The stern tube is filled with oil, grease or water and forms a barrier between the water outside and the engine room inside the vessel. The stern tube mainly consists of the following parts:


  • the tube itself
  • connection flanges (forward and aft)
  • bearings (forward and aft)
  • smaller pipes for temperature sensors
  • lubrication of the aft seal (or drain pipes for air-type seals)
  • forward seal (engine room side)
  • aft seal (water side)
Shaft with stern tube and bearings from Lagersmit

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