PYI dripless seal leaking - Page 2 - SailNet Community
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post #11 of 19 Old 01-11-2010
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The "offical" time is 6 years for service

Do you have a vent hose as some dont have it ? i have seen one case were the air from the diver cleaning the boats bottom made a unit run dry and dammage it as it had no vent and it required a manual burping

The unit in the Cal i am repiaring right now had a bellows that was rock hard

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If a dirty bottom slows you down what do you think it does to your boat
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post #12 of 19 Old 01-11-2010 Thread Starter
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Thanks for all the help

Yes, the hose clamps are tight. I don't believe that is an issue, although I will give them another tweak this weekend. I'm also going to check for debris between the bellows and the metal. I don't believe I have a vent hose. I don't see anything that looks like one. I've also got to do some more studying: I don't understand what you all are saying about sliding parts. Rotating the shaft had a noticeable effect on the drip, so I'm going to start looking at the fit of the parts. Thanks again for all the help, and especially for the long description and the pictures, Maine Sail.
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post #13 of 19 Old 01-11-2010
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Quote:
Originally Posted by drynoc View Post
I don't understand what you all are saying about sliding parts.
During installation the stainless rotor is slid down the shaft and tightened in place to hold the bellow in compression. If someone did not install the rotor set screws properly, or re-used them, the rotor can slide back up the shaft taking pressure off the bellows and cause a leak.

The black tape is the mark where the rotor sits without any pressure on the bellows. This photos shows the bellows compressed. PYI gives specific distances for compression in their instructions.

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post #14 of 19 Old 01-12-2010 Thread Starter
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I'm beginning to get it

Thanks again, Maine Sail. I'm a little slow on the uptake, but I am beginning to catch on. I'll have to take a fresh look at my setup this weekend. I didn't install the system, so I don't know it very well.
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post #15 of 19 Old 01-12-2010
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Not all versions have a vent hose, at least they didn't 10 years ago.

Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
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post #16 of 19 Old 01-12-2010
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Not all versions have a vent hose, at least they didn't 10 years ago.
All the new ones do. They stopped making the version without the vent hose.
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post #17 of 19 Old 01-18-2010 Thread Starter
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I did it

It was tough, but I pulled through. In a truly heroic effort, I managed to fix the leak. After hours of research, and with no help from long descriptions or pictures or pointers from anyone here, I solved the problem. I poked, prodded, felt here and there, and finally pulled the carbon seal away from the stainless steel rotor to let water flow in quickly, and whatever was causing the leak washed away. As soon as I let go, the leak was stopped. Kudos to me. I'm the greatest. I don't know how I do it sometimes.
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post #18 of 19 Old 01-19-2010
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dripless

When my Lasdrop dripless started leaking after about 12 years, I called them and there are now rebuild kits available for most of them, the most important parts being the 2 new sets of setscrews. They told me to back off the stainless collar, use a very fine emory cloth on surfaces, maybe add some of that sof scrub we use topside with the grit in it, it helps polish the surfaces. Mark the shaft where the collar is b-4 you remove it. There are recomendations on how far to move it towards the bellows depending on the diameter of your prop shaft.With an older one you may need a slight bit more pressure , see what they recomend.My lasdrop gave me 10-12 years of maint free use I can't complain, although with my repower job, new shaft coupler prop, I am going back to a conventional stuffing box.......Red

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post #19 of 19 Old 01-19-2010 Thread Starter
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No need for a rebuild yet

Mine is only five years old this year, and shouldn't need a rebuild. It was part of a repower in 2005, and is part of a system that includes a flexible coupler. It works great.
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