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Old 15-05-2013, 22:00   #31
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Re: Dripless Shaft Seal Inspection & Maintenance?

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Originally Posted by delmarrey View Post
I think I would be checking your motor mounts to see if the motor is moving when under power. It sounds like your bellows was loosing it's pressure. Unless this is a power boat with lots and lots of thrust.
No motor mounting issues.. and it leaked often while under sail.. the bellows had gone sour and any type of presure from under the boat caused it to leak.. i didnt like the idea of being couple hundred miles offshore when it decided to give up... Like i said, i'll go back to the old style and carry little extra packing with me.. i know i can repare the old style anywhere i go...
Not saying the dripless is wrong, just wrong for my likes........
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Old 15-05-2013, 23:24   #32
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Re: Dripless Shaft Seal Inspection & Maintenance?

Some bellows go bad fast due to fuel oil or other chemical contamination. Also on high power motor craft with high rpm the cooling water is pumped in from motor and at high rpm the pressure may overload the bellows. All in all drip-less is a over complication and potential danger popular as a lazy man's gadget. Boating seems to be going more and more in the push button direction. I am a CGAUX VSC examiner and I find people who own boats with drip-less systems who don't have a clue how they work or how to maintain. Some don't even know they are on the boat or how long they have been there without maintenance. Considering the implications if and when the unit fails not good. If a standard shaft gland starts to fail you get a leak if a drip less lets go you get a new boat if you survive the incident. As these units start to age and get into the 20 year old range I think we will see more of this problem.
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Old 16-05-2013, 00:03   #33
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Re: Dripless Shaft Seal Inspection & Maintenance?

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Originally Posted by eyschulman View Post
Some bellows go bad fast due to fuel oil or other chemical contamination. Also on high power motor craft with high rpm the cooling water is pumped in from motor and at high rpm the pressure may overload the bellows. All in all drip-less is a over complication and potential danger popular as a lazy man's gadget. Boating seems to be going more and more in the push button direction. I am a CGAUX VSC examiner and I find people who own boats with drip-less systems who don't have a clue how they work or how to maintain. Some don't even know they are on the boat or how long they have been there without maintenance. Considering the implications if and when the unit fails not good. If a standard shaft gland starts to fail you get a leak if a drip less lets go you get a new boat if you survive the incident. As these units start to age and get into the 20 year old range I think we will see more of this problem.

I don't see why most of your arguments (except cooling) don't also apply to stuffing boxes. Melt your stuffing box hose with chemicals and you're in the same boat. Improper installation of a PSS in a high power boat is a non-starter, that's not the fault of the PSS. You say it's a lazy man's gadget, then say it needs maintenance. Over-complicated? It's a bellows, carbon ring and a steel donut. I didn't know how to properly maintain a stuffing box any more than I knew how to maintain a PSS when I first got on a boat with one. I learned, both. Those that won't learn, won't learn either system. Why would they know how long the stuffing box hose was on a new to them boat any better than a PSS bellows?

I actually see that a stuffing box with the new packing material is a good solution. My boat came with a PSS, it works, it isn't getting tossed. I have a plan for if the bellows breaks, just as I would have a plan for if the stuffing box hose were to break.

Give the Coasties a downcheck:
http://www.shaftseal.com/system/atta...__low_res_.pdf
Governments and agencies that have installed the PSS Shaft Seal include:
United States: Navy, Coast Guard, Corps of Engineers
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Old 16-05-2013, 00:43   #34
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Re: Dripless Shaft Seal Inspection & Maintenance?

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I actually see that a stuffing box with the new packing material is a good solution.
Me too, but then I'm not a fanatic about a dry bilge. My last boat had a PSS dripless system, but the "new" boat uses the "new" packing material. In the long run, I'm happier with it.
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Old 16-05-2013, 01:00   #35
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Re: Dripless Shaft Seal Inspection & Maintenance?

I've been back in the water now for a month. One of the refits was removing the drip-less and installing a regular stuffing with "the new packing stuff"...Teflon, I think. You have to be carefull that you get the box on straight and there is no side loading of the shaft. This happened on mine. Because the rubber hose was slightly larger than my metric shaft log, I had to use those t-bolt clamps to get them tight enough. When I did tighten it up, it biased the shaft over. When I ran it in gear, the bronze nuts felt slightly warm to the touch after 5 minutes. So in the water, I loosened everything up and re tightened. Runs cool now...I'm happy and sleep at night.
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Old 16-05-2013, 05:29   #36
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Re: Dripless Shaft Seal Inspection & Maintenance?

I presume Dockhead that they are PSS seals, could be Halyard etc

dave
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Old 16-05-2013, 13:33   #37
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Re: Dripless Shaft Seal Inspection & Maintenance?

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I presume Dockhead that they are PSS seals, could be Halyard etc

dave
I think it is a PSS, although my water lift mufflers are Halyard (and in fact, my actual boat is the photo model for the Halyard water lift system).
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Old 16-05-2013, 13:35   #38
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Re: Dripless Shaft Seal Inspection & Maintenance?

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. . . I am a CGAUX VSC examiner and I find people who own boats with drip-less systems who don't have a clue how they work or how to maintain. . .
Yep, guilty as charged . . .
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Old 16-05-2013, 15:13   #39
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I have a ManeCraft dripless that i love. It had 7 years wear when we bought the boat and we added 5 years and 8,000 miles/ 500+ engine hours.

Our system has two wear modalities:

1. The copper to copper strip between the shaft bellow and the wngine bellows

2. The rubber decaying due to age

Neither of these was an issue and the system had 30,000 miles on it when we bought the boat.

We changed it in the water and it was only two jubilee clips (hose clamps) and lossening and easing the shaft back a bit...
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Old 27-05-2013, 16:40   #40
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Re: Dripless Shaft Seal Inspection & Maintenance?

and the same applies to boats with stuffing boxes..

at the end of the day there are folks who bother to learn and know about their boats and then there are those who dont.... it has nothing to do with a dripless/stuffing box discussion

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I find people who own boats with drip-less systems who don't have a clue how they work or how to maintain. .
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Old 10-07-2013, 09:36   #41
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Re: Dripless Shaft Seal Inspection & Maintenance?

Mine came with PYI dripless installed in 2003.

Last Oct, Surveyor said the unit is dripping some water. The ss collar can come loose. PYI now sells an optional ss clamp to prevent the ss collar from moving - just in case the set screws come loose.

Alternatively, a cheaper method I read is to use a hose clamp after ss collar - another project for this weekend.

Got myself a new bellow, carbon and ss collar set ready for haul out next month on the slipway at the yacht club.

Eric
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Old 10-07-2013, 09:50   #42
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Re: Dripless Shaft Seal Inspection & Maintenance?

For those who think a drip less bellows is the same as rubber hose on a standard box I suggest you take a look at both items side by side.
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Old 10-07-2013, 10:04   #43
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Re: Dripless Shaft Seal Inspection & Maintenance?

The only advantage I have found a stuffing box has over a dripless seal is that it can take more abuse. If one has a smooth running drive train then a thick bellows/hose is not necessary. The water pressure at the depth of most stern tubes is about 15 psi hardly enough to pop a ballon.
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Old 10-07-2013, 10:24   #44
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Re: Dripless Shaft Seal Inspection & Maintenance?

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The only advantage I have found a stuffing box has over a dripless seal is that it can take more abuse. If one has a smooth running drive train then a thick bellows/hose is not necessary. The water pressure at the depth of most stern tubes is about 15 psi hardly enough to pop a ballon.
15 psi??? Surely you jest...

Depending on the boat, one to two psi is more like it.

Jim
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Old 10-07-2013, 10:28   #45
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15 psi??? Surely you jest...

Depending on the boat, one to two psi is more like it.

Jim

Thank you Jim!!

15 psi is 10M or 33' down!!!!
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