The most common reasons a door lock keeps turning are a broken, incorrect, or stuck cam/tailpiece lever inside the lock mechanism. Here's how you can troubleshoot and fix the issue:
Troubleshooting the Turning Door Lock
Before attempting any repairs, it's important to identify the root cause. Here are some potential culprits:
- Broken Cam or Tailpiece: The cam (also called a tailpiece lever) is a small component inside the lock that connects the cylinder to the locking mechanism. If it's broken, the cylinder will turn freely without engaging the lock.
- Incorrect Cam Installation: If the cam was recently replaced or reinstalled, it might be the wrong type or installed incorrectly, preventing it from properly engaging the lock.
- Stuck Cam: Sometimes, the cam can become stuck in a position where it doesn't fully engage the locking mechanism.
- Loose Lock Cylinder: If the lock cylinder itself is loose, it might turn without operating the bolt.
Fixing the Issue
The solution depends on the cause:
- Inspect the Cam/Tailpiece: This usually requires removing the door handle and lock cylinder. Examine the cam for any signs of damage, such as cracks or breaks.
- Correct or Replace the Cam/Tailpiece:
- If the cam is simply misaligned or loose, try repositioning and tightening it.
- If the cam is broken, you'll need to replace it. You can usually find replacement cams at hardware stores. Make sure to get one that's compatible with your lock.
- Check the Lock Cylinder: Ensure the lock cylinder is securely fastened to the door. Tighten any loose screws.
- Lubricate the Lock Mechanism: Sometimes, a sticky lock mechanism can prevent the cam from moving freely. Try lubricating the lock cylinder and surrounding components with a lock lubricant.
When to Call a Professional
If you're not comfortable disassembling your door lock or if you've tried the above steps and the lock still isn't working, it's best to call a locksmith. They have the expertise and tools to diagnose and repair more complex lock issues.
In summary, a door lock that keeps turning usually points to a problem with the internal cam mechanism. By inspecting, adjusting, or replacing the cam, you can often resolve the issue.
