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Class 2 (2nd Engineer) MEKG 📅 Feb 2024

Exam Question

(a) Sketch and describe a Pilgrim Nut for securing a propeller to the screw shaft. (8)

(b) Describe how this device is used to loosen the propeller on the shaft when removal or inspection becomes necessary (4)

(c) Give reasons why this method is considered to be superior to all other methods. (4)

Reference Answer

### (a) Sketch and Describe a Pilgrim Nut
**1. Concept and Principle:**
The Pilgrim Nut is a patented hydraulic device designed to facilitate the fitting and removal of large components, such as propellers, onto tapered shafts. It operates on the principle of a hydraulic jack, utilizing a high-pressure grease medium to generate an immense, controllable axial force. This force is used to drive the propeller up the shaft's taper to achieve a precise interference fit, which is essential for transmitting the engine's torque without relying on keys.
**2. Construction:**

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