In a diesel main engine, the cause of a sudden load reduction in a cylinder or its total failure may be:

A
Defective or clogged-up fuel valve
B
The fuel pump plunger has seized in the barrel
C
Too low compression owing to worn piston rings leaky inlet or exhaust valves or lack of clearance in the valve actuating gear
D
A and/or B and/or D
E
Noneof the above