How to replace a Euro Cylinder in a Mortise Lock

Introduction

Euro cylinders are an essential component of most modern doors, providing the primary locking mechanism for homes, offices, and other buildings. However, like all mechanical components, they can wear out over time or be damaged due to attempted break-ins. If you find yourself in a situation where you need to replace your euro cylinder, don't worry; it's a simple and straightforward process that you can easily do yourself with the right tools and knowledge.

In this guide, we'll walk you through the steps of replacing a euro cylinder, from selecting the right replacement to installing the new cylinder.

By following these steps, you'll be able to secure your door and protect your property in no time.

What you need

Step 1 Measure the cylinder

How to replace a Euro Cylinder in a Mortise Lock, Measure the cylinder: step 1, image 1 of 1

Open the door.
Measure the distance from the the forend screw holding the cylinder to the faceplate as shown in the picture.
Buy the new cylinder.
The maximum overhead you can dimension the new cylinder too large is 2mm. If The cylinder sticks out too much it becomes vulnerable to cracking.

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Step 2 Remove the screw

How to replace a Euro Cylinder in a Mortise Lock, Remove the screw: step 2, image 1 of 1

Use a PZ2 screwdriver to remove the fixing screw from the side of the lock.
Some older locks might use a slotted screw instead.

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Step 3 Remove the cylinder

How to replace a Euro Cylinder in a Mortise Lock, Remove the cylinder: step 3, image 1 of 3

How to replace a Euro Cylinder in a Mortise Lock, Remove the cylinder: step 3, image 2 of 3

How to replace a Euro Cylinder in a Mortise Lock, Remove the cylinder: step 3, image 3 of 3

Insert the key and turn it to about 20° to the right (or left) to release the cylinder from the lock insert.
If you don’t have the old key or the cylinder doesn’t work anymore you can give this guide a try.
Pull out the old cylinder.