How To Fix A Mortise Door Lock

If the latch sticks the knob may be screwed on too tight.

How to fix a mortise door lock.

Starting at the top of the faceplate outline make a series of closely spaced chisel cuts about 1 8 inch deep inside the marks. If the thumbturn for the deadbolt is causing the bolt to jam and lock you out when it s in the wrong position you may. Don t be afraid to use a liberal amount of oil a sticky lock needs the attention. Do the same for the recessed patch on the edge of the door.

Loosen the setscrew securing either one of the doorknobs to the square knob shaft. Place strips of tape around the exterior and interior patched holes to protect the finish on the door. Then on the faceplate loosen the setscrew opposite the lock cylinder and unscrew the lock cylinder. Today we are discussing how to remove an entry mortise lock with a thumb latch on the exterior instead of a regular knob.

This screw should hold the knob securely to the spindle when you turn the knob. Press down on the button on the rear of the wd 40 canister to begin releasing the lubricant into the lock. To remove a mortise lock set cylinder for repair see illustration for how to tighten a loose doorknob remove the deadbolt knob by loosening the setscrew in the sleeve of the knob using a standard screwdriver or allen hex wrench or by removing any mounting screws. Soften the paint.

If you have questions please ask. Try loosening the flathead screw on the base of your doorknob. Most mortise locks are mounted with screws driven through the face plate into the door edge. Meet the mortise lock and door knobs.

Pull the knob off the shaft. The knob and or the spindle may. 3 if this does not help remove the knob. Examine the mortise lock.

Notice the set screw on the base of the knob on the right. Make a series of closely spaced cuts into the mortise area. Cut through the base of the cuts to empty the mortise of excess wood. Lightly sand the patched areas.

Hold down the spray button until the wd 40 begins to overflow from the lock opening. 2 hold the knob on the other side of the door and turn the loose knob clockwise until it fits snugly. This mortise lock set is installed in a 1930 colonial in the boston area. By shutting your door you can mark the point on the door frame that latch is coming in contact with.

1 loosen the setscrew on the knob s shank. You can tighten a simple interior mortise lockset like the one shown at left as follows. From there you can either widen the hole both of the wood and metal or you can unscrew the strike and re secure it in the proper position. Spray the wd 40 into the lock.