Class 4 (4th Engineer) MEKM 📅 Dec 2025

Exam Question

Discuss the precautions, which can be taken to minimize the possibility of a diesel engine crank case explosion and the transmission of dangerous flame into the machinery space.

(a) by design and equipment (8)

(b) by operating personnel (8)

Reference Answer

### Introduction to Crankcase Explosions
A crankcase explosion is a severe and dangerous event in a marine diesel engine. It occurs when a combustible mixture of lubricating oil mist and air inside the crankcase is ignited by a source of high heat. For an explosion to occur, three elements, known as the 'fire triangle', must be present:
1. **Fuel**: Atomized or vaporized lubricating oil (oil mist).
2. **Oxygen**: Air present within the crankcase.

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