Shaft Seal Failure - What do you do? - Page 2 - SailNet Community
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post #11 of 25 Old 01-29-2009
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Quote:
Originally Posted by WinterRiver View Post
I know someone that had this happen to them.

She had just had the dripless seal system replaced, but something (a bolt??) was not done correctly. She motored for over a day before the seal blew, offshore, at night. Floorboards awash. Once she identified where the water was coming from, she was able to stem the flow to a manageable rate. It was a long night, particularly since they didn't want to tow her through the inlet at night. She often sails single-handed, but was lucky to have crew this time.

Yes, the problem may be rare, but not rare enough.
Sounds like a bad installation. My guess is they messed up using the rotor set screws, which are a one use item. If you tighten the stainless rotor down then decide to move it and make another adjustment you need to replace the set screws.

I use a 316 stainless steel split collar placed behind the stainless rotor as an added level of safety.

The split collar is sitting on top of the seal in this photo. I feel every PSS installation should have one.


These are PSS set screws. Tighten them down ONLY once. Once you do you dull the point and they should never be reused to bite the shaft again. There should also always be two set screws one on top of the other in the hole to lock the one in contact with the shaft from backing off. I have come across more than one PSS with only one set screw in each hole!!

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Last edited by Maine Sail; 01-29-2009 at 08:27 PM.
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post #12 of 25 Old 01-29-2009
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Quote:
Originally Posted by WinterRiver View Post
I know someone that had this happen to them.

She had just had the dripless seal system replaced, but something (a bolt??) was not done correctly. ....the seal blew, offshore, at night..
Yeah, case in point... a dripless seal doesn't have the packing rings to minimize clearance around the shaft... and the leak profusely if the pressure is reduced or lost on the collar....

Mainesail... that locking collar is a great idea.. is it a custom piece made in your own shop?

Ron

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post #13 of 25 Old 01-29-2009
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Originally Posted by Faster View Post

Mainesail... that locking collar is a great idea.. is it a custom piece made in your own shop?
I got it from McMaster Carr who else.. P/N 9633T19
McMaster Carr 316 Stainless Split collar For 1" Shaft

Of course McMaster will never let you know, on their web site, who makes the product until you get it in the mail. If you search the manufacturer you might find it for less than $33.00. It take pictures of everything cause my memory sucks..


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Last edited by Maine Sail; 01-29-2009 at 08:43 PM.
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post #14 of 25 Old 01-29-2009
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I think you've got it right, Maine. When I saw her that day she was pretty tired and we didn't get into the details. I just remember her saying that there was a problem with a bolt, or it could have been a screw.

Thanks for the detailed explanation.

Hylas 47
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post #15 of 25 Old 01-29-2009
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Maine Sail—

They do...it also comes in 2" widths and is used for sealing the mast-deck opening. I've also seen it in 4" widths...but can't find a link for it ATM.

Quote:
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Yeah I just wish they made it in wider widths.

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post #16 of 25 Old 01-29-2009
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Quote:
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Maine Sail—

They do...it also comes in 2" widths and is used for sealing the mast-deck opening. I've also seen it in 4" widths...but can't find a link for it ATM.
i've been looking for some 4" as i used to have a roll. the only stuff I found in 4"= widths was close to $80.00 per roll??? I still prefer the Thera-Band as it is latex rubber and once stretched it really sucks down onto and around whatever you are wrapping and it's wide enough too..

If you find reasonalble 4" wide stuff send me a link!!..

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post #17 of 25 Old 01-29-2009
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I have a dripless seal (with a hose connecting it to stern tube, and a hose is slightly oversize and clamped down - which does not make me all that happy).

I carry a toilet wax ring for this particular emergency - presumably if the hose is still in place, I may be able to stuff it (or parts of it) in the opening, then tape or otherwise clamp down.

If the hose blows - it may be more difficult (presumably would have to remove the old hose first, which may not be fun to do.

Prop shaft is certainly one of the more dangerous places on a boat - it's a thruhull that can never be closed and is under constant mechanical strain. Oh well.
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post #18 of 25 Old 01-29-2009
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I think this is the stuff your were thinking of. 4" x 10' Self Fusing
Rubbaweld

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post #19 of 25 Old 01-30-2009
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I do believe you've got it.
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I think this is the stuff your were thinking of. 4" x 10' Self Fusing
Rubbaweld

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post #20 of 25 Old 01-30-2009
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To add to Maine Sail's comments in post #11 above in regard to set screws:

You can use Loctite to secure the outer set screw. DO NOT under any circumstances use it on the inside set screw or it will glue the collar to the shaft and make disassembly difficult. The yard did that once on BR and it took them over 4 hours (on their nickel) to fix things.

Also, after the shaft seal is installed in the proper position I use a black permanent magic-marker to note the point where the aft end of rubber bellows joins the stern tube and the forward edge of SS seal ring is positioned on the shaft. A quick look at the shaft seal is part of my daily engine maintenance routine and with these marks I can quickly see if either the rubber bellows or the SS seal ring has moved.
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