Why Deep Cleaning Clock Plates and Wheels Matters
Clock plates, wheels, and lantern pinions accumulate old oil, dust, and abrasive residue that gradually increases friction throughout the train. Even a small amount of contamination can slow the movement, cause erratic timekeeping, or lead to premature wear of pivots and bushings. Deep cleaning restores the brass surfaces, removes hardened deposits, and ensures that every wheel runs freely once the movement is reassembled. If you have not yet removed the mainsprings, see our guide on cleaning and greasing a clock mainspring.
How to Prepare Clock Plates for Cleaning
Removing Surface Contamination
Before immersion cleaning, loose debris should be brushed away from the plates. Old oil often forms dark rings around pivot holes, and this residue must be softened before it can be removed completely. A soft brush dipped lightly in cleaning solution helps break down the surface layer without scratching the brass.
Inspecting for Damage Before Cleaning
Once the plates are free of loose debris, they should be inspected for cracks, bent areas, or previous repairs. Cleaning will not correct structural issues, so any damage must be noted before the plates enter the solution. Pay particular attention to the great wheel bushings, as these areas often show early signs of wear.
Cleaning Clock Plates in Solution
Using an Ammonia-Free Cleaner
Clock plates should be cleaned in an ammonia-free solution to prevent stress cracking in the brass. The plates are fully submerged and agitated gently to loosen dirt and old oil. The cleaning time varies depending on the level of contamination, but the plates should remain in the solution only as long as necessary to achieve a uniform, bright finish.
Rinsing and Drying the Plates
After cleaning, the plates must be rinsed thoroughly in clean water to remove all traces of solution. Any residue left behind can cause corrosion or discoloration. The plates are then dried completely using compressed air or a soft cloth. Moisture trapped in pivot holes can cause rust on the pivots during reassembly, so careful drying is essential.
Cleaning Clock Wheels and Lantern Pinions
Removing Old Oil From Wheel Teeth
Wheel teeth often hold hardened oil that cannot be removed by soaking alone. A soft brass brush is used to clean each tooth individually, ensuring that no residue remains. This step is especially important for the escape wheel, where even slight contamination can affect the action of the pallets.
Cleaning Lantern Pinions
Lantern pinions trap dirt between their trundles, and this debris must be removed to prevent friction in the train. Pegwood is used to clean between each trundle, rotating the pinion as needed to reach all surfaces. For a complete guide to this process, see our article on pegging lantern pinions and bushings.
Final Inspection After Cleaning
Checking for Residual Contamination
Once the plates and wheels are dry, they should be inspected under strong light. Any remaining dark patches, oil rings, or debris indicate that additional cleaning is required. The pivot holes should appear bright and free of residue, and the wheel teeth should show clean, sharp edges.
Preparing for Reassembly
After cleaning, the wheels are placed in order and inspected for straightness and proper pivot condition. Clean components make it easier to identify worn bushings, bent arbors, or damaged pivots. If you are ready to continue the restoration process, see our guide on inspecting pivots and determining when bushings must be replaced.
FAQs
Can I use household cleaners on clock plates?
No. Many household cleaners contain ammonia or harsh chemicals that can damage brass or cause stress cracking.
Do I need an ultrasonic cleaner?
An ultrasonic cleaner is helpful but not required. Manual cleaning with proper solution is sufficient for most movements.
Why do my plates look dull after cleaning?
Dullness usually indicates incomplete rinsing or residue left from the cleaning solution. A second rinse typically resolves the issue.
Should wheels be polished?
No. Wheels should be cleaned, not polished. Polishing removes material and can alter tooth geometry.
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How to Clean and Grease a Clock Mainspring
How to Peg Out Lantern Pinions and Bushings
How to Inspect Clock Pivots and Bushings
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