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Old 09-25-2018, 09:08 PM   #6
Lepke
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City: Between Oregon and Alaska
Vessel Name: Charlie Harper
Vessel Model: Wheeler Shipyard 83'
Join Date: Jun 2016
Posts: 3,021
If you have a bearing near the shaft seal, you need some exhaust water piped to lube the bearing, or some other water flow. A bearing far up a shaft tube can boil away the water w/o a forced flow. A shaft seal that doesn't drip can make an air pocket. Some boats have a small scoop facing forward and bonded to the hull with a path to the front of the bearing.
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