The propeller enters the shaft outside from the ship, acting as its barrier. In case of water-cooled Stern Tube, Gland packing is used to prevent water ingress inside. But incase of Lignum vitae bearing, some water is allowed to go.
In case of Oil cooled Stern tube, the rubber seals fitted with springs are used.
In case of Oil cooled Stern tube, the rubber seals fitted with springs are used.
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