Q3. Describe, with the aid of a sketch, the principle of operation of a radial lip stern tube sealing arrangement for an oil filled stern tube, which incorporates an air space and is designed to prevent pollution. (10)
Q3. With reference to stern tube bearings:
(a) explain why white metal lined bearings are susceptible to failure; (5)
(b) outline the merits of non-metallic bearings. (5)
Q3. with reference to oil filled stern tubes:
Describe, with the aid of a sketch, the principle of operation of a combination seal, which incorporates a wrapped bellows radial face seal and a lip seal. (10)
Q2. (a) Sketch an outboard radial lip seal as fitted to an oil lubricated stem tube. (5)
(b) Explain the procedure for replacing the seal sketched in part (a) without removing the tail shaft. (5)
Q2. As Chief Engineer Officer onboard a vessel which has lost 50 litres of lubricating oil from the stern tube system to sea overnight, write a report to the Superintendent Engineer outlining the actions taken to rectify the leakage and any other further recommendations. (10)
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