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Go Back   SailNet Community > On Board > Gear & Maintenance > Stuffing box leaks
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Thread: Stuffing box leaks Reply to Thread
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Topic Review (Newest First)
06-30-2008 02:18 PM
beej67
Quote:
You can try to tighten the packing nut a little to see if that stops or slows the leak.
This is the first thing to do. Do that, come back, let us know whether it worked. Sometimes a quarter turn is plenty to stop a stuffing box leak.
06-29-2008 09:21 PM
rmkddmau I own an inboard version of the S2 7.9, and just installed the PSS dripless shaft seal. I had way too much leaking last year, and tightening the packing no longer slowed it down. It was not extremely difficult, except for the tight access, and it works great. I am finally dry as a bone. Obviously the boat has to be out of the water to replace it. I pulled the old brass stuffing box to get the dimension on the stub that the new unit attaches to. Cost of the part for the 1 3/4" x 3/4" (shaft) was less than $300, but well worth it.
06-28-2008 10:46 PM
rocinante33 As stated previously, you can do this in the water. Not that much water comes in. Go for it!
06-28-2008 01:42 PM
SEMIJim I'm informed it's possible to replace the packing gland material in the water. One method I read about is to tightly tie a cut-open bicycle inner tube around the end the water would come in when you take the nut loose. Another is to place some rolled-out silly putty in a sandwich bag and stuff it in there. One of my club mates told me not that much water would come in while you were doing it, anyway, so if you've got the nerve, just let it flow .

Obviously you'll want your new packing material rings cut in advance and you'll want to make sure you'll have on-hand all the tools you'll likely need, incl. a good selection of picks with which to get the old material out. I only needed a right-angle pick I picked up at a local tool store, but I had a whole selection on-hand, incl. a set of dental-tool-like picks, just to be sure. (I did mine while the boat was on the hard--prior to spring launch.)

Jim
06-28-2008 01:36 PM
Moonfish My boat came with the Norscot dripless shaft seal. This is my third boat, and if/when I buy another, if it doesn't have this wonderful little independent system I'll install it. I check the fluid level (ATF) every few months, and that's it. In the year I've owned the boat, I've topped off the fluid once. Love it.

EDIT: The shaft link above that is automatically generated by the SailNet store is not the same seal system. I don't have experience with the PSS system. I searched Norscot on the store site, but the results were zero.
06-28-2008 01:23 PM
CalebD If you try to rely on your automatic bilge pump to take care of this problem until you haul out you risk the possibility of allowing your batteries to get overwhelmed. The repercussions of this are having a flooded or sunk boat. Don't ask how I know this... fortunately my boat only flooded requiring a new battery and several engine oil changes to get the water out of there. You could probably do the re-packing on a quick haul out in 1/2 hour and save yourself some potential grief.
06-28-2008 11:11 AM
gcleo Thanks to everyone for your help. I have owned the boat for five years. The shaft does turn when under sail, and always has. I typically put it in reverse to stop it. The leak when under power is much more than a drip--it's a steady stream. I am more than willing to undertake the repair myself, and will check the tightness of the bolts. My main concern is whether I could wait till end of season to haulout and repair properly or if this is a type of problem that could significantly worsen within a few months.
06-28-2008 01:03 AM
SEMIJim
Quote:
Originally Posted by sailingdog View Post
Just curious, is this boat new to you or have you owned it a while? If the boat is new to you, I would HIGHLY RECOMMEND that you re-pack the stuffing box after inspecting the prop shaft for wear, scoring and other issues.
Well, he's had it at least two years (see previous comments from him), so the boat's not really "new to him" anymore. I'd say if he's not yet re-packed the stuffing box since he's owned the boat, so he really doesn't know what condition its condition is in, he should do that, anyway.

Jim
06-28-2008 12:56 AM
CalebD If you are as clueless as I was when my old boat was new to me everything sounded as though I should bring in the experts. I did not know what a stuffing box was until we got our Tartan 27. Heck, I did not even know that the engine had a raw water impeller but I found out about both things the hard way. Do not worry so much about this stuffing box issue as it is an easy fix where some are not. With resource links like the ones above you just need to learn by doing it yourself and save yourself a bunch of money and learn about your own boat and it's systems in the process.
06-28-2008 12:28 AM
sailingdog If the stuffing box is causing enough resistance to stop the prop spinning... you've got a serious problem.

Just curious, is this boat new to you or have you owned it a while? If the boat is new to you, I would HIGHLY RECOMMEND that you re-pack the stuffing box after inspecting the prop shaft for wear, scoring and other issues.

Quote:
Originally Posted by rperret View Post
SD

is there a correlation between tightness of stuffing box and whether the shaft spins when under sail (if tranny is in neutral).

strane thing happened during wed nite race before start - shut engine down - put gear in neutral - and was under main doing about 4.5kts under sail when all of a sudden the bloody shaft starts turning (note I have a martec folding prop). i placed it in gear in reverse and it stopped turning.

in the past 2 years this has never happened...
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