Watch: Main Engine Crankshaft Deflection Test on a Ship
Crankshaft deflection is an important task that most be carried out as recommended by the engine maker at specified intervals to ascertain and ensure the health of the crankshaft and as well the general efficient running of the engine.
The video below shows the process of carrying out crankshaft deflection test of a ship's main engine.
https://youtu.be/nP9XGFbXpv0