Reply
 
Thread Tools Search this Thread Display Modes
 
Old 01-27-2017, 05:27 PM   #1
Senior Member
 
Gabe n Em's Avatar
 
City: Savannah, GA
Country: USA
Vessel Name: In Sanity
Vessel Model: 1981 Mainship 40'
Join Date: Jan 2015
Posts: 382
Free hand-me-down sea cocks and through hulls

Kidding! !

We replaced the through hulls last week on our 36 year old boat. Ever think about what's going on down there? Scary! !
Attached Thumbnails
Click image for larger version

Name:	20170126_070459.jpg
Views:	248
Size:	166.0 KB
ID:	61047   Click image for larger version

Name:	20170125_180721.jpg
Views:	206
Size:	105.0 KB
ID:	61048   Click image for larger version

Name:	20170125_200406.jpg
Views:	258
Size:	55.0 KB
ID:	61049  
__________________
Advertisement

Gabe n Em is offline   Reply With Quote
Old 01-27-2017, 06:56 PM   #2
Guru
 
HopCar's Avatar


 
City: Miami Florida
Vessel Name: Possum
Vessel Model: Ellis 28
Join Date: Aug 2011
Posts: 3,944
Nice job on the new installation.
I'm surprised to see those old Groco rubber plug seacocks lasted this long. Did they start to leak?
__________________

__________________
Parks Masterson
www.hopkins-carter.com
HopCar is online now   Reply With Quote
Old 01-27-2017, 09:11 PM   #3
Hospitality Officer
 
Andy G's Avatar
 
City: Pittwater
Country: Australia
Vessel Name: Sarawana
Vessel Model: IG 36 Quad Cabin
Join Date: Sep 2010
Posts: 1,623
Just about to embark on replacing all eight seacocks in Sarawana, decided to go with a composite NZ product.

Two of the seacocks for the toilets have built in cupboards around them , so the Tecma's will have to come out and a bit of carpentry undertaken with the mighty Fein (bit worried about the carpenter though, he can be a bit dodgy at times)
Andy G is offline   Reply With Quote
Old 01-28-2017, 09:25 PM   #4
Guru
 
C lectric's Avatar
 
City: B.C.
Country: Canada
Vessel Name: Island Pride
Vessel Model: Palmer sedan 32'
Join Date: Oct 2007
Posts: 2,181
Sure you will do just Fein.
C lectric is offline   Reply With Quote
Old 01-28-2017, 10:24 PM   #5
GFC
Guru
 
GFC's Avatar
 
City: Tri Cities, WA
Country: USA
Vessel Name: Beachcomber
Vessel Model: Sea Ray 550 Sedan Bridge
Join Date: Nov 2012
Posts: 3,099
I was thinking of asking for that seacock that's at the 9:00 position in the picture, sort of along the left side about midway between top and bottom of the photo.


It would be kind of a funny rod holder for a stern mounted flag.


But it would probably just end up in my garage along with all the other junk I've collected over the years.
__________________
Mike and Tina
Beachcomber 1995 Sea Ray 550 Sedan Bridge
GFC is offline   Reply With Quote
Old 01-29-2017, 05:33 AM   #6
Guru
 
City: Seaford Va on Poquoson River, VA
Country: United States
Vessel Name: Old Glory
Vessel Model: 1970 Egg Harbor 37 extended salon model
Join Date: Jan 2016
Posts: 1,775
old Groco rubber plug seacocks last a very long time.
I have two. a 3/4 and 1.25 inch. They can be taken apart and cleaned and greased.
Mine are from 1970 and still fine, not rotten, metal still solid.
I don't have yellow rubber handle covers, just bronze rod.
Perhaps you should sell or give them to someone?
sdowney717 is offline   Reply With Quote
Old 01-29-2017, 07:12 AM   #7
Senior Member
 
Gabe n Em's Avatar
 
City: Savannah, GA
Country: USA
Vessel Name: In Sanity
Vessel Model: 1981 Mainship 40'
Join Date: Jan 2015
Posts: 382
I think a big cause of death for these, and the reason we had planned to pull them all indiscriminately, was the wet wood backing blocks. The ac through hull would wiggle when opened or closed! The rubber plugs were chewed on the inside and the face seal leaked when exercised.
Gabe n Em is offline   Reply With Quote
Old 01-29-2017, 08:34 AM   #8
Guru
 
angus99's Avatar
 
City: Signal Mtn., TN
Country: US
Vessel Name: Stella Maris
Vessel Model: Defever 44
Join Date: Feb 2012
Posts: 1,742
Quote:
Originally Posted by Gabe n Em View Post
I think a big cause of death for these, and the reason we had planned to pull them all indiscriminately, was the wet wood backing blocks. The ac through hull would wiggle when opened or closed! The rubber plugs were chewed on the inside and the face seal leaked when exercised.
Nice job!

Largely the same experience here. I replaced about a dozen of these seacocks below the waterline, although only one of them was stiff . . . and the dimple on the rubber plug that inhibits movement can be sanded out. The old rubber-plug Grocos are extremely robust, but over time, the bond to the hull weakened and became overly dependent on the through hull connection. The "backing boards" were plywood affixed with some kind of weak black mastic; some were saturated and would flex when operated. I could pull the whole assembly off by hand once the through hull was sawed off.

I went with new Groco ball-valves because I like their stronger composite backing boards and the ability . . . if you use their threaded flanges . . . to swap out a damaged or defective seacock without involving the through hull. The new flanges are glassed to the hull and use the proper threads to deeply engage the through hull. They're rock solid. (And yes, the mud daubers' nest is long gone )
Attached Thumbnails
Click image for larger version

Name:	IMG_0896.jpg
Views:	102
Size:	107.5 KB
ID:	61093  
angus99 is offline   Reply With Quote
Old 01-29-2017, 11:30 AM   #9
Guru
 
City: Seaford Va on Poquoson River, VA
Country: United States
Vessel Name: Old Glory
Vessel Model: 1970 Egg Harbor 37 extended salon model
Join Date: Jan 2016
Posts: 1,775
Quote:
Originally Posted by Gabe n Em View Post
I think a big cause of death for these, and the reason we had planned to pull them all indiscriminately, was the wet wood backing blocks. The ac through hull would wiggle when opened or closed! The rubber plugs were chewed on the inside and the face seal leaked when exercised.
Yes, they can get scored, the other side, you tighten the handle, the rubber squeezes and seals the valve. Just the nature of them and how they work that they might leak a little. Mine don't leak when I loosen the handle and turn the valve. I am impressed with how they keep working being as old as they are, so a good design. I suppose if people never take them apart to clean the inside where the rubber rubs, using them a lot can scratch the rubber, if they are corroded on the inside.

I have not greased them recently, but I also mostly leave them open all the time.
I think a marine water resistant grease would be ok.

The two I have are on the head intake and the head outlet.
sdowney717 is offline   Reply With Quote
Old 02-06-2017, 12:23 PM   #10
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 17,827
"but over time, the bond to the hull weakened and became overly dependent on the through hull connection.'


A proper seacock install will have them bolted ,3/8 bronze bolts minimum thru the hull.

The rubber items last almost forever IF you always remember to loosen the T handle before moving the operating lever.
FF is offline   Reply With Quote
Old 02-07-2017, 06:47 AM   #11
Guru
 
City: Seaford Va on Poquoson River, VA
Country: United States
Vessel Name: Old Glory
Vessel Model: 1970 Egg Harbor 37 extended salon model
Join Date: Jan 2016
Posts: 1,775
Quote:
Originally Posted by FF View Post
"but over time, the bond to the hull weakened and became overly dependent on the through hull connection.'


A proper seacock install will have them bolted ,3/8 bronze bolts minimum thru the hull.

The rubber items last almost forever IF you always remember to loosen the T handle before moving the operating lever.
The 2 rubber ones I have are original to boat from 1970. Still in good shape.

You could probably resurface badly scored rubber with either Loctite s30 (even mixed with 1/32 fiberglass fibers which toughens the surface) , or some 3M5200
sdowney717 is offline   Reply With Quote
Old 02-15-2017, 05:59 AM   #12
Hospitality Officer
 
Andy G's Avatar
 
City: Pittwater
Country: Australia
Vessel Name: Sarawana
Vessel Model: IG 36 Quad Cabin
Join Date: Sep 2010
Posts: 1,623
Quote:
Originally Posted by Andy G View Post
Just about to embark on replacing all eight seacocks in Sarawana, decided to go with a composite NZ product.

Two of the seacocks for the toilets have built in cupboards around them , so the Tecma's will have to come out and a bit of carpentry undertaken with the mighty Fein (bit worried about the carpenter though, he can be a bit dodgy at times)


One month later.

Well, after cutting out the access panels to the aft head, I got a close first hand look at the copper deck drain pipe attached to the below waterline thru hull fitting situated snug up against the hull.

Guess what, it had a slow leak, the pipe was virtually corroded away to nothing, one small tap and the slow leak became a large leak prompting some emergency plumbing, as the fractured pipe was about an inch or so below waterline. Why place a thru hull fitting below water line when there is absolutely no necessity to do so?

I am now cutting out access(viewing) panels for all thru hull fittings on the boat.
Andy G is offline   Reply With Quote
Old 02-15-2017, 06:14 AM   #13
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 17,827
"Why place a thru hull fitting below water line when there is absolutely no necessity to do so? "

Deck wash and rain water is dirty , some folks prefer a no streak topside.

Not the way I would build the boat , but....
FF is offline   Reply With Quote
Old 03-06-2017, 07:24 AM   #14
Senior Member
 
City: Owings, Md
Country: US
Join Date: Jan 2016
Posts: 246
I pulled the thru hulls from the main and air conditioner yesterday off a 1986 Mainship 34'. It was on this year's maintenance list anyway but the visual of the pics above was motivation. The bronze was in good shape on each but both had wood backing plates that were deteriorated. Neither were bonded.
__________________

Gdavid is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





All times are GMT -5. The time now is 12:35 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012