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Author Topic: Odd Stuffing Box Line Placement  (Read 393 times)

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TortolaTim

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Odd Stuffing Box Line Placement
« on: October 15, 2019, 04:25:37 PM »

Ok guys, I'm working down my winterization list and got to the replacement of the heat exchanger zinc. I had a hard time finding it, then realized that the dripless stuffing box hose is attached where the zinc should be.  Has anyone ever seen this done before? My research online shows that that hose is normally just routed straight up above the waterline and into space so I'm a bit confused. I'm guessing that the zinc has been removed to facilitate this setup. The stuffing box itself is pretty new according to the broker listing when I bought the boat, but I don't have any of the paperwork for it, so I don't know what brand it is. I'm going back to the marina tomorrow, so I'm going to take a closer look at it and get some pics if I can. I just wanted to throw this out there to you guys before I make the drive tomorrow.
Thanks again!
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Tim Callico
1989 C34 #957
M25XP
St Clair Shores, MI

KWKloeber

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Re: Odd Stuffing Box Line Placement
« Reply #1 on: October 15, 2019, 09:07:14 PM »

Tim

On sailboat you don't need to plumb a water supply to the dripless seal.  On a powerboat the dripless needs to be watered, otherwise it can burn up.  Or if a sailboat has a bearing in the shaft log then it too needs to have water supplied to the dripless.

Typically just a vent line is run on certerline to above the waterline as you describe.

There's no harm watering the dripless but not necessary (belt and suspenders?) but the Hx anode should remain in place -- so it's better to tee off a seawater hose rather than watering it via from the anode port.

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Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
So throw off the bowlines.  Sail away from the safe harbor.  Catch the tradewinds in your sails.
Explore.  Dream.  Discover.   -Mark Twain

TortolaTim

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Re: Odd Stuffing Box Line Placement
« Reply #2 on: October 16, 2019, 05:25:43 AM »

Thanks, Ken. That's kind of what I was thinking too. I'm going to see if I can figure out the exact model today at the boat and find some tech data on it, but I agree about the zinc being replaced. Additional question...since this thing has water in it, what about winterization requirements? I haven't seen anyone mention anything about it. I'm in the Detroit area, and it gets pretty cold here mid-winter, so I don't want anything to burst.
Thanks, again
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Tim Callico
1989 C34 #957
M25XP
St Clair Shores, MI

Ron Hill

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Re: Odd Stuffing Box Line Placement
« Reply #3 on: October 16, 2019, 02:48:57 PM »

Tim : I'll guess that the PO plumbed it like that because you are in fresh water!!!
You might think about using a fresh water anode in the HX and plumbing the packing gland seperatly as mentioned by Ken.

A few thoughts  :think
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TortolaTim

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Re: Odd Stuffing Box Line Placement
« Reply #4 on: October 16, 2019, 05:59:10 PM »

Ron, yep I did today what you advised. I removed the line from the HX and installed an anode, then re-plumbed the line from the stuffing box to the raw water circuit.
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Tim Callico
1989 C34 #957
M25XP
St Clair Shores, MI

Noah

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Re: Odd Stuffing Box Line Placement
« Reply #5 on: October 16, 2019, 06:36:42 PM »

What do you mean ď re-plumbed into raw water circuitĒ? I recommend you read Mainsailís posts/site regarding terminating dripless lineóit should provide some helpful tips. Caveat: I have a traditional stuffing box.
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TortolaTim

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Re: Odd Stuffing Box Line Placement
« Reply #6 on: October 16, 2019, 06:47:24 PM »

I did read it, thanks. I also got this from the latest edition of Calder's book. "In order to keep the seal lubricated, provision is made to maintain a water supply from the engine's raw-water circuit." The mechanic who installed the new stuffing box did this, but used the hole for the anode in the HX for the water supply, thereby eliminating the anode. I moved the hose from the HX to another hose on the RW circuit so I could put the anode back in. I did also read PYI's instructions for the seal and it does say that low speed vessels (like ours) are ok just to vent the line above the waterline, vis a vis mainesail's post. Faster boats need to be plumbed the way I have done it. The mechanic who installed the unit had a water supply attached, that's why I decided to keep it that way.
« Last Edit: October 16, 2019, 07:04:24 PM by TortolaTim »
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Tim Callico
1989 C34 #957
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St Clair Shores, MI

Craig Illman

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Re: Odd Stuffing Box Line Placement
« Reply #7 on: October 17, 2019, 06:19:21 AM »

A PO had plumbed the stuffing box line to a raw water line, but it was below the water line of the boat on my C30. When you serviced the raw water pump or the HX it siphoned into the bilge and you couldn't stop it. I think it's a sinking hazard. I rerouted to one of the vent devices recommended in the Mainesail article. It was only $8?

Craig
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KWKloeber

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Re: Odd Stuffing Box Line Placement
« Reply #8 on: October 17, 2019, 07:49:49 PM »

Tim

I don't have a dripless and don't winterize using antifreeze so I probably shouldn't speak to that.

An unsolicited comment on the install - if that's yellow brass tee, barbs - note that yellow brass isn't approved for raw water use.  Tho, being on freshwater would be a mitigating factor.  Red brass is "ok", bronze or maerlon (or marleon-like) would be best. 
And all below-waterline, or potentially siphoning raw water, hoses should be double-clamped (best is to use ABA or AWAB type clamps.)

-k
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Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
So throw off the bowlines.  Sail away from the safe harbor.  Catch the tradewinds in your sails.
Explore.  Dream.  Discover.   -Mark Twain

TortolaTim

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Re: Odd Stuffing Box Line Placement
« Reply #9 on: October 19, 2019, 09:49:20 AM »

Craig, itís above the waterline, I checked it again yesterday. 👍

Ken, agree about the bronze. Iíve looked all over for suitable marelon or brass T-fittings. I canít find them anywhere.  I have a PVC ďTĒ attached to one of my thru hulls, and Iím really wanting to shore it up with the proper materials after reading mainesailís blog about thru-hulls. It is the shower drain T-eed with the head intake raw water line. Any ideas where to source the appropriate T fitting for this? It would also be the appropriate part for the stuffing box line above.

Thanks again to everyone for all the great suggestions
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Tim Callico
1989 C34 #957
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St Clair Shores, MI

KWKloeber

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Re: Odd Stuffing Box Line Placement
« Reply #10 on: October 20, 2019, 10:02:59 AM »

Tim

Your burb setup is 5/8" x 5/8" x ?
The head supply tee you need is what size hoses and threads onto what size?
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Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
So throw off the bowlines.  Sail away from the safe harbor.  Catch the tradewinds in your sails.
Explore.  Dream.  Discover.   -Mark Twain

TortolaTim

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Re: Odd Stuffing Box Line Placement
« Reply #11 on: October 21, 2019, 04:37:16 PM »

Ken, looks like for the stuffing box, 5/8,5/8 and 3/8.  The head thru hull T has 5/8 ID hose barbs , but I can't tell what thread sizes they are. I'm hauling out tomorrow, so I'll disassemble it on the hardstand and figure out what I need.
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Tim Callico
1989 C34 #957
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St Clair Shores, MI

KWKloeber

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Re: Odd Stuffing Box Line Placement
« Reply #12 on: October 23, 2019, 07:24:41 PM »

Tim

And the thread size the T screws onto?  This screws (with a nipple) onto a forespar valve?
Like this?

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Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
So throw off the bowlines.  Sail away from the safe harbor.  Catch the tradewinds in your sails.
Explore.  Dream.  Discover.   -Mark Twain

TortolaTim

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Re: Odd Stuffing Box Line Placement
« Reply #13 on: October 24, 2019, 10:52:48 AM »

I'll have to take it apart and measure it. I'm going to try to get out there on Sat, but here are some pics of the setup
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Tim Callico
1989 C34 #957
M25XP
St Clair Shores, MI
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