Question 1

During your oral exam you are asked to explain the function of a turbocharger and what symptoms might indicate turbocharger fouling or bearing wear.

Accepted Answer

The turbocharger uses exhaust gas energy to drive a compressor that increases the density of air supplied to the cylinders, improving combustion efficiency; fouling (on the turbine or compressor side) typically presents as reduced boost pressure and rising exhaust temperatures for a given load, while bearing wear may present as increased vibration, abnormal noise, or excessive shaft play Turbocharger fouling restricts gas flow on the turbine side or air flow on the compressor side, reducing boost pressure and forcing the engine to run with a less efficient air/fuel ratio, which manifests as rising exhaust temperatures and reduced performance for the same fuel rack setting. Bearing wear, often from lubrication failures, presents through vibration and noise changes that should be picked up during routine monitoring rounds — early detection of either fault through trend monitoring (boost pressure vs load, exhaust temps) prevents progression to a catastrophic failure that could damage the turbine wheel and send debris into the engine.

Question 2

You're draining a thermal oil system that was running normally a short time ago. Before opening the drain point, what should you confirm?

Accepted Answer

That the system has cooled and depressurised, and you are positioned clear of the drain point's discharge path On the dredger MV Amazone, two crew members draining a thermal oil system after months of contamination were sprayed with hot oil, suffering severe burns. The investigation found company procedures lacked clear instructions for safe drainage — confirming the system has cooled and depressurised, and standing clear of the discharge path, are essential before opening any drain point on a hot oil system.

Question 3

A thermal oil system has been contaminated and needs draining for cleaning. The written procedure tells you to open the drain valve but doesn't specify a cooling-down period or PPE. What should you do?

Accepted Answer

Treat the gap as a hazard in its own right: apply a suitable cooling/depressurising period and full PPE before proceeding, and raise the procedure gap with the Chief Engineer The FEBIMA investigation into the MV Amazone incident found that although the crew followed company procedures, those procedures lacked clear instructions for safely draining a thermal oil system. A procedure that's silent on cooling time and PPE for a hazardous task is a gap to be closed before the job starts — not a green light to skip those precautions.