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post #1 of 10 Old 10-08-2013 Thread Starter
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Stuffing box maintenance - interval

The stuffing box packing was replaced in 2010 and the boat has done 200 hours under power since then. If all seems fine (dripping at the normal rate, not getting hot) how often should the packing be replaced?

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post #2 of 10 Old 10-08-2013
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Re: Stuffing box maintenance - interval

Stuffing box packing is like a 5 - 10 year maintenance item as long as drip stays constant.

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post #3 of 10 Old 10-08-2013
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Re: Stuffing box maintenance - interval

I usually replace when I get close to running out of room or threads to tighten, sounds like you should be good for a couple more years at least.

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post #4 of 10 Old 10-17-2013
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Re: Stuffing box maintenance - interval

I replaced mine with a drip-less PSS seal. Best thing I ever did! It's been 12 years and no maintenance or drips. PSS Shaft Seal: The world?s leading dripless seal.

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post #5 of 10 Old 10-17-2013 Thread Starter
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Re: Stuffing box maintenance - interval

Hmmm, I know of 3 boats personally that have nearly sunk due to failure of dripless shaft seals. When they go, they really go.

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post #6 of 10 Old 10-17-2013
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Re: Stuffing box maintenance - interval

MarkSF,

Back around 1998 or so, I repacked my stuffing box with moldable packing...


I used 1/2 of the stuff for my 1 inch shaft. So far, I have not had to add any more. And by the way, my shaft does NOT have ANY DRIPPING. NO drip at any speed 0 to full RPM! AND, after running at high RPM for over 1/2 hour I can still reach down and hold my stuffing box with my bare hand.... no heat build up. I have also removed the shaft a couple of times for other maintenance and do not have any wear on it.

Just a data point.......

Greg
PS... We departed in 04 and did full time cruising (24/7) till late 08, now half time. Have a couple of thousand hours on the stuff.

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Nor'Sea 27, Guenevere
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post #7 of 10 Old 10-17-2013
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Re: Stuffing box maintenance - interval

On the PSS seal....

As with any rubber hose below waterline, the PSS bellows must be inspected on a regular basis for any sign of wear, aging or chemical deterioration. PYI suggests preventative maintenance. The PSS bellow should be replaced in six year intervals. During bellows replacement it is recommended the o-rings & set screws in the stainless steel rotor also be replaced.

Looks like there is maintenance that needs doing. And I am over due. Thanks MarkSF for the heads up.

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post #8 of 10 Old 10-19-2013
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Re: Stuffing box maintenance - interval

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Originally Posted by Delezynski View Post
MarkSF,

Back around 1998 or so, I repacked my stuffing box with moldable packing...


I used 1/2 of the stuff for my 1 inch shaft. So far, I have not had to add any more. And by the way, my shaft does NOT have ANY DRIPPING. NO drip at any speed 0 to full RPM! AND, after running at high RPM for over 1/2 hour I can still reach down and hold my stuffing box with my bare hand.... no heat build up. I have also removed the shaft a couple of times for other maintenance and do not have any wear on it.

Just a data point.......
Apologies for being off topic

Greg, one question for you - how easy is it to install the moldable packing? How often you had to adjust the nut until it was dripless?. The instructions call for a regular braided packing to be used as a retainer, wouldn't this be a problem?
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post #9 of 10 Old 10-19-2013
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Re: Stuffing box maintenance - interval

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Originally Posted by SVTatia View Post
Greg, one question for you - how easy is it to install the moldable packing? How often you had to adjust the nut until it was dripless?. The instructions call for a regular braided packing to be used as a retainer, wouldn't this be a problem?
I have a 1 inch shaft. When I was on the hard, I opened the packing gland and removed ALL old packing. I then put 1 round of 1/8 inch Teflon braided packing lubed well with the grease that comes in the kit. I then molded one stick of the moldable packing around the shaft, again lubed with the grease. I then put in one more wrap of of the Teflon braided packing. I snugged it all up. Once in the water, with the engine turning and Jill at the helm, I snugged it up until I had no more dripping. We then ran the engine up to speed and I checked it every few min to make sure I could still hold my hand on the packing and it did not over heat.

Once in and working, I checked it every so often to insure no drips. I did not have to make any further adjustments at all until I changed out my engine coupling. At that time, I loosened the gland up a bit, removed the shaft. When I put the shaft back in, I lubed it up where the packing was, tightened it and was good to go without replacing any of the packing. I am STILL using it with no leak and no problems.

I think it's VERY good bang for the buck!

Greg

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post #10 of 10 Old 10-20-2013
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Re: Stuffing box maintenance - interval

Thanks Greg, that will go up in my list. I just need more info on the "retainer" packing which I need to buy separately -- my shaft is 7/8 and the boat is "new" to me so I am not sure the size I need - more homework.
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