Shutting down a diesel engine immediately after full load operation may result in

• A. Engine seizure
• B. Turbo seizure
• C. Oil leakage
• D. Electrical fault

Answer: (B)

After full-load operation, the turbocharger is spinning at very high speed and running extremely hot; its bearings rely on a continuous oil supply for cooling and lubrication. If you shut the engine down immediately, oil pressure drops quickly and lubrication to the turbo bearings is lost while the turbine and housing are still hot. That combination of rapid cooling and oil starvation can allow the bearing surfaces to seize, hence a turbo seizure.

That’s why operators are often advised to let the engine idle for a short period after heavy use, so the turbo slows down gradually and the oil can continue to circulate and cool things down. The other options don’t fit this specific failure mode: engine seizure would come from lubrication or cooling issues affecting the engine itself, oil leakage isn’t a direct consequence of an immediate shutdown, and an electrical fault isn’t tied to shutting down after high load.