Class 2 (2nd Engineer) MEKG 📅 Apr 2024

Exam Question

Sketch a sealing arrangement for an oil-lubricated stern tube. Identify the common forms of seal failure; State how oil loss due to seal failure can be restricted whilst on passage? What is the material used for sealing rings and propeller shaft liner? (16)

Reference Answer

### **A. Stern Tube Sealing Arrangement**
A modern oil-lubricated stern tube sealing arrangement, often of the lip seal type (e.g., Simplex or Kobelco), 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 a forward seal and an aft seal.
#### **1. Aft Seal Arrangement (Propeller Side)**
This is the primary barrier located at the outboard end of the stern tube. It typically consists of:

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