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.

A failed multi-turbocharger must be mechanically locked, exhaust blanked, and lubrication/cooling isolated to prevent catastrophic bearing failure, oil leaks, and exhaust gas short-circuiting into the engine room.