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01-26-2020, 11:37 AM
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#1
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Veteran Member
City: Palm Beach Gardens Fl
Country: Palm Beach
Vessel Name: Calypso
Vessel Model: Marine Trader 40'
Join Date: Aug 2012
Posts: 43
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New Stuffing Box Nuts?
Hello! We need to replace the stuffing box nuts on Calypso, a 1977 Marine Trader; See attached photos. Does anyone know if there is a particular thread and type of nut? Thank you!
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01-26-2020, 11:44 AM
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#2
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Enigma
City: Slicker?
Country: Bumpkin?
Join Date: Oct 2007
Posts: 13,640
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Greetings,
Mr. C. My best guess would be a metric nut of no special alloy although SS would be best. You can probably take a nut to Fastenal, for example and get a match up. I would suggest double nuts on reassembly, locking one against the other.
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RTF
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01-26-2020, 11:51 AM
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#3
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Veteran Member
City: Palm Beach Gardens Fl
Country: Palm Beach
Vessel Name: Calypso
Vessel Model: Marine Trader 40'
Join Date: Aug 2012
Posts: 43
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thanks! ...I tried the standard and it was not right. I'll try metric and let you know...
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01-26-2020, 11:54 AM
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#4
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TF Site Team
City: JAX, FL
Country: USA
Vessel Name: Hobo
Vessel Model: Krogen 42-120
Join Date: Nov 2008
Posts: 8,455
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Can you put a C-clamp on it and remove the nut and maybe the bolt. One side may hold it together at the dock while you get to a store right size also.
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01-26-2020, 12:16 PM
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#5
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Guru
City: Boston
Country: US
Vessel Name: Adelante
Vessel Model: IG 30
Join Date: Nov 2016
Posts: 768
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Measure diameter with ruler, preferably a 6" stainless one.
Measure thread with a thread gauge. (Metric & SAE)
Both available at Amazon or any auto parts store.
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01-26-2020, 12:20 PM
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#6
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Guru
City: Oconto, WI
Country: USA
Vessel Name: Best Alternative
Vessel Model: 36 Albin Aft Cabin
Join Date: Oct 2012
Posts: 770
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It could be the angle the camera was that but that bolt looks stressed, or bent. Better to replace both. If it is a stud and not a bolt, it should screw right out, if it is a bolt , a tap with a hammer should knock it loose.
I really would not worry about water intrusion, even if you remove both bolts at the same time, providing you don't forget to replace them and run the engine.
pete
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01-26-2020, 01:02 PM
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#7
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Guru
City: Fairport, NY and Palm Coast, FL
Country: United States
Join Date: Jan 2017
Posts: 1,852
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New Stuffing Box Nuts?
Is a new shaft on the list also?
Silicon bronze on the nuts.
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01-26-2020, 01:40 PM
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#8
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Guru
City: AICW
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 20,797
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Might be British Standard thread.
Mine was ordered from a guy in NY who imports MG car parts and only charged a few dollars shipping. Not at home so no contact info.
On mine an SAE would fit for about 3 turns then jamb.
All the long bolts and threaded rod on my Albin is this stuff as it was common over in Taiwan kn the 80s I have heard. Though I believe my rods are stainless.
If I had to redo ..I would just retap for SAE rod and nuts.
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01-26-2020, 11:27 PM
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#9
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Guru
Join Date: Oct 2011
Posts: 10,598
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Quote:
Originally Posted by Pete Meisinger
It could be the angle the camera was that but that bolt looks stressed, or bent. Better to replace both. If it is a stud and not a bolt, it should screw right out, if it is a bolt , a tap with a hammer should knock it loose. pete
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Looking at pic 1 the plate seems to have "a thread`s width" bend to it. Maybe it`s intended, maybe not.
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BruceK
Island Gypsy 36 Europa "Doriana"
Sydney Australia
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01-27-2020, 12:11 AM
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#10
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Guru
City: NARBONNE
Country: FRANCE
Vessel Name: 'Snow Mouse.'
Vessel Model: BROOM FLYBRIDGE 42.
Join Date: Apr 2014
Posts: 1,572
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Personally I'd change the whole stuffing box for a PSS seal. Once fitted just a periodic check, no marking on the shaft/greasing/tightening. I've had one now for about 8 years with the boat in constant use and no problems. I fitted mine while the boat was in the water but you need to be a calm and competent DIY'er.
Just my 2 pence worth.
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01-27-2020, 01:05 AM
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#11
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Guru
City: Miami Florida
Vessel Name: Possum
Vessel Model: Ellis 28
Join Date: Aug 2011
Posts: 4,501
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1/2”-13 just a guess. Let me know if I’m close.
What’s wrong with the existing nuts?
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Parks Masterson
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01-30-2020, 12:13 AM
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#12
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Veteran Member
City: Portland, OR
Country: USA
Vessel Name: Serendipity
Vessel Model: 1977 37' Puget Trawler
Join Date: Feb 2019
Posts: 72
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Should really be double nutted. As for thread, are there any original stuffing boxes left? The Fastenal suggestion is the best I've heard.
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01-30-2020, 09:46 AM
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#13
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Guru
City: Edgewater, MD
Country: USA
Vessel Name: Catalina Jack
Vessel Model: Defever 44
Join Date: Nov 2011
Posts: 1,253
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On my boat the stuffing box (1983) is original. Why double nut? Those nuts have lots of back pressure and won't back off. Even if both loosened there would not be a catastrophic leak.
Quote:
Originally Posted by WayneDana2
Should really be double nutted. As for thread, are there any original stuffing boxes left? The Fastenal suggestion is the best I've heard.
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01-30-2020, 10:50 AM
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#14
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Newbie
City: San Diego, CA
Country: USA
Join Date: Oct 2018
Posts: 3
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I recently replaced mine. They were BSW 1/2-12.
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01-30-2020, 12:14 PM
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#15
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Guru
City: Au Gres, MI
Country: US
Vessel Name: Never Say Never
Vessel Model: President 41 DC
Join Date: Jul 2015
Posts: 6,956
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Quote:
Originally Posted by catalinajack
On my boat the stuffing box (1983) is original. Why double nut? Those nuts have lots of back pressure and won't back off. Even if both loosened there would not be a catastrophic leak.
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My stuffing box looks like that and it has double nuts on it.
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Boat Nut:
If you are one there is no explanation necessary.
If you aren’t one, there is no explanation possible.
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01-30-2020, 01:10 PM
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#16
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Guru
City: AICW
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 20,797
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Quote:
Originally Posted by 525cj
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That's where I got mine...as someone before me was nice enough to provide the info when I had trouble identifying the correct nut size.
We will see how this plays out...hope the OP posts what his solution was.
As far as double nutting...a good idea but probably overrated in this situation. The packing probably acts somewhat like a locknut by providing back pressure for awhile...and even then as posted....any loosening is not a catastrophic issue.
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02-07-2020, 11:01 AM
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#17
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Veteran Member
City: Palm Beach Gardens Fl
Country: Palm Beach
Vessel Name: Calypso
Vessel Model: Marine Trader 40'
Join Date: Aug 2012
Posts: 43
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Thank-you everyone -it is a 1/2-12 inch standard. I also need to add 2-3 layers of flax. Does anyone know the correct size? It's a 77 Marine Trader 40DC
Diver Dave: You say it should be silicon bronze nuts and not Stainless?
THANK YOU!
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02-07-2020, 11:20 AM
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#18
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Guru
City: Fairport, NY and Palm Coast, FL
Country: United States
Join Date: Jan 2017
Posts: 1,852
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New Stuffing Box Nuts?
I won’t say imperative. But the entire assy is a bronze alloy. Putting steel in the mix is not necessary for strength or availability. SiBr does not suffer from crevice corrosion or galvanic corrosion when near copper and seawater.
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02-07-2020, 04:32 PM
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#19
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Guru
City: Miami Florida
Vessel Name: Possum
Vessel Model: Ellis 28
Join Date: Aug 2011
Posts: 4,501
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Damn, my guess of 1/2 -13 was pretty close!
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Parks Masterson
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02-07-2020, 04:41 PM
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#20
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Guru
City: AICW
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 20,797
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Quote:
Originally Posted by Caribe
Thank-you everyone -it is a 1/2-12 inch standard. I also need to add 2-3 layers of flax. Does anyone know the correct size? It's a 77 Marine Trader 40DC
Diver Dave: You say it should be silicon bronze nuts and not Stainless?
THANK YOU!
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Sounds like the British Standard thread, copied by others.
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