Class 2 (2nd Engineer) MEKG 📅 Aug 2023

Exam Question

Sketch a sealing arrangement for an oil lubricated stern tube and (16)

(a) Identify the common forms of seal failure.

(b) State how oil loss due to seal failure can be restricted whilst on passage?

Reference Answer

A modern oil-lubricated stern tube sealing arrangement, often of the lip seal type (e.g., Simplex seal), is designed to prevent oil leakage from the stern tube into the sea and to prevent seawater ingress into the stern tube lubrication system. The arrangement consists of multiple seals on both the forward (engine room side) and aft (propeller side) ends of the stern tube.
### Sketch Description
A detailed cross-sectional sketch would show:
* **Propeller Shaft**: The central rotating element.

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