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Old 16-01-2011, 08:55   #256
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zee, not actually seeing the current tube, I can't be sure. Suggest you bounce that off buck algonquin or sdmx. It might depend on diameter of your shaft, and how close you can come to it with a pvc tube. Certainly the pvc should have long life in salt water. You might be able to afix neoprene washer and pvc fitting like that used below sinks to provide outer seal -- that is if you can match shaft diameter.
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Old 16-01-2011, 09:09   #257
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i wish i could see this... i am good at MaGyvering stuff...

is there a sketch or picture or what this does or how it is put together? and or how it is supposed to be...
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Old 16-01-2011, 09:41   #258
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i dont have any pix of this--but the tube runs 30 inches between shaft log wherein the cutlass bearing lives, and to the beam at /inwhich the packing gland, which is actually a rudder packing gland, connect with the tube, at the packing gland.....is allthis tube does.. connect the two so water stays where it belongs. is only bit of bronze not protected by zincs in entire boat......
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Old 16-01-2011, 09:46   #259
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how is the tube connected? and or or how would you get the pvc or marine graded hose onto that shaft?

it sounds like it is just a cover? does it contain or hold back water? what is it's purpose? safety? to keep things and people from touching the shaft as it spins?

is it necessary?
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Old 16-01-2011, 09:52   #260
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it keeps water out of boat so davey jones doesnt add it to his locker.
still figuring out the means of connection..
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Old 16-01-2011, 09:55   #261
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How is it sealed on the ends?
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Old 16-01-2011, 09:59   #262
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exactly...

If it doesnt seal at the hull, then it must seal further in, and then must have some type of seal, inner and outer, of the shaft to spin, and for the tube to seal on the outside...

sounds like a crucial part, and not something i would want to jerry rig... I wont mind jerry rigging something cosmetic, but, when it comes to seals, you need neoprene or rubber or other something or other...

tech talk
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Old 16-01-2011, 10:22   #263
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Originally Posted by zeehag View Post
kinda wondering if the 30 inch tube could be made of pvc, --- been thinking on htis--- mebbe wouldnt have somuch electrolysis problem... and i think there isnt any stress or twist or what have you on this tube.......
Is you cutlass bearing in the stern tube? Mine is. Once the set screws on the cutlass bearing came loose and the bearing walked up the tube until the prop shaft whip (I assume) bound up everything tight and stopped the engine. Some torque on the tube then. I've seen diagrams from some boats where the stern tube is stepped so the cutlass bearing can't move up the tube. In any event if the cutlass bearing is in the stern tube there is some load.

The previous owner replaced the bronze stern tube that had corroded through with G10 epoxy tube in my boat. I've been told this is a common material for this use these days, but I haven't investigated to find out if this is true.

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zee, that should work well, but I think I would prefer a marine rated hose (below waterline rated). Of course you would have to come up with fittings for the ends. Finding a replacement for the tube you have may be a big problem.
How do you keep the hose perfectly straight so it doesn't rub on the shaft and wear through?

John
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Old 16-01-2011, 10:25   #264
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Some how I thought this was about a stuffing box.
Heres my favorite **** hit the fan confused fallback.

Go placidly amid the noise and haste,
and remember what peace there may be in silence.

As far as possible without surrender
be on good terms with all persons.
Speak your truth quietly and clearly;
and listen to others,
even the dull and the ignorant;
they too have their story.
Avoid loud and aggressive persons,
they are vexatious to the spirit.

If you compare yourself with others,
you may become vain and bitter;
for always there will be greater and lesser persons than yourself.

Enjoy your achievements as well as your plans.
Keep interested in your own career, however humble;
it is a real possession in the changing fortunes of time.
Exercise caution in your business affairs;
for the world is full of trickery.
But let this not blind you to what virtue there is;
many persons strive for high ideals;
and everywhere life is full of heroism.

Be yourself.
Especially, do not feign affection.
Neither be cynical about love;
for in the face of all aridity and disenchantment
it is as perennial as the grass.

Take kindly the counsel of the years,
gracefully surrendering the things of youth.
Nurture strength of spirit to shield you in sudden misfortune.
But do not distress yourself with dark imaginings.
Many fears are born of fatigue and loneliness.

Beyond a wholesome discipline,
be gentle with yourself.
You are a child of the universe,
no less than the trees and the stars;
you have a right to be here.
And whether or not it is clear to you,
no doubt the universe is unfolding as it should.

Therefore be at peace with God,
whatever you conceive Him to be,
and whatever your labors and aspirations,
in the noisy confusion of life keep peace with your soul.

With all its sham, drudgery, and broken dreams,
it is still a beautiful world.
Be cheerful.
Strive to be happy.

[Edit: Lest any reader think that sabray, brilliant though he may be, is the author of the above, it is actually the prose poem "Desiderata" of Max Ehrmann, published in 1927. TJ ]
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Old 16-01-2011, 10:25   #265
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one end is sealed via cutlass bearing over shaft thru shaft log, a heavy cast bit of bronze, and the other is sealed with /by packing gland... thru a beam/bulkhead.....i understand the packing gland end was spozed to bbe a screw in piece, but i also know the packing gland on my boat is a rudder flanged unit. i didnt see any way to screw that into the tube or onto it, so i am not certain how that bit connects... still figgering---
there is no hose...


IS about stuffing box.. and the bits making it not function..changing out this in water was original plan. i learned of this tube's problem when i was looking closely a my packing gland inside my boat.
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Old 16-01-2011, 10:51   #266
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ZZzzz- Go to google images and do searches like "cutlass bearing."
Maybe you'll see something familiar that will help you out.
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Old 16-01-2011, 10:59   #267
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Re-Packing A Traditional Stuffing Box Photo Gallery by Compass Marine at pbase.com

does it look like these pics???

is this the tube/hose thing you are looking at?
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Old 16-01-2011, 11:02   #268
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PSS Shaft Seal Installation Photo Gallery by Compass Marine at pbase.com

or these?
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Old 16-01-2011, 11:05   #269
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Yeah, there was some talk about it "screwing in" and so thought it might have been a piece between the stern tube and the packing gland. Now I think it is part of the stern tube and probably extends from the packing gland to where the shaft exits the keel. That whole stern tube would have to be replaced and an epoxy tube may be the best way to go. However, where does one get an epoxy tube that would do the trick? I imagine it would have to be custom made.
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Old 16-01-2011, 11:08   #270
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neither one--is a rudder flanged stuffing box --- and there are many feet of shaft afore the stuffing box, then a beam/bulkhead after which is stern tube for 30 inches afore the shaft log which is spozed to house cutlass ..lol.. then abaft tat is ocean, prop, and 4 inches abaft that, rudder.

deep frz, i fear you are correct--mebbe i should just find me a bronze one and affix dry zincs to it abaft the packing gland. got my fingies crossed that buck algonquin comes up with one...... (praying to gods of formosa boats)......
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