not be altered in any way. But once more: NOT for sales forums and NOT for Ebay auctions. We will report abuse immediately.

The Start	The Case Back removed	The Disassembly starts	First Surprise	Dial Side
The Rotor is removed	Automatic Winding removed	The Day and Date Disks	Dial Side: Day Date disks removed, chrono hour wheels removed	The big parts Basket filling up
Rob at work	The small Parts Basket	The ultrasonic "Bath"	After the Bath, rinsing in Methyl Alcohol	Laying the Parts out
First Batch of cleaned Parts	Adding the big Parts from the first Batch	View of the Chrono mechanism and Balance	The wrong and correct Wheel	Chrono plate and Balance removed
The big Balance Wheel	Now the Movement is completely disassembled	The vertical Clutch	The vertical Clutch opened!	The Top and the Chronowheel axle
Column Wheel Comparison with Valjoux 72 (3 pictures)	All Parts	<<< End of the Disassembly Start of the Assembly >>>	Springs	The Dial Side
The Chronograph parts are reassembled	Date Disk	On the Timing Machine Vibrograf 200	A look at the Movement from the Side	Close-up from Side
Replacing Hands	HOROTEC Hands Press	The Magic Lever	The Case and Movement and the Automatic Winding system	The Case Back
		The Happy End