Introduction
Morbier (Comtoise) clocks are robust French weight-driven movements known for their long pendulums and crown-wheel verge escapements. When a Morbier clock runs for only a few hours before stopping, the cause is almost always related to power loss, pendulum interference, or escapement geometry. This guide explains how to diagnose and correct the most common issues affecting these antique movements.
How a Morbier Movement Works
Verge and crown-wheel escapement
This early escapement design is sensitive to alignment, pallet depth, and pendulum freedom.
Long pendulum design
The pendulum must swing freely without touching the case, weights, or crutch.
Weight-driven power
Heavy weights supply strong power, but any friction in the train quickly stops the clock.
Antique construction
These movements often show wear in pivot holes, arbors, and verge components.
Suspension and crutch system
Even slight misalignment causes beat issues and early stoppage.
Common Reasons a Morbier Clock Stops After a Few Hours
Pendulum interference
The long pendulum may rub the case, weights, or decorative elements.
Beat out of adjustment
An uneven beat causes the clock to lose power and stop.
Worn pivot holes
Oval pivot holes create friction and reduce power transmission.
Dirty or dry pivots
Dried oil or dirt increases resistance in the train.
Escapement misalignment
Incorrect pallet depth or crown-wheel geometry causes fluttering or stalling.
Diagnosing the Issue
Check pendulum clearance
Ensure the pendulum swings freely and does not touch the case or weights.
Listen to the beat
The tick and tock should be evenly spaced. If not, adjust the crutch.
Inspect pivot wear
Look for dark pivot rings or excessive side shake.
Examine the escapement
Check pallet depth, crown-wheel tooth condition, and verge alignment.
Test the train by hand
Advance the wheels gently to feel for binding or resistance.
Correcting the Problem
Adjust the beat
Gently bend the crutch until the beat is even.
Rebush worn pivot holes
Properly centered bushings restore power and depthing.
Clean and polish pivots
Remove dirt and old oil, then polish pivots for smooth operation.
Correct escapement geometry
Set pallet depth so the crown wheel locks cleanly without flutter.
Verify weight and cord condition
Ensure weights are correct and cords are not binding.
Troubleshooting Flowcharts
If the clock stops after a few hours
Check beat → Check pendulum clearance → Check pivot wear → Check escapement → Check weights
If the pendulum swing is weak
Check power → Check pivots → Check escapement → Check crutch alignment
If the escapement flutters
Reduce pallet depth → Check crown-wheel teeth → Check verge alignment
If the movement binds
Check bushings → Check pivots → Check wheel depthing
If the clock runs only when tilted
Beat off → Crutch misaligned → Pivot wear
Common Mistakes to Avoid
Over-oiling the escapement
Oil on the crown wheel causes slipping and erratic running.
Ignoring pendulum interference
Even slight rubbing stops the clock quickly.
Incorrect pallet depth
Too deep causes stalling; too shallow causes flutter.
Using the wrong weights
Incorrect weight mass affects power delivery.
Skipping pivot polishing
Dirty pivots dramatically reduce power.
Checklist for Final Verification
• Beat even
• Pendulum swings freely
• Escapement locks cleanly
• Pivots polished
• Bushings centered
• Correct weights installed
• Movement runs full duration
FAQs
Why does my Morbier clock stop after a few hours?
Usually due to beat issues, pendulum interference, or escapement misalignment.
Do Morbier clocks need heavy weights?
Yes—correct weight mass is essential for proper power delivery.
Why is the escapement so sensitive?
The verge-and-crown-wheel design requires precise geometry.
Can worn pivots stop the clock?
Yes—pivot wear is a major cause of power loss.
Are Morbier clocks repairable?
Yes—most issues are fully repairable with proper antique French clock parts.
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