Following the failure of one turbocharger on a large, crosshead, main propulsion diesel engine, fitted with multiple turbochargers, which of the following actions should be taken prior to further operation of the engine?

Correct Answer: Option D — All of the above.

Operating a damaged turbocharger without isolating exhaust gas, securing lube oil, and locking the rotor causes catastrophic bearing failure and potential engine room fires. Standard safety protocol mandates blanking the exhaust, halting lube and cooling services, and physically locking the stationary turbine shaft to prevent windmilling damage.