Service: Caravelle With a Bulova 11DP Movement
This is a regular service of a Caravelle dress watch.
Caravelle had links with Bulova (Bulova’s less expensive line). The movement is the Bulova 11DP which is a rebranded Citizen 0241 movement.
This movement was available in two versions. One has 7 jewels and the other one has 17 jewels.
When you remove the case back, it’s a bit disappointing to see that it’s the version with 7 jewels but it works. Actually, it works great because, after the service, the amplitude is 270 (which is very good for a citizen), with a beat error of 0.3 m/s and a rate of +4 sec.
Before you start working on a mechanical movement, make sure to remove all the power from the mainspring. This is to prevent any damage while working on the wheel train.
Move the click away from the ratchet wheel while letting the crown slip between your thumb and index finger.
Lift the balance and the pallets.
Turn the movement around and lift the cannon pinion. You can’t remove the center wheel later if the cannon pinion is still installed.
Lift the wheel-train bridge to gain access to the wheel train.
Remove the ratchet wheel and the crown wheel.
Often, the crown wheel screw has a left-hand thread and the screw for the ratchet wheel is a regular one. In this case, they both have a left-hand thread.
Left-handed screws are usually marked with 3 grooves instead of just 1, just like these are. This is a visual warning: don’t try to unscrew it the usual way because you’ll break it.
You’ll need to unscrew the ratchet wheel screw clockwise but the ratchet wheel turns in the same direction. Use a peg wood to stop the ratchet wheel from turning when you’re unscrewing the ratchet wheel screw.
Lift the barrel bridge and remove the sweep-second wheel, 3rd wheel, and the escape wheel.
Lift the barrel, the center wheel cock and finally the center wheel.
Flip the movement around and start with the bottom plate.
Remove the motion works and the keyless works.
Pre-clean the pivot holes and bearing jewels with a peg wood.
Clean all the parts in the watch cleaning machine.
Fit the center wheel and the center wheel cock.
Install the barrel.
Place the escape wheel, 3rd wheel, and sweep second wheel in position.
Reinstall the wheel-train bridge.
Install the barrel bridge, the crown wheel, and the ratchet wheel.
Remember that both screws have a left-handed thread.
Turn the movement around and start with the motion works and the keyless works.
Notice that usually, the set lever spring covers the setting wheel and the minute wheel as well.
This particular movement uses a separate cover for the minute wheel and the setting wheel.
Flip the movement to the top plate and reinstall the pallets and the balance.
Remove the shock protection system to clean and lubricate.
The Bulova 11DP uses Citizen’s Parashock system. This system has a removable springy middle part with the bearing jewel and a top piece with a cap jewel.
You’ll need to rotate the top piece until one of the legs aligns with the notch so you can lift it. Replacing it is the same trick in the reverse order.
Use a peg wood to gently hold the top piece down while you’re rotating it.
Do you have a similar Caravelle or a watch with the 11DP movement? Let me know in the comments below.