Class 2 (2nd Engineer) MEP 📅 Aug 2024

Exam Question

Describe how a jerk type of fuel pump is replaced, making specific reference to initial setting and governor connections. Explain how the actual and effective strokes are adjusted. Identify the common faults of these pumps. State how engine performance is affected by each of these faults and why prompt attention is necessary. (16)

Reference Answer

Replacement of a Jerk Type Fuel Pump
1. Jerk Type Fuel Pump – Description
The jerk type helix-port controlled fuel pump is widely used on slow-speed and medium-speed marine diesel engines .
The quantity of fuel injected and the end of injection are controlled by the helical groove on the plunger , which uncovers the spill port in the barrel .

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