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Old 03-03-2016, 12:52 AM   #21
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one seal is where the shaft exits the hull. if that seal is compromised then water enters into the shaft area. the second seal is the one where the shaft enters into the bilge area. the packing gland may be fine but the seal holding the packing gland is not.
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Old 03-03-2016, 12:25 PM   #22
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Thanks 37Pacific. I wonder if most trawlers (or boats in general) have these seals? I've always thought that water was kept out of the boat because of the tight packing material forced tight by the packing gland collar. Can anyone shed light on this? It is important because several people have commented that the shaft log, cemented or glassed in tight, could be failing due to material/bonding failure of the log where it enters the hull, none mentioning "seals."
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Old 03-03-2016, 01:10 PM   #23
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I have had boats with seals on the outside or the inside never both.




Double seals is a new concept to me. Sounds like the trapping of water in between with no flow would encourage corrosion.
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Old 05-29-2017, 11:54 PM   #24
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I found this thread and will add to it here since I searched "shaft log" and this thread seemed the most appropriate. On The Promise I pulled the sole up in the aft cabin to inspect something else and notice the shaft tube looked a little cruddy. Feeling around it I noticed it was moist on the underside, and using a rag to clean it up a but came away with some rust.

Forward of this, through the bulkhead is the stuffing box, and all that looks fine. The engine turning 1200rpm produces one drip every 4-5 seconds. So I'm not sure where the moisture on the shaft tube/log is coming from. The tube was painted at some time in it's life, where the paint had peeled off I can see it appears to be some kind of stainless, so I'm not sure why its rusted.

And this situation may have been going on for years.

Any thoughts?

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Old 05-29-2017, 11:57 PM   #25
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Stainless will rust if it does not have a supply of oxygen. If it is submerged in stagnent water, the water oxygen content will drop and then the stainless will rust.
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Old 05-30-2017, 01:19 AM   #26
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Thanks Dave. I'm trying to understand what I'm looking at. It seems at the aft the shaft log slides into the end of the square bronze plate, as can be seen on the forward side. Could it be that the end of the shaft is not what the hose clamps are clamping to as is what should be typical? Does that make sense?
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Old 05-30-2017, 02:52 AM   #27
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Not sure. I have not seen a shaft log like yours before. There are a bunch of different types.
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Old 05-30-2017, 06:38 AM   #28
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Most likely the stainless section threads into the square bronze fitting where the hose attaches. Interesting there is no water supply plumbed into the shaft log. Typically some raw water from the engine is diverted to flow through the shaft log.

The shaft log pipe is likely corroded through in a spot and oozing. It is not under any kind of load so you could seal it and go on with your life unless probing indicates the pipe might crumble and fail. If that is the case you will need to replace it.
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Old 05-30-2017, 09:06 AM   #29
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Thanks bglad, that's the conclusion I'm coming to as well.
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Old 05-30-2017, 09:48 AM   #30
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Keep us informed as to what you find.
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