What is "wet stacking" in a diesel engine?

Wet stacking refers to an accumulation of unburned fuel in the exhaust system of a diesel engine. This condition typically occurs when a diesel engine is run at low loads or for short periods, preventing it from reaching the optimal operating temperature. Under these circumstances, the engine does not burn off all the fuel efficiently, resulting in excess fuel that collects in the exhaust system instead of being completely combusted.

When wet stacking occurs, it can lead to several issues, such as reduced engine performance, increased emissions, and potential damage to the exhaust components. This makes it vital to operate diesel engines under appropriate load conditions to ensure complete combustion and prevent wet stacking. Good maintenance practices, including regular engine load tests and proper operational procedures, can help mitigate this problem, ensuring the longevity and efficiency of the diesel engine.