Class 2 (2nd Engineer) MEKG 📅 Mar 2023

Exam Question

Sketch an arrangement of propeller shaft and stern in which the tube is filled with oil and

(a) Describe the attention it requires at sea

(b) Suggest a method of repair when the rubbing surfaces Of the Oil seal get estate the defects that you would look for when the shaft is withdrawn in the dry-dock.

Reference Answer

### Arrangement of an Oil-Filled Stern Tube
An oil-lubricated stern tube arrangement is designed to support the propeller shaft and provide a seal against the ingress of seawater and the egress of lubricating oil. The system consists of a cast iron or fabricated steel stern tube, which houses forward and aft white metal bearings. Lubrication and cooling are provided by oil, circulated from a gravity header tank that maintains a positive pressure differential over the external seawater pressure.
**Key Components:**
* **Stern Tube:** The main housing fixed to the stern frame.

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