Dandong 4130 disassembly and service

[Ylijumala]

So this post-raid Noob DiW Carbon Daytona I've had for a few months decided to start stopping all of a sudden after working with no issues and with almost perfect timing and amplitude. Since the stoppage happens at the same time (in 60 second cycles), there probably is some debris in the gears somewhere. I am a beginner with this hobby and the experienced watch smiths told me earlier to forget about trying to service a 4130 by myself. Naturally this is a challenge accepted

(Disclaimer: I have purchased quite a few watchmaking tools from a local watch smith and I also have the 4130 service manual, in addition to the proper oils. I also have practiced on a few simpler movements first. Don't attempt this without the proper tools. Patience is a must.)

Notes during the disassembly:

• service manual states that the movement can be disassembled up to the barrel while cased, so I did that
• way too much silicone grease in the back cover gasket, it has started creeping further into the watch
• oiling is incorrectly done and the oil used looks like normal mineral oil (colour, smell)
• too much oil and also in the wrong places
• no grease used
• no oil in several required jewels
• surprisingly, the escape wheel and pallet stones are oiled and the amount looks ok
• dirt and some metal shavings in the movement
• parts finishing looks ok
• obviously no epilame anywhere
• keyless works up to the barrel winding gear excessively oiled (not greased)
• chrono seconds wheel friction spring is very delicate, have to be careful with it
• don't wash the chrono counters jumper in a machine, it is very delicate as well

I now have disassembled the movement and washed the parts in an ultrasonic cleaner. Rolex manual specifies that the movement should first be washed as a whole, but I did not do that and instead washed the parts separately just to be safe. Epilame has been applied to the specifications in the manual and I'm now starting to assemble the movement back together. Photo dump of the disassembly follows in the next post.

 

[Ylijumala]

 

[Plaasbaas]

Awesome. Can't wait to see how this goes on. Hope you get her up and running again, fingers crossed!

 

[Ylijumala]

Assembled the movement to the point that it could be started up (for timing adjustment according to the service manual) and it needed no encouragement when I slipped the balance back in its place. Now to let it run for a moment with the escapement wheel and pallet stones "dry" to wear off the epilame from the contact points, then it's time for some Moebius 9415. Gonna post more pics later.

 

[Nono92]

Hello,
Does it work now ?

 

[LoveDonkey]

It looks like I am about to attempt the same job. I have a few gen movement parts to install and need a service, but finding someone to do the work has proven difficult.

 

[dogwood]

Am currently doing the same thing. Have found the escape wheel shock setting on the train bridge to be a HUGE pain in the ass to reassemble. I managed to break the KIF spring and had to order some replacements.