As Second Engineer, during attempts to refloat a grounded ship using the main engines, my immediate concerns are:

1. The main engine must not be overloaded or damaged: running the engine at high power while the propeller is partly out of the water or the ship is stuck can cause the engine to over-speed, overheat, or the propeller to be damaged. The engine must be run at a controlled, safe load.
2. The propeller and shafting: if the propeller is partly exposed or striking the seabed, it can be damaged (blade damage, shaft misalignment, bearing damage). The engine must not be run if the propeller is likely to hit the bottom.
3. The engine cooling and lubrication: ensure adequate cooling water and lubricating oil supply; the engine may be run at varying load, so the temperatures and pressures must be monitored.
4. The risk of the engine being stopped suddenly: if the propeller strikes the bottom, the engine could stall or be damaged; the engine must be protected (e.g. by a torque limit and by the ability to stop quickly).
5. The possibility of water ingress: if the hull is damaged, water could enter the engine room; monitor the bilges and the engine room water level.
6. The safety of personnel: the engine room must be manned and the watchkeeping organised; the bridge must be in communication.
7. The fuel supply: ensure adequate fuel (and the correct fuel) is available for the manoeuvring.

1. Change over to a lighter fuel (marine diesel oil) if possible, or ensure the residual fuel is kept at the correct temperature/viscosity so the engine can be manoeuvred and stopped/restarted reliably; residual fuel can solidify if it cools, so keep it heated.
2. Secure the engine safely: stop the engine, engage the turning gear, and ensure it cannot be started accidentally; isolate the starting air.
3. Check the engine and shafting for damage: inspect the propeller, shaft, bearings, and the engine for any damage from the grounding; check the crank web deflections and the alignment.
4. Check the hull for water ingress and the bilges; monitor the engine room.
5. Prepare for the possibility of a long stay: ensure the auxiliary systems (generators, cooling, fuel) are maintained, and the engine is kept warm (jacket water) so it can be restarted.
6. Liaise with the bridge/Chief Engineer and the salvage team; keep records.

1. Check the propeller and shafting for damage (blade damage, shaft alignment, bearing condition); check the stern tube and the propeller shaft.
2. Check the crank web deflections and the main bearing clearances to confirm the crankshaft is not distorted.
3. Check the engine for any water ingress (bilges, crankcase) and for any foreign material.
4. Check the cooling water, lubricating oil, and fuel systems for leaks and correct operation; check the oil level and condition.
5. Check the starting air system and the interlocks; ensure the turning gear is disengaged.
6. Turn the engine on turning gear to check it rotates freely and there is no obstruction.
7. Check the exhaust system and the turbocharger for damage.
8. Start the engine at low speed/load and monitor all temperatures, pressures and for abnormal noise before increasing the load.