- Oil to be used must not attack sealing Rings. Generally oil used for main propulsion unit is SAE 30. Remove screw plug and fill up the stern tube oil. Oil pressure must amount to only 0.2 – 0.3 Kg/cm² more than SW pressure.
- Preheated to 60 – 70°C when viscose oil is used or low temperature prevails.
- Remain in this condition for several hours (says overnight) and turn engine by Turning Gear to change the shaft position 3 – 4 times.
- Check oil leakage from Drain Plug and if it is all right, fit back Drain Plug and fill oil from venting and Filling Plug and close.
- Forward Seal is fitted.
1. High cost: Manganese bronze is a costly alloy, making it less economical for large propellers. 2. Low strength-to-weight ratio: Compared to other propeller materials like nickel-aluminum bronze or stainless steel, manganese bronze has a lower strength-to-weight ratio. 3. Susceptible to corrosion: Manganese bronze can corrode in seawater, especially when exposed to high velocities and turbulence. 4. Poor cavitation resistance: Manganese bronze is more prone to cavitation damage than other materials. 5. Difficult to cast and machine: Manganese bronze is challenging to cast and machine, making it less desirable for complex propeller geometries. 6. Limited weldability: Manganese bronze has poor weldability, making repairs and modifications difficult. Nickel-aluminum bronze or stainless steel are commonly used for propellers due to their: - High strength and durability - Excellent corrosion resistance - Good cavitation resistance - Ease of casting and machining - Weldability
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