When is the engine checked for dead cut?

The correct timing for checking an engine for dead cut is during slow running. At this stage, the engine operates at a reduced speed, which helps in identifying issues related to misfiring or the effective functioning of individual cylinders. When an engine runs slowly, it allows for a clear observation of each cylinder's contribution to the overall performance. This is important because any faults that may not manifest under higher RPMs can become apparent during slow operation.

Conducting a dead cut check in this phase makes it possible to systematically disable each cylinder and observe the corresponding changes in engine behavior, thereby identifying any cylinder that is not performing as expected. This kind of diagnostic is essential for maintaining engine efficiency and reliability, particularly in reciprocating engines, where individual cylinder performance is critical to overall engine function.