Changing a door lock mechanism involves a series of steps that vary slightly depending on the type of lock (cylinder, mortice, etc.). Here's a general guide:
Steps to Change a Cylinder Lock Mechanism:
This is common for exterior doors.
- Measure and Choose the Right Replacement Cylinder: Accurately measure the length of your existing cylinder to ensure the replacement fits correctly. Incorrect measurements will prevent proper installation and function. Buy a replacement cylinder that matches your existing lock's profile (e.g., Euro cylinder, oval cylinder).
- Remove the Door Handle: Typically, this involves loosening screws on the inside handle and pulling both handles off. You might need a screwdriver (usually a Phillips head) or an Allen key.
- Remove the Existing Cylinder: Locate the retaining screw on the door edge, level with the cylinder. Unscrew it and carefully wiggle the cylinder out. You might need to insert the key slightly and turn it to help release the cylinder.
- Install the New Cylinder: Insert the new cylinder into the opening. Ensure it's flush with the door surface. You may need to slightly jiggle or turn the key for it to slide in.
- Reassemble and Check: Secure the cylinder with the retaining screw. Replace the door handles and tighten the screws. Test the lock with the new key to ensure it functions smoothly from both sides. If it's stiff, check the alignment.
Steps to Change a Mortice Lock:
Mortice locks are commonly found on wooden doors.
- Choose the Right Mortice Lock: Determine the backset (distance from the door edge to the center of the keyhole) and the case depth (the overall depth of the lock body). Also, consider the type of mortice lock you need (e.g., deadlock, sash lock).
- Measure the Existing Lock: Measure the dimensions of the lock case, the distance to the spindle hole (for handles), and the distance to the keyhole. Note the position of the bolt and latch. Accurate measurements are essential for a proper fit.
- Remove the Old Lock:
- Remove the door handles.
- Unscrew and remove the faceplate (the metal plate on the edge of the door).
- Carefully extract the lock body from the mortice (the recessed area in the door). You might need to use a screwdriver or a small pry bar. Be careful not to damage the door.
- Install the New Lock:
- Insert the new lock body into the mortice.
- Secure the faceplate with screws.
- Reattach the door handles.
- Test the Lock: Test the lock mechanism thoroughly to ensure it locks and unlocks smoothly. Make sure the latch engages correctly. Adjust if necessary.
Important Considerations:
- Safety First: Consider the security implications. Upgrade to a higher-security lock cylinder or mortice lock if necessary.
- Door Type: The type of door (wood, metal, uPVC) will influence the tools and techniques required.
- Tools: You'll likely need screwdrivers, Allen keys, measuring tape, and possibly a drill.
- Professional Help: If you're uncomfortable with any of these steps, consult a locksmith. They can ensure the lock is installed correctly and provide security advice.
- uPVC doors: Changing a lock on a uPVC door is similar to changing a cylinder lock, but requires extra care to avoid damaging the door frame.
