How to Fix a Clock That Loses Time

The clock in my son's bedroom constantly lost time. Even with a fresh battery, it would run almost 10 minutes slow just a week after the battery was replaced. And while initially I thought this might be an ingenious trap by an 8-year old to get a few extra minutes of playing before bedtime, he seemed as surprised as me by the clock always being just a bit off.

This Instructable explains how we fixed our clock. It outlines two simple ways to clean and maintain your clock to ensure it keeps an accurate time without lagging.

• A slow clock
• Nail file or fine sandpaper or small file (for abrasive material removal)
• Rag or paper towel or Q-tip (for cleaning)

• Small adjustable wrench (optional)

The most common cause of an analog clock losing time is that there is buildup in the battery compartment that is keeping the battery from connecting fully with the clock mechanism.

Remove the battery and check the leads to see if there is any buildup from a leaky battery, dust, etc.

Using a file (or other abrasive surface), gently rub the buildup away. If there is any remaining buildup that cannot be removed with the file, gently wipe it away with a damp rag. Make sure to let the leads fully dry before putting the battery back into the clock.

A clock that has been sitting in a dusty space - like a clock on the wall of a busy makerspace - can also lose time if there is any buildup in the hand mechanism.

To maintain your clock mechanism to avoid this problem, gently remove the hands as shown in the pictures above. Begin by removing the pin or threaded cap that holds the hands onto the axle. Next, carefully pull each hand off. If you plan to take the entire mechanism out, you will need to unscrew the small nut that holds the mechanism tightly to the clock face as well.

Once you have removed these parts, take a damp rag and wipe both the rotation axle components and the hands themselves. Once clean, reassemble (by working through the images in reverse order).

These two steps have successfully fixed two clocks in our home now and hopefully will keep your clocks running a little longer as well.

If neither of the two previous fixes works for your clock, you may need to replace the entire mechanism. These are relatively inexpensive and are easy to find at a hobby store or on Amazon.

If you have any other tips or tricks, please feel free to leave them in the comments. :)