1. Locate the front door of the motor and open it.
2. Turn the thumbwheel counterclockwise until it is completely removed from its socket.
3. Look closely at the point where the thumbwheel thread is located. Check if it appears wet or dry.
4. If it's wet, this indicates an oil leak. In this case, you should remove the motor and have it serviced and repaired at your closest CENTURION branch. If it's dry, there is no oil leak.
Additionally, inspect the bottom of the chamber cover, which is the cover where the chamber wheel turns into the Thumbwheel. Ensure there is no oil or wet substance present on the bottom of this cover.