Class 4 (4th Engineer) MEP 📅 Aug 2022

Exam Question

(a) Sketch a transmission shaft coupling which enables the propeller shaft to be withdrawn outboard. (8)

(b) (i) Describe the coupling and the method of fitting and dismantling. (4)

(ii) State how the grip of the coupling can be checked when fitted. (2)

(iii) State what safety precaution should be taken when dismantling the coupling. (2)

Reference Answer

### (a) Sketch of a Hydraulic Muff Coupling
A sketch would show a cross-section of the coupling joining two shaft ends (e.g., tailshaft and intermediate shaft). The key components to be illustrated are:
* **Two Shaft Ends:** Shown abutted together.
* **Inner Sleeve:** A thin-walled steel sleeve with a cylindrical bore (to fit over the shafts) and a tapered outer surface.

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