The sequence of events in a cycle within 4 stroke diesel engine is: 1.The piston is forced down at BDC (Bottom Dead Center) exhaust valve opens 2.The piston is at the top of its stroke, TDC (Top Dead Center), inlet valve opens, fresh air is drawn 3.Pressure is high in the gases 4.Fuel is injected as the piston reaches TDC, to start the combustion 5.Inlet valve opens, fresh air is drawn as the piston moves down 6.At the bottom of the stroke BDC inlet valve closes and the air in cylinder is compressed as the piston rises

A
2-5-6-4-3-1
B
2-5-6-4-1-3
C
2-6-5-4-3-1
D
5-2-4-6-3-1
E
5-2-6-4-1-3