Q8
(a) Sketch a sealing arrangement for an oil lubricated stern tube.
(4)
(b) Identify the common forms of seal failure.
(4)
(c) State how oil loss due to seal failure can be restricted whilst on Passage.
(4)
(d) How the aft bearing is designed to minimize the concentrated load?
(4)
Reference Answer
### (a) Sketch a sealing arrangement for an oil lubricated stern tube. A typical oil-lubricated stern tube sealing arrangement, such as a Simplex-type seal, consists of several key components designed to prevent oil from leaking out into the sea and seawater from leaking into the stern tube. **Key Components and Arrangement:** 1. **Chrome Steel Liner:** A hard, corrosion-resistant chrome steel liner is shrunk-fit or keyed onto the propeller shaft in the way of the seals. This provides a smooth, durable running surface for the seal lips, protecting the main propeller shaft from wear.
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