Nice video captain Li. Have been seeing your video for months.. this video reminds me memories as a service engineer for sterntube. Anyway seals sit on liner. Don't not sit on the shaft. There is also many type of seal system. E.g air lubrication, oil lubrication and water lubrication. Agree with you is hard to explain it clearly on the video.. Lastly.. thumbs up on all of your video.
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