What can happen if a diesel engine is shut down immediately after full-load operation?

Shutting down a diesel engine immediately after operating at full load can lead to turbo seizure or damage from heat due to the sudden loss of cooling and lubrication that occurs when the engine is turned off. Diesel engines, especially those equipped with turbochargers, rely on the continuous circulation of oil to lubricate moving parts and to help dissipate heat generated during operation.

When an engine is running at full load, temperatures can rise significantly, particularly in the turbocharger. If the engine is shut off abruptly, the flow of oil to the turbocharger ceases, which can result in the turbine continuing to spin for a short time due to inertia without adequate lubrication. This can lead to excessive heat buildup and potential damage to the bearings and other components within the turbocharger, ultimately leading to seizure or failure.

Ensuring that the engine is allowed to idle for a short period after full load operation allows for required cooling and helps maintain proper lubrication flow to critical components, thus preventing the risk of turbo damage and prolonging the lifespan of the engine.