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Old 12-29-2014, 06:35 PM   #21
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Greetings,
Mr. bp. "...This electrochemical corrosion is also known as electrolysis..." from this article: electrolysis in yachts
Time to update your Chem 101.
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Old 12-29-2014, 06:48 PM   #22
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I agree with MYT, that must be a solid shaft and the hose is there for some other, odd, reason. Have you loosened the hose and looked under it?
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Old 12-29-2014, 08:13 PM   #23
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Not trying to start argument but if you have electrolysis aboard a boat (most do ) then the zinc between tranny coupling and stuffing box may not be secure.Still think the rubber hose thing is a great idea.Do not come down too hard on me Sunchaser. LOL
I'll LOL too, dry air corrosion is pretty slow. And the retaining pins are not zinc which is why they hang on the under water shafts for so long even though they are half or more gone.

If not a shaft zinc, then one can use other 2" metal clamping devices if they so choose. Hard to beat the zincs though with them already having a pretty good 2" shaft connection design.
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Old 12-29-2014, 08:25 PM   #24
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Greetings,
Mr. bp. "...This electrochemical corrosion is also known as electrolysis..." from this article: electrolysis in yachts
Time to update your Chem 101.
Just because some boaters website calls it "electrolysis" does not make it so.
There is a scientific definition of the word and it is as stated " a chemical change in an electrolyte caused by the passage of electrical current '.

people who use the term "electrolysis" (Check SAE, US MIl Spec definitions or the International Society of Electrochemistry or the Journal of the American Chemical Society or a host of other reputable organizations ... anything but some boat website.

oh by the way .... NACE (National Association of Corrosion Engineers) does not agree with you (or the boat website)either.

Most people who use this term lack an understanding of electrolytic corrosion, galvanic corrosion and/or stray current corrosion and often confuse them when each has a very specific meaning.

I am hosting the ABYC Marine Corrosion Analysis course at Port Credit Yacht Club in March. this four day course is a bargain at $875us. Send me a pm if you'd like to sign up.
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Old 12-29-2014, 08:35 PM   #25
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Oh for crying out load, it's obviously not a coupler. Nor is it designed to stop the shaft from sliding out IMO. Based on the white patch I see in the photo I'd say it was installed to be used with a photo tach to measure shaft RPM.
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Old 12-29-2014, 09:22 PM   #26
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Did April 1 come early this year?
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Old 12-29-2014, 10:46 PM   #27
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Oh for crying out load, it's obviously not a coupler. Nor is it designed to stop the shaft from sliding out IMO. Based on the white patch I see in the photo I'd say it was installed to be used with a photo tach to measure shaft RPM.



Nice catch.
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Old 12-29-2014, 10:49 PM   #28
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I go with Capt Bill. White spot for a tach. I think it is a rusty coupler on right. Lots of rust makes me like the buy it for 200k vs 695k plan. There is solid shaft alloy under the hose. Detail oriented vessel and engine surveyors are a wonderful thing.
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Old 12-29-2014, 10:50 PM   #29
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Greetings,
"Nice catch." Possibly but not necessarily. Could be part of the hose...

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Old 12-29-2014, 11:03 PM   #30
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If for rotational measurement why not a piece of tape with a mark? Anybody ever seen a piece of hose used with a strobe light?

I suspect a packing gland drip stop which would account for the developing hull rust under it. But why not ask owner?
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Old 12-30-2014, 12:51 AM   #31
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How could a piece of hose clamped tight to the shaft stop drips/spray coming from a stuffing box mounted a foot away?
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Old 12-30-2014, 01:38 AM   #32
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I was trying to guess its purpose as it's patently not a coupling.
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Old 12-30-2014, 05:07 AM   #33
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Its real purpose is to cover up some ugly tattoos. The world needs a lot more rubber hose....
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Old 12-30-2014, 05:19 AM   #34
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Brian,
There is not enough rubber hose to go around.

I had a look at that Roberts on YW and if it is the same boat then I doubt that it is such a shonkey move but I would definitely check it out.
Not a bad looking vessel , shame about the hardtop on the fly bridge.
With a price reduction it would possibly be a really good buy.
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Old 12-30-2014, 06:46 AM   #35
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>I would replace the stuffing boxes with dripless boxes and add new shaft couplers, and . or bail on the whole project...<

Drippless stuffing boxes put the vessel to risk as a bellows leak cam flood more water than 4-5 bilge pumps can handle.

then align the engines to within 10,000ths of true

At what boat yard? most are delighted to get with in 2 or 3 thousanths.
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Old 12-30-2014, 11:22 AM   #36
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Maybe the guy likes to run on one engine only to save fuel. He has read the free wheeling prop may damage the transmission. He wants to lock the shaft with a big pipe wrench but is afraid to damage the shaft so he put on the hose and clamped it with two extra, extra, long hose clamps to protect the shaft?
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Old 12-30-2014, 11:46 AM   #37
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Steve, I had just the same thought! You must be a vey smart man.

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Old 12-30-2014, 12:05 PM   #38
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>I would replace the stuffing boxes with dripless boxes and add new shaft couplers, and . or bail on the whole project...<

Drippless stuffing boxes put the vessel to risk as a bellows leak cam flood more water than 4-5 bilge pumps can handle.

then align the engines to within 10,000ths of true

At what boat yard? most are delighted to get with in 2 or 3 thousanths.

A properly installed and maintained dripless shaft seal sure is a nice add on for a steel hulled vessel.
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Old 12-30-2014, 12:14 PM   #39
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stu:

IMO all that expense is unnecessary. why do you need dripless when gore will do as well? perfection in alignment is for the forum not the boat, what's wrong with the couplers now?
If the boat is working well spend your money on nav tools or something else.
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Old 12-30-2014, 01:14 PM   #40
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Oh for crying out load, it's obviously not a coupler. Nor is it designed to stop the shaft from sliding out IMO. Based on the white patch I see in the photo I'd say it was installed to be used with a photo tach to measure shaft RPM.
It never occurred to me, but I bet you are right!!!! Well done, Sherlock.
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