1. Stop the generator from Engine control room.
2. If remote starting and stopping from the engine control room or any other position is not available, manually pull the fuel rack to the ‘zero’ position. This action reduces the fuel supply to the engine, causing it to stop.
3. If it is unsafe to approach the engine, stop the engine by shutting off the quick closing valve for the generator. This will cut off the fuel supply to the engine, leading it to stop. Note that this may cause a temporary blackout in the engine room if another generator is not running.

1. The governor may fail due to various reasons such as breakage of the governor drive, internal links, hydraulic pump shaft, pins, levers, and other moving parts.
2. The overspeed trip may fail to act due to rust, being frozen, or becoming non-functional over a long period of non-activation.
3. Although highly unlikely, both the governor and the overspeed trip might fail simultaneously if they share a common drive mechanism that has broken down.
4. The overspeed trip mechanism is seldom activated and may not be regularly maintained or tested, leading to potential failures during an actual overspeed situation.

(i) Mechanical Checks

1. Check for signs of damage or stress in the running gear components such as crankshaft, connecting rods, connecting rod bolts and bearings.
2. Open and inspect two randomly selected cylinders for cracks, deformation, or abnormalities, focusing on piston ring grooves, gudgeon pin, bushes, and bottom end bearings.
3. Open and inspect two main bearings, including the lower half, and check for defects.
4. Inspect crankpins and journals carefully for any cracks, especially in the fillet areas.
5. Conduct a thorough inspection of the crankcase, gear case, camshaft, cams, rollers, and other accessible areas. Take crankshaft deflections.
6. Check the condition of the crankcase lubricating oil for overheating and oxidation; change the oil if in doubt.
7. After completing inspections and repairs, start the engine and run it without load for about 30 minutes, then perform a crankcase inspection. If all is in order, gradually take the engine on load.

(ii) Electrical Checks

1. Inspect the alternator rotor for any displaced conductors or other abnormal conditions caused by centrifugal forces.
2. Inspect the stator internally to check for any contact with the rotor and resultant damage.
3. Check the condition of the coupling bolts and bearings for any signs of damage.
4. Ensure all electrical connections and components are secure and functioning correctly, with no signs of wear or damage.