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  #11  
Old 05-08-2013
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Re: Hot stuffing box...

Do you have a photo of your stuffing box? 12 strands of 1/4" means your packing nut must be at least 3" deep, without the threads that are engaged.
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  #12  
Old 05-08-2013
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Re: Hot stuffing box...

Quote:
Originally Posted by msmith10 View Post
Do you have a photo of your stuffing box? 12 strands of 1/4" means your packing nut must be at least 3" deep, without the threads that are engaged.
No photo handy but I'll take one. I don't think the nut is sticking out quite three inches from memory, but there are quite a few threads...

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Old 05-08-2013
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Re: Hot stuffing box...

Both me and the yard I use prefer flax, however it's tight enough that it drips 2-3 drops per minute running and almost nothing when stopped. If you can wrap your hand around the nut and hold it there comfortably it's warm, otherwise too hot.
12 wraps of 1/4 each makes 3 inches of packing ? Even high speed packing glands aren't that thick. Any chance there's a piece missing ? Maybe a packing seat that used to go on the stainless threads ?
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Old 05-09-2013
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Re: Hot stuffing box...

I concur with Capttb; something missing from the bottom of the stuffing box.

I'm surprised that graphite packing would be used on a boat. Graphite, which is very low in the galvanic series, will corrode metals higher in the galvanic series.
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Re: Hot stuffing box...

I believe it's graphite-impregnated gortex, not pure graphite. The stuff really is an improvement over the old flax stuffing. It lasts for years before it needs to be changed and you get it to run dripless without heating the stuffing box.
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Old 05-10-2013
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Re: Hot stuffing box...

Suggestion: an IR temperature gun would be a great way to quantify the temperature. For 30-40$ they are great to have around (find drafts in the house, cooking, engine temp etc).
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Old 05-10-2013
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Re: Hot stuffing box...

Quote:
Originally Posted by asdf38 View Post
Suggestion: an IR temperature gun would be a great way to quantify the temperature. For 30-40$ they are great to have around (find drafts in the house, cooking, engine temp etc).
Will do.

Anyone know the temp range I should be in??

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Old 05-11-2013
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Re: Hot stuffing box...

Tried to loosen the nut today and COULD NOT get the lock nut off. Then I thought that the mechanic adjusted it while it was hot. Metal contracts.....

It wasn't hard to get it hot again running it at the dock. 15 min or so at 1000rpm (500 @ the shaft) and it was warm. 5 more minutes when I checked it again and it was HOT.

I finally got the nut off after nearly blowing out a bicep (mechanic used a longer wrench than I had). I removed a ring of flax that was black and steaming. That can't be good....

Even with a ring taken out, the nut completely off and the wax being hot (and lots of it in a pile under the box) very little water is dripping. So if it won't drip much with the nut off, how's it supposed to drip enough while underway?

I put it back on with lots of slack in the nut hoping that the packing might expand a little and let more water through. I foresee motoring very very slowly this weekend...

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Re: Hot stuffing box...

Med, there is something strange with that stuffing box for sure. Can't you call the people back to re-do it or explain what they did exactly? Ideally, you'd want to take the thing apart and get to the bottom of this. It just doesn't make sense that it uses 12 rings of packing. Hopefully it's something as simple as removing most of the extra rings of stuffing to get to the normal 3 rings. A photo would help...
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Old 05-13-2013
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Re: Hot stuffing box...

Med,
As others have said, somthing does not seem right. Seems like someone modified that stuffing box and replaced a hose with the stainless pipe. There is a lot of friction int 12 rows of packing. I would bite the bullet and installed a new stuffing box and hose. A good quality like somthing from Buck Algonguin:
Buck Algonquin packing boxes

http://www.deepblueyachtsupply.com/d...plete-assembly

Fairly inexpensive (except for hull out), but you should be good to go after the install.
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