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Go Back   SailNet Community > On Board > Gear & Maintenance > Hot stuffing box...
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Thread: Hot stuffing box... Reply to Thread
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Topic Review (Newest First)
05-16-2013 08:58 PM
casey1999
Re: Hot stuffing box...

Quote:
Originally Posted by MedSailor View Post
Unfortunately not. The box you reference attaches to a hose at the aft end (like 99% of them in the world) but I don't have a hose at the aft end. Instead I have a threaded stainless steel tube that mates directly to the box.

The tube "could" be cut, a hose fitted, and then I could have any box I want. That's actually what I asked for, but didn't get due to "access issues".

MedSailor
That is what I was thinking, cut the tube, but the yard says not enough room- I assume they cannot get a grinder in there to do the work. Maybe another cut off tool would fit- maybe a dremel with a lot of cut-off wheels and a couple hours labor. Not sure if you have the length between the stainless pipe and the engine coupling.

Or what about just fitting the old school box at the end of the stainless pipe? You could cut the hose some and that would reduce the length- the traditional stuff boxes are pretty short and no reason to have a long hose on it- just a short length to mate up will work.
05-16-2013 08:49 PM
ashmun
Re: Hot stuffing box...

I concur with the previous post that 12 wraps seems a bit high for a traditional stuffing box. And I also concur with using old fashion flax that wonít burn your shaft like old PTFE/Teflon. I prefer traditional stuffing boxes over the dripless - I can handle a few drops vs the risk of a complete failure of a dripless.

Generally, if a stuffing box is cranked too tight, it will get too hot. But a stuffing box cranked tight will not leak 2-3 drops a second. So letís step back and confirm that the shaft is aligned with the engine because if itís not, it could also cause the stuffing box to get hot. Why did they replace the shaft and how many burn marks were on the shaft (e.g. at the stuffing box, at the cutlass bearing, etc.)?

Julia
s/v Esprit
Mariner 39
05-16-2013 04:42 PM
MedSailor
Re: Hot stuffing box...

Quote:
Originally Posted by casey1999 View Post
Would one of these old school stuffing boxes work?
Packing Boxes for sale. Buy your Packing Boxes today and save.
That way you got a new unit that would replace your modified one. The new ones would only take 3 rings of packing.
Unfortunately not. The box you reference attaches to a hose at the aft end (like 99% of them in the world) but I don't have a hose at the aft end. Instead I have a threaded stainless steel tube that mates directly to the box.

The tube "could" be cut, a hose fitted, and then I could have any box I want. That's actually what I asked for, but didn't get due to "access issues".

MedSailor
05-16-2013 03:32 PM
casey1999
Re: Hot stuffing box...

Quote:
Originally Posted by MedSailor View Post
Great advice, only problem is that's exactly what I told them to do. And last week WAS haulout time. I was tired of messing about with my current stuffing box and told them to install a dripless unit, which they agreed to do after looking everything over.

Imagine my surprise when I got to the boat and saw that the old box had been put back together. They told me that instead of a rubber tube behind by box, it was a stainless steel tube that was directly threaded on to the aft end of the box. The told me the access to the area was no good and thus they put the old one back together.

Not what I asked them to do, not what we agreed on, but the haulout had already gotten really expensive so I didn't mind them not tacking on a million more hours of labor. Now I'm not so sure....

So yeah, I tried asking them to replace it and they didn't. All the more reason why I feel they own any problems associated with my current predicament.

MedSailor
Would one of these old school stuffing boxes work?
http://www.deepblueyachtsupply.com/d...plete-assembly
That way you got a new unit that would replace your modified one. The new ones would only take 3 rings of packing.
05-16-2013 12:20 AM
MedSailor
Re: Hot stuffing box...

Quote:
Originally Posted by casey1999 View Post
Med,
When it come time to hull out, I would try to just install a new box. What happens if the bushing rubs your shaft and wears a goove, or pieces or metal fragments start to breakin off.? Just seems to be a jury rig to try to correct a poorly engineered stuffing box. But it is good they are working with you on this.
Good Luck
Great advice, only problem is that's exactly what I told them to do. And last week WAS haulout time. I was tired of messing about with my current stuffing box and told them to install a dripless unit, which they agreed to do after looking everything over.

Imagine my surprise when I got to the boat and saw that the old box had been put back together. They told me that instead of a rubber tube behind by box, it was a stainless steel tube that was directly threaded on to the aft end of the box. The told me the access to the area was no good and thus they put the old one back together.

Not what I asked them to do, not what we agreed on, but the haulout had already gotten really expensive so I didn't mind them not tacking on a million more hours of labor. Now I'm not so sure....

So yeah, I tried asking them to replace it and they didn't. All the more reason why I feel they own any problems associated with my current predicament.

MedSailor
05-15-2013 01:57 PM
casey1999
Re: Hot stuffing box...

Med,
When it come time to hull out, I would try to just install a new box. What happens if the bushing rubs your shaft and wears a goove, or pieces or metal fragments start to breakin off.? Just seems to be a jury rig to try to correct a poorly engineered stuffing box. But it is good they are working with you on this.
Good Luck
05-15-2013 11:47 AM
jimgo
Re: Hot stuffing box...

Why does the bushing require a haul-out? Can't they disconnect something else and do it without having to completely remove the prop shaft? Maybe I'm just not envisioning the shaft and packing gland properly.
05-15-2013 04:27 AM
Ajay73
Re: Hot stuffing box...

Med, I'm happy to hear that they are considering alternatives. When I talked to the mechanic about my overheating problem he just gave me the "I've been doing this for forty years" talk and just didn't want to think that he could be wrong about this.
05-15-2013 12:35 AM
MedSailor
Re: Hot stuffing box...

Update:

First, sorry for not taking pictures of the stuffing box this weekend. I was too busy taking pictures of our baby and my lovely wife out on this windy blustery weekend on the boat. I assure you the stuffing box pretty normal looking from the front end.

I discussed the issue with the yard yesterday after running it for 2 days at half throttle and the box temp was 120F. He hemmed and hawed and kept repeating the problem that there are just a lot of rings in there (12) which makes that much more friction and that much less water movement. He decided to talk with his shaft expert and call me back today, which he did.

The shaft expert guy had seen boxes like mine and apparently they weren't made for many years because they would get hot and cause problems. Turns out 12 rings is not better than 3. He said the best solution was to put some kind of spacer/bushing in the back to take up the extra space and then put in 3-4 rings of stuff. That requires a haul-out and pulling the shaft and since the yard JUST PUT ME IN THE WATER they aren't super keen on doing that again right now.

The suggested interim fix is to use a teflon impregnated kevlar stuffing matereal + teflon grease and that will allow me to run cool. He suggested taking 4 rings of flax packing out from the original 12 and replacing them with kevlar but I suggested that since I took out 2 rings this weekend and replaced them with nothing and still run at 120F at 1/2 throttle that they should take out quite a few more. In "theory" the aft most stuffing rings will be in contact with the most water and stay cool.

We'll see if this works. I am happy that they've started consulting other experts when they can't seem to answer the question and that they're willing to come to my slip and make it right quickly. Hopefully this will work and next haulout I can get some of those bushing things put in there and forevermore only have 3-4 rings of packing like the rest of the world.

Anyone ever heard of kevlar stuffing box packing? That's a new one by me...

MedSailor
05-14-2013 08:28 PM
Ajay73
Re: Hot stuffing box...

Med I had the same problem of a hot stuffing box on my Catalina 27. The spec on my boat (one inch shaft) is 3/16" packing. The mechanic I had do the work put in 1/4" packing. I didn't think much about the stuffing box but touched it once for some reason and it was too hot to keep my hand on it. I told the mech on it and he didn't have an answer, like he didn't know what to say. I told him about the 3/16 spec and his answer was that it squeezes down and is therefore no problem. I bought an IR thermometer and the reading was 145F. I asked around and people said their's runs just body temp warm. I eventually had the boat hauled and put in the 3/16", three rings. The temp dropped immediately to about 98F. I think you have too much packing in there. Get the right diameter and use about three rings and that should be good.

Here's a link to the discussion I had on this on the Catalina Owners forum.

http://forums.catalina.sailboatowner...ghlight=ajay73
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