One of the few things graphite is good for is lubing the inside of a mortise lock body if it has a cylinder for a key lube with wd40 or similar light spray oil only no 3 in 1 no grease no silicone spray.
Remiving a mortise entrance lock from the door.
Insert the pin straight through the lock cylinder to reach the lock s release mechanism.
Once you have removed the keyway from both sides there should be nothing but a couple of screws on the striker jam plate holding the bolt assembly.
You need to remove the key set section as pictured on the left.
Insert a straightened paper clip into this hole and apply pressure to release the interior handle.
There may be a small pinhole holding the handle in place.
A good way to clean out the lock body is with brake cleaner spray followed by wiping with a paper towel.
Corrects the symptom where the key will spin without locking or unlocking the lock.
Mortise locks may have wavered in popularity over the years but they remain a common way to secure a home.
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A mortise locks has a pocket called a mortise that is cut into the door itself.
Examine the handle and trim on the interior side of the door.
It may be very corroded and require a bit of persuasion to split the halves and remove from the deadbolt assembly.
Remove the face plates prying them up with the screwdriver if needed.
Removing a mortise lock requires no more tools than for removing a regular knob door lock.
The lock is encased in this pocket making it a more secure locking method.
Use a screwdriver to remove all screws rather than a drill.
However many homeowners prefer the newer cylindrical type of lock set which doesn t require such a large pocket in a door.
Removing a mortise lock.
Remove the screws attaching the inside face plate to the edge of the door as well as the plates on the door faces.
Key will spin without operating the deadbolt.