Useful information before getting started:
First, let’s examine the components of our cylinder:
There are 4 different cylinder types:
To gauge the cylinder size you can use a simple ruler or you can print out the CISA template you can find here.
Measure dimensions A and B as shown in the diagram below, taking into account the thickness of the door and the thickness of the plates/roses for cylinders with an adjustable shaft or thumb turn; take care that dimension B corresponds to the shaft or thumb turn side.
In particular applications where security is important, the cylinder should not protrude more than 3 mm from the door profile to prevent picking with tools and offer increased resistance to snapping.
A step-by-step guide to replacing the cylinder:
Remove the cylinder fixing screw (1). Turn the key approximately 30° clockwise or anti-clockwise to align the “cam” with the profile of the cylinder; this operation should not be carried out if the cylinder installed is a basic model without a protruding cam as standard (2).
Keeping the key turned, pull out the cylinder (3).
To facilitate cylinder removal, it may be necessary to remove the handle plate or rose if present.
To insert the new cylinder through the door, turn the key approximately 30° clockwise or anti-clockwise to align the “cam” with the profile of the cylinder (4); this should not be carried out when installing the CISA Locking Line range as these cylinders do not have a protruding cam. Insert the cylinder through the door (5), position it correctly and secure it with the screw supplied as standard (6).
Make sure the fixing screw is tightened correctly onto the cylinder and is the right length; when replacing it, check the length of the old screw.
Do not over-tighten the fixing screw as this may cause the lock to malfunction or jam.
To check that the cylinder has been installed correctly and the lock is properly working, proceed as follows:
With the door open, turn the key clockwise and anticlockwise, making at least one complete 360° turn. The key should turn smoothly without resistance or friction, operating both the latchbolt and deadbolt of the lock.
Proper and regular maintenance is the best way to ensure the long-term reliability and performance of CISA cylinders. Regular maintenance helps prevent wear and tear, jams and security issues, ensuring smooth operation and consistently high levels of security for the door.
