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Class 2 (2nd Engineer) MEKM 📅 Sep 2025

Exam Question

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

(b) Identify the common forms of seal failure.

(c) State how oil loss due to seal failure can be restricted whilst on Passage.

(d) How the aft bearing is designed to minimize the concentrated load?

Exam question diagram

Reference Answer

(a)
(b) Common forms of seal failure in a stern tube
Loss of elasticity in seal material – Nitrile rubber seals may lose their elastic properties over time, reducing their sealing effectiveness.
Surface damage to chrome liner – Grooving or scoring of the chrome liner can impair sealing surfaces, leading to leakage.

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