Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 16-09-2013, 18:51   #1
Registered User

Join Date: Dec 2007
Posts: 95
Seachest refit

So the boat has a seachest to handle all raw water coming into the boat. It is fiberglass built into the hull and has 6 raw water lines going out of it (engine intake, heads, manual foot pump). There should be a picture attached.

The top appears to be plexiglass or lexan. The wingnuts are fairly corroded and the petcock is corroded to the point it is not usable. The outputs appear to be bronze and you can see by the green they are pretty old and have developed a strong patina.

I need to refurbish the box. I'm not sure I want to change out the bronze fittings but the top definitely needs work. I will at least change out the hoses and clamps attached to these fittings.

For the corroded studs that hold the wingnuts I was thinking of removing them from the fiberglass, using epoxy to fill the old holes and to hold the new studs in place.

For the top I'm not sure what to use. Any suggestions? I also am not sure what type of sealant to use between the chest and the top. I don't want something permanent because it is designed to be disassembled to remove any foreign matter that gets introduced. Maybe 4200 but that might be too strong. Any ideas about this or the plan overall. I've not done this before so I'm not sure what I need to watch out for.

Any wisdom is appreciated.
Attached Thumbnails
Click image for larger version

Name:	seachest.jpg
Views:	132
Size:	217.5 KB
ID:	67339  

SeaSloth is offline   Reply With Quote
Old 18-09-2013, 07:03   #2
Registered User

Join Date: Jul 2009
Location: 2018 - cruising Greece
Boat: Amazon 49 cutter, custom steel boat built in Surrey, Canada
Posts: 469
Images: 1
Re: Seachest refit

Making a new top of Lexan seems reasonable to me. You want it thick enough to be fairly rigid so it won't warp with time. Perhaps 3/8" is too thick, but that's where I'd start if it were my boat.

What seals the top of the sea chest now? I would think a gasket of 1/8" rubber would seal any imperfections in the sea chest lip. You can usually get sheet rubber at auto parts stores. They sell it as gasket material.



steve77 is offline   Reply With Quote
Old 18-09-2013, 07:14   #3
Senior Cruiser
rebel heart's Avatar

Cruisers Forum Supporter

Join Date: Oct 2005
Posts: 6,190
Images: 3
Re: Seachest refit

I'd do 4200 unless you use it for a watermaker's input. The possibility, at least in the beginning, of errant petrochemicals getting into the watermaker would scare me a bit.

I'd second the Lexan but just be careful and maybe buy a piece big enough to make a couple of them because with that many screw holes it would be easy to shatter it and get little cracks running through it.

I always liked the idea of a seachest, especially now that I have a watermaker and want to have non-aerated sea water as an input.
rebel heart is offline   Reply With Quote
Old 18-09-2013, 07:26   #4
Registered User

Join Date: Dec 2007
Posts: 95
Not sure what sealant is used now. It appears to be something squozen from a tube. According to the west marine advisor silicone is probably the best choice for lexan to fiberglass. I'm guessing that is what is on there now. I think some silicones are rated for below waterline use as well.
SeaSloth is offline   Reply With Quote
Old 18-09-2013, 07:31   #5
Registered User

Join Date: Dec 2007
Posts: 95
Rh, I didnt think about the water maker. It does have one but I have no idea if it works or what condition it is in. I will likely use it if I can when I get to that point. I could use a pipe dope that is rated for potable water connection, I suppose. It really doesnt have to hold the lexan down, the wingnuts will do that. It just has to make the seal watertight.
SeaSloth is offline   Reply With Quote
Old 18-09-2013, 07:43   #6
JPA Cate's Avatar

Join Date: Nov 2011
Location: aboard, cruising in Australia
Boat: Sayer 46' Solent rig sloop
Posts: 12,256
Re: Seachest refit

Sea Sloth:

A long time ago (in Internet terms) CF ran a fairly long thread about rehabilitating watermakers left pickled for a long time. When you're ready to approach that one, I suspect there will be folks here who will be able to point you in the right direction. Jim actually did it, but it was so long ago, neither of us remembers exactly what was done.


Who scorns the calm has forgotten the storm.
JPA Cate is offline   Reply With Quote


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 12:06.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.