3.Engine speed falls with load indicator remaining in the same position:
Possible causes are :
1.A component of the running gear is hot. Stop the engine immediately.
2.The hydrodynamic resistance of the ship’s hull is increasing.
3.The propeller is absorbing greater power.
4.The propeller shaft friction in the stern tube is excessive.
5.A fuel pump or fuel pipe is defective.
6.The priming plug on a fuel injector valve is either loose or leaking.
7.The holes of fuel valve nozzle are obstructed.
8.Defective scavenge air valves.
9.Defective or fouled turbocharger or air cooler (inadequate air supply).Protective grating before turbocharger may be fouled.
10.Fouled scavenge or exhaust ports.