Shaft woes, are we talking a total replacement here? - SailNet Community
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post #1 of 16 Old 06-06-2016 Thread Starter
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Shaft woes, are we talking a total replacement here?

Hi All,

I currently looking at a used Tartan (26yrs old) and have a few hangups, the first BIG one being that propeller shaft is corroded between the engine and the stuffing box and saltwater has given it that bright blue hue. Could be caused by lack of maintenance on the stuffing box, or the engine is out of alignment.

Now I've seen what saltwater does to metals and usually at this stage I would think the shaft is compromised and certainly not capable of a long voyage without the risk of more damage/failure, however I'm wondering if something like this be salvaged or if it needs to be replaced.

Here are the photos of the shaft from inside the boat and outside the boat. It looks fantastic from the outside and like new which is weird. But the inside is a nightmare. AFAIK this shaft is one piece (direct drive) so would need haul-out to remove and replace. And might even need to drop the rudder but would need measurements as the engine is mounted more towards the middle of the boat to be certain.

Outside of calling a Marine mechanic (which would be my next move) curious if anyone here has done this procedure, the cost, and know what might be involved with a job this size. Anyway here are the photos:

https://drive.google.com/folderview?...lk&usp=sharing
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post #2 of 16 Old 06-06-2016
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Re: Shaft woes, are we talking a total replacement here?

That blue color, verdigris, is not an indication of a problem. That can happen to copper alloys simply out in the air. Can be polished off if you like. I would leave it. Doesn't mean there isn't some other problem though.

Related comment: Replacing prop shafts is a normal thing on boats. You need to expect this kind of work if you are messing about in boats. Also, a haul-out is not actually required to replace most prop shafts, but it sure helps.

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Re: Shaft woes, are we talking a total replacement here?

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That blue color, verdigris, is not an indication of a problem. That can happen to copper alloys simply out in the air. Can be polished off if you like. I would leave it. Doesn't mean there isn't some other problem though.

Related comment: Replacing prop shafts is a normal thing on boats. You need to expect this kind of work if you are messing about in boats. Also, a haul-out is not actually required to replace most prop shafts, but it sure helps.
I knew the "blue stuff" had a name. And reassuring that it's not an obvious sign of potential failure. Very helpful thanks.
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Re: Shaft woes, are we talking a total replacement here?

Looks like abronze shaft, and the green colour inside the boat is normal. You can use it as is.
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Re: Shaft woes, are we talking a total replacement here?

Probably just surface oxidation but if it looks like it's "peeling" in layers, it could be the sign of electrolytic corrosion, a more serious problem. That shaft log needs some serious cleaning up as do the flange bolts. If you ever need to adjust the packing or get the shaft disconnected to realign, etc., it will be a task. Better to do mechanical stuff like this ahead of time. Maybe replace the flange bolts and nuts and put some anti-seize on em when reinstalling.

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Re: Shaft woes, are we talking a total replacement here?

Looks pretty normal for a bronze shaft. it can be keep a little cleaner but hard to reach and out of sight of mind. what you do not want to see is pink color on the bronze. with the packing leaking a little water ( it should be dripping when turing ) it is hard to keep them from corroding. change to a stainless steel shaft and a dripless seal and it will stay a little cleaner. its only money.

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Re: Shaft woes, are we talking a total replacement here?

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That shaft log needs some serious cleaning up as do the flange bolts. If you ever need to adjust the packing or get the shaft disconnected to realign, etc., it will be a task. ...Maybe replace the flange bolts and nuts and put some anti-seize on em when reinstalling.
Good thoughts. The flange is quite rusted, and shaft does look flaky. Always hard to judge unless in-person. these were photos from the broker.
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Re: Shaft woes, are we talking a total replacement here?

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its only money.
...is it ever. Dripless...hmmm.
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Re: Shaft woes, are we talking a total replacement here?

Does that hose have 10/75 written on it? 40 years in service?

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Re: Shaft woes, are we talking a total replacement here?

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Does that hose have 10/75 written on it? 40 years in service?
The boat is 26yrs old.
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corrosion , propeller shaft , shaft , tartan

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