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Old 20-12-2011, 10:24   #16
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Writing on next haul-out todo list: replace shaft seal bellows.

Thanks for the heads up.

cheers,
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Old 20-12-2011, 10:37   #17
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Re: Modern stuffing box potentially dangerous

Rubber hose came into use with rubber engine mounts and hulls "banana-ing" from rig tension.
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Old 20-12-2011, 10:56   #18
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Re: Modern stuffing box potentially dangerous

Quote:
Originally Posted by avazquez View Post
Standard stuffing box. Simple, reliable, inexpensive. Why change?
Because they drip and make a horrible mess. Replaced it with a Volvo seal and that was the end of the problem. I'll get around to changing it probably at the seven year point.

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Old 20-12-2011, 11:38   #19
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Originally Posted by Pete7

Because they drip and make a horrible mess. Replaced it with a Volvo seal and that was the end of the problem. I'll get around to changing it probably at the seven year point.

Pete
Horrible mess was when the rubber bellow failed in a 50 ft powerboat in my marina. Well I'm sure with good maintenance and replacement at required intervals you can prevent catastrophic failures.
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Old 20-12-2011, 12:20   #20
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Re: Modern stuffing box potentially dangerous

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Horrible mess was when the rubber bellow failed in a 50 ft powerboat in my marina. Well I'm sure with good maintenance and replacement at required intervals you can prevent catastrophic failures.
Same is true of your stuffing box. When was the last time you replaced your hose? This article says every 5 years. That's more often than the bellows.

Service Your Stuffing Box | Cruising World


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Old 20-12-2011, 12:28   #21
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Anybody has statistics? I don't believe more boats with rubber parts at the seal, sink compared to the old grease pot seals.

Also, I have seen many burned up shafts resulting from overtightening the nut on the old seals.

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Old 20-12-2011, 12:35   #22
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Re: Modern stuffing box potentially dangerous

use the gore GFO fiber packing
runs cool
wont score shafts
dripless
uses a standard bronze stuffing box
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Old 20-12-2011, 12:38   #23
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uses a standard bronze stuffing box
Standard? On which boats? I honestly believed that these were not used for new boats anymore....

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Old 20-12-2011, 12:50   #24
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Re: Modern stuffing box potentially dangerous

standard here means normal everyday type thing.

http://www.gfopacking.com/

great packing also works on rudders.

another great cheap product is the plastic shaft bushings instead of expensive bronze-rubber bushes for shafts.
http://www.vesconite.com/
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Old 20-12-2011, 13:04   #25
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Quote:
Originally Posted by sdowney717
use the gore GFO fiber packing
runs cool
wont score shafts
dripless
uses a standard bronze stuffing box
There you go!
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Old 06-02-2012, 00:47   #26
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Re: Modern stuffing box potentially dangerous

I agree that materials technology has now provided a better alternative to the rubber bearing surface, but out of the range of materials available there is also a huge range of performance. You need to check the data as some of the new materials are as different as chalk and cheese, some may be cheaper but I don't believe you get performance and price in the same product. I'm in the commercial vessel bearing business where my customers want long life and less noise/vibration. Search for marine composite bearings and you'll get the list of suppliers. I don't want to promote one above any other, but think you need to be informed of where we are now with material choices.
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Old 06-02-2012, 06:47   #27
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Re: Modern stuffing box potentially dangerous

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I agree that materials technology has now provided a better alternative to the rubber bearing surface, but out of the range of materials available there is also a huge range of performance. You need to check the data as some of the new materials are as different as chalk and cheese, some may be cheaper but I don't believe you get performance and price in the same product. I'm in the commercial vessel bearing business where my customers want long life and less noise/vibration. Search for marine composite bearings and you'll get the list of suppliers. I don't want to promote one above any other, but think you need to be informed of where we are now with material choices.
How does this relate to stuffing boxes?

I searched and found cutlass bearing applications, good.

But I didn't find stuffing box applications.
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Old 06-02-2012, 07:20   #28
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Re: Modern stuffing box potentially dangerous

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How does this relate to stuffing boxes?

I searched and found cutlass bearing applications, good.

But I didn't find stuffing box applications.
It's in response to sdowney717 talking about cheap plastic shaft bushings.
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Old 06-02-2012, 07:26   #29
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Re: Modern stuffing box potentially dangerous

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It's in response to sdowney717 talking about cheap plastic shaft bushings.
So how does the Volvo seal stack up. Volvo recommend 5 years, some folk seem to change them at 7 and others just go on and on. For a simple piece of presumably nylon type material for once volvo don't charge the equivalent to the GDP of a small 3rd world country.

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Old 06-02-2012, 07:39   #30
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Re: Modern stuffing box potentially dangerous

I fixed mine by stuffing liquid teflon into them, but I've never felt good about them.

If you could guarantee perfect shaft alignment, there are a number of good waterproof bulkhead options for a moving shaft used by industry, unfortunately if the shaft is even a micron out of alignment you will have bigger problems than a leak.

The flexible rubber hose, is cheap, easy to replace, and rarely fails. And if it splits, you can save the boat with duct tape.

If someone can come up with a cheap and better alternative, I see a patent opportunity.
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