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Go Back   SailNet Community > On Board > Gear & Maintenance > Stuffing Box Trouble
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Thread: Stuffing Box Trouble Reply to Thread
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Topic Review (Newest First)
06-22-2009 07:27 PM
blueoctober This last point is also a good one worth checking- don't ask
06-22-2009 06:57 PM
DrB
Way too Hot...

Quote:
The puzzling part is I am getting the drip and the hot temp...to give an idea of the temperature, think metal stove top when the oven is on. I will try your suggestions and see what happens. Thanks.
Check that they packing nut is square to the shaft and the shaft is centered in it. You may be "scraping" the shaft with the nut if the nut is not centered around the shaft.

DrB
06-22-2009 06:50 PM
doublec9 I may have tightened it down too much, but I simply tightened until the water stopped when I splashed this spring. The puzzling part is I am getting the drip and the hot temp...to give an idea of the temperature, think metal stove top when the oven is on. I will try your suggestions and see what happens. Thanks.
06-22-2009 10:14 AM
Northeaster I just have traditional flax, not Gore, but mine doesn't get hot at all. I could see if it were juts a bit warm.. but if it's hot, I would loosen it 1/4 turn or so, and try motoring for 20 minutes to see if there is a difference. It sounds like you have lots of water flow / dripping, so I am surprised it feels hot.
06-22-2009 09:11 AM
DrB
Is the shaft hot?

Can you feel the shaft and see if that is hot? That is a better indicator. With a helper, run the motor for a few minutes under load, i.e. shaft turning at mid range rpm. Put the motor in neutral to stop the shaft spinning and touch it near the packing nut. If it is "hot" then you are creating friction on the shaft. Whether or not it is causing scoring of the shaft can only be determined by pulling back the packing nut and looking at the shaft.

DrB
06-21-2009 09:40 PM
doublec9 Not sure if anyone is still following this, but I have a question for anyone who may be... I repacked my stuffing box this winter while on the hard (my first time) using WPT GTU Gore packing material. When running under power, the packing nut feels hot...not too hot to touch, but hot. Typically when under power, I get a 5-10 second drip. Should it feel cool to touch? I am assuming that if I can touch the packing nut, it is not going to be hot enough to damage the shaft.
04-21-2009 06:46 PM
nk235 Just to follow up with the outcome of this incase any body else looks this thread up for a similar problem in the future...Took the boat out last weekend and while my gf was at the helm I had my head stuck behind the engine by the stuffing box. I kept playing with the packing nut and re adjusting it...then taking it all the way off again, moving it around and then re-tightening it. Eventually it started to work! I started noticing small drips and moisture coming from between the shaft and the packing nut letting me know the shaft was getting the proper moisture. It still got a little warm as I only had about 3 drips per minute so next time down I am going to ease it off a little more till I get around 5-10 drips per minute and then monitor the temp by hand.

So I think it was just a matter of having the stuff setteling in plus me playing around with it till eventually I got it. One more little piece of maintenance I can say I now know how to do - largely in part by everyone on this forum and especially MainSail with his awesome pictorials. - You should really make that webpage into a book by the way!

Anyway thanks for the help
04-16-2009 06:49 AM
nk235
Quote:
Originally Posted by Maine Sail View Post
If it is leaking out of the big nut threads, the big not is not on far enough to compress the rings against the male end of the stuffing box. No drips can happen but is not normal when first installing packing. It should not seals out water completely after break in. Usually no leaks is due to an insertion problem, lack of thorough break in or a ring or two are cocked and not sitting square.

You don't say what kind of packing? GFO does not absorb much moisture and as such does not swell like other packings. It does however take quite a bit of time to break in. Traditional natural fiber flaxes will absorb water so they must not be overtightened at first.

Here's what I would suggest trying:

Tighten the big nut just until it stops leaking out the threads but do this without the lock nut tight and the once no drips at the threads of the big nut then tighten the lock nut..

Tightening the lock nut will stop this type of drip because it applies compressive pressure to the male/female threads, wher they mate, thus sealing them. Next run her in gear, preferably at the dock, monitoring temp for a number of hours (especially if GFO). If after a number of hours it still does not drip you'll need to repack because some of the packing is likely cocked and too tight agaist the nut and shaft. No amount of running will truly fixe cocked packing. Having cocked packing is essentially like going up one size..

Hope this helps..
Thank you. After thinking about it all this time I think you are right about perhaps not having the packing nut tight enough. I never really made it tight with my hand because I was afraid of over tightening it. I'll find out tomorrow and will def do what you suggested. Thanks again for this and also for the spot on your web page about changing it out. Thats where I learned to do it in the first place.
04-15-2009 11:42 PM
Maine Sail
If..

If it is leaking out of the big nut threads, the big not is not on far enough to compress the rings against the male end of the stuffing box. No drips can happen but is not normal when first installing packing. It should not seals out water completely after break in. Usually no leaks is due to an insertion problem, lack of thorough break in or a ring or two are cocked and not sitting square.

You don't say what kind of packing? GFO does not absorb much moisture and as such does not swell like other packings. It does however take quite a bit of time to break in. Traditional natural fiber flaxes will absorb water so they must not be overtightened at first.

Here's what I would suggest trying:

Tighten the big nut just until it stops leaking out the threads but do this without the lock nut tight and the once no drips at the threads of the big nut then tighten the lock nut..

Tightening the lock nut will stop this type of drip because it applies compressive pressure to the male/female threads, wher they mate, thus sealing them. Next run her in gear, preferably at the dock, monitoring temp for a number of hours (especially if GFO). If after a number of hours it still does not drip you'll need to repack because some of the packing is likely cocked and too tight agaist the nut and shaft. No amount of running will truly fixe cocked packing. Having cocked packing is essentially like going up one size..

Hope this helps..
04-15-2009 10:26 PM
johnferrell NOt trying to be a smart a$$ but are you sre you have the lock nut and the compression nut correct? The lock nut is the one on the shaft side. Again not trying to be a smart elic. Just curious???/
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