Class 4 (4th Engineer) MEKM 📅 Sep 2024

Exam Question

(a) Describe what is nozzle burning of Fuel Injectors and causes of nozzle burning on marine Diesel engine. (6)

(b) What investigations are required to find causes for nozzle burning? (6)

Reference Answer

### (a) Description of Nozzle Burning and its Causes on Marine Diesel Engines
**Description of Nozzle Burning:**
Nozzle burning refers to the thermal damage and material degradation observed at the tip of a fuel injector nozzle. This phenomenon results from the nozzle tip being subjected to excessively high temperatures, often exacerbated by poor combustion conditions and/or inadequate cooling. The damage can manifest in several ways:
* **Erosion and Pitting:** Loss of material, particularly around the injector spray holes, leading to enlargement and deformation of the holes.

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