Class 4 (4th Engineer) MEP 📅 Dec 2025

Exam Question

(a) Explain with a sketch showing the components of an auxiliary engine fuel valve, the complete maintenance procedure including the removal of the fuel valve, pressure-testing and overhaul. (12)

(b) What are the precautions to be taken before installation of a fuel valve on the Cylinder head? Indicate the special tools that may be required for the fuel valve removal and overhaul. (4)

Reference Answer

### (a) Auxiliary Engine Fuel Valve: Components and Maintenance (12 Marks)
An auxiliary engine fuel valve, or injector, is a critical component responsible for delivering a precise quantity of fuel into the combustion chamber at the correct pressure, time, and in a finely atomized spray pattern. Its correct functioning is paramount for engine efficiency, power output, and emissions control.
#### 1. Components of a Fuel Valve
A typical fuel valve consists of the following key components assembled within the injector body or holder:

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