How to Clean a Clock's Mainspring

A clock’s mainspring is the wound metal strap that provides the power to older mechanical clocks. When an antique clock is wound it stores energy in the mainspring, releasing it overtime. If cleaned improperly or neglected, the metal spring will form rust spots that can render it useless. Use the correct tools and chemicals to clean and lubricate your clock’s mainspring to prevent a costly repair.

Screwdriver or Allen wrench
Lint-free cloth
Kerosene
Steel wool
Cotton swab
Automotive or clock lubricant

Instructions

- 1
  Wait until the clock is completely wound down and has stopped. Don’t attempt to clean the mainspring while it holds any tension to prevent causing injury.
- 2
  Remove the back panel from the clock with a screwdriver or Allen wrench. Prop the panel against the clock to prevent it from becoming warped or damaged.
- 3
  Locate the mainspring, which is a metal coil found within the clock’s inner workings. If there are any panels or pieces blocking access to the mainspring, remove the screws that hold them in place before continuing.
- 4
  Wipe down the length of the mainspring with a lint-free cloth to remove loose dust or dirt.
- 5
  Dampen a lint-free cloth with kerosene and wipe down as much of the mainspring as you can access to remove difficult dust and remaining lubricant. Allow the kerosene to evaporate before continuing.
- 6
  Examine the mainspring for any rust and pitting. If any is found, rub the metal gently with a piece of #0000 steel wool. Wipe away the loosened rust with a separate lint-free cloth.
- 7
  Dampen a cotton swab with automobile or mainspring lubricant. Rub the accessible areas of the mainspring with the lubricant.
- 8
  Wind the mainspring and watch for any excess lubricant dripping from the metal. Wipe away this excess with a lint-free cloth.
- 9
  Replace the clock’s back panel.

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