Class 4 (4th Engineer) MEKG 📅 Jul 2025

Exam Question

(a) Whilst on 'seawatch' you observe that the Oil Mist detector (OMD) in the engine room has triggered an alarm; and in feeling the crankcase doors on the bottom platform, you find that the unit in question feels warmer than the rest. What pre-emptive action will you take as Watch-keeper to bring the situation under control. (10)

(b) Draw a simple line diagram of a 'OMD' and explain it's working. (6)

Reference Answer

### Part (a): Pre-emptive Action for OMD Alarm and Hot Crankcase Door
As the Watch-keeping Engineer, observing an Oil Mist Detector (OMD) alarm combined with a noticeably warmer crankcase door for a specific unit is a critical indicator of a developing hazardous condition, potentially leading to a crankcase explosion. The immediate priority is to manage the situation safely, preventing both mechanical damage and catastrophic failure. The following systematic procedure must be followed:
**1. IMMEDIATE ACTIONS & COMMUNICATION:**
* **Acknowledge the Alarm:** Immediately acknowledge the OMD alarm on the Engine Control Room (ECR) panel.

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