Wärtsilä System / Package
Wärtsilä EvoTube® Stern Tube System
Patented simplified stern tube shaft line system with inboard seal on the aft bearing housing and a standalone forward bearing; for oil or water lubrication and easy conversion between them.
Description
Wärtsilä EvoTube® is a patented shaft line system based on a conventional stern tube but with significantly fewer components. The inboard seal is mounted directly on the aft bearing housing, and the forward stern tube bearing is replaced by a standalone bearing inside the engine room. The design optimises space and eases maintenance.
Key features
- Suitable for oil and water lubrication, with easier later conversion from oil to water lubrication
- No forward stern tube bearing: fewer parts and less maintenance
- Low risk, based on existing technology
- Frees up cargo space and eases onboard maintenance
Oil-lubricated version
- Stern tube lubricating oil volume reduced by ~90%
- Improved through-life oil quality and simplified oil management during seal maintenance
Water-lubricated version
- Eliminates shaft corrosion; no shaft coatings required
- Full in-water serviceability, including aft bearing replacement
- Compact design
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