The engine is running fine but why is there no propulsion?
If you see this in your bilge you better start investigating...take the Vetus flexible coupling appart and look at the state of the rubbers Mmmm that looks bad....so that is the reason why I found constantly rubber bits in the bilge! So this is going to be an extensive repair. Remove the shaft brake. To remove the brake disk and Vetus flexible coupling you have to lift the engine and pull it back which requires the removal of everything that is potentially causing interference such as the exhaust, syphon and tie-wraps holding the wiring to the engine frame then hoist it using a mizzen mast halyard on the main winch as it weighs 250 kg.