Servicing Rolex 4130 Daytona Problem !

[Watchaddict13]

I serviced this Daytona with the 4130 movement. During reassembly, everything went smoothly until it came time to install the chronograph wheel bridge. The chronograph wheel and the clutch module engage perfectly without the bridge, but once the bridge is installed, they no longer engage and this causes the watch to stop.


Has any specialist encountered this issue and managed to resolve it? I’ve spent 5 hours trying to figure out the cause, but I haven’t succeeded. I’ve watched all the 4130 servicing videos, including those from Asia, etc. Thank you very much for your help—I’m truly grateful

 

[KJ2020]

I serviced this Daytona with the 4130 movement. During reassembly, everything went smoothly until it came time to install the chronograph wheel bridge. The chronograph wheel and the clutch module engage perfectly without the bridge, but once the bridge is installed, they no longer engage and this causes the watch to stop.


Has any specialist encountered this issue and managed to resolve it? I’ve spent 5 hours trying to figure out the cause, but I haven’t succeeded. I’ve watched all the 4130 servicing videos, including those from Asia, etc. Thank you very much for your help—I’m truly grateful

First closely examine all of the jewels in the chrono bridge and the top pivots of all the gears that fit into them. A cracked, chipped or slightly askew jewel can cause your issue.

I assume you know that the jumper for counters (red arrows) needs to mesh with the setting wheel for minute counter (blue arrow). These two parts can easily dislodge like they are now when attempting to seat the chrono bridge.

The other thing to check is the skinny arm of the jumper - it often will creep up and get stuck under the right side of the bridge while you get all the pinions seated in their jewels. You can lift the bridge slightly on the right and pry it out from underneath but be extremely careful as it is quite fragile. You can of course remove the bridge and start over for a safer approach, but I've done the lift and pry technique several times successfully.

 

[Watchaddict13]

Thanks you very much !