| Author |
Message |
    
Bob Dunne
Member
Username: bobct
Post Number: 31
Registered: 10-2009
| | Posted on Sunday, November 15, 2009 - 08:40 pm: | 
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On one of my engine raw water intakes has a piece of silicone trapped inside the scupper underneath the boat. I tried getting it with a pick but it's too big. It's probably blocking 20% of the intake so I want to take care of it.
I have the exact same issue with the A/C pick up as well. I unbolted the seacock from the inside but it wouldn't budge. I figured I would remove the scuppper/strainer from underneath the boat but couldn't get it off either. It's basically triangular shaped. I cleaned up the whole thing and removed a screw on each side.
I can now get the front to move down a little but the back (the point of the triangle) won't budge. There's no other fastener so I'm not sure what's holding it in place.
So, before I get too far trying to remove things that are probably held with 3M 5200, is there a way to disassemble the seacocks from the inside w/o completel removal so I can clean them out?
This must happen all the time right?
thanks,
Bob |
makomark
Senior Member
Username: makomark
Post Number: 1892
Registered: 09-2008
| | Posted on Sunday, November 15, 2009 - 09:46 pm: |
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Bob:
Silicone is a good choice for underwater fittings. If that is what you see, I'd be inclined to pull all the thruhulls and get rid of all the silicone.
Most assemblies let you remmove the sea cock from the thru hull. That should let you get anything out of the scoops. a long pair of forceps is good for that task. |
Fastjeff
Senior Member
Username: fastjeff
Post Number: 7138
Registered: 09-2003
| | Posted on Monday, November 16, 2009 - 06:24 am: |
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You could CAREFULLY cook it out of there with a Benzomatic torch. Silicone turns hard with heat, so it could be chipped into small enough pieces to be flushed out with a hose.
Jeff |
diver dave
Advanced Member
Username: diver_dave
Post Number: 510
Registered: 08-2008
| | Posted on Monday, November 16, 2009 - 08:58 am: |
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Mark forgot the word NOT. Use 3M101 for this task going forward.
Typically for thru hull dissassembly, the seacock stays put and you work on the U/W stuff first. |
Bob Dunne
Member
Username: bobct
Post Number: 32
Registered: 10-2009
| | Posted on Monday, November 16, 2009 - 09:14 am: |
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Yes, I mentally inserted the word "NOT" as I was reading that 
So, if I approach this from below, does the clamshell scoop slide onto the thru-hull fitting?
I'm trying to figure out what is holding the back part. I was expecting a 3rd screw but there's nothing there.
The intake slits are too close together to "pull" anything out even if I did heat it up.
Bob |
diver dave
Advanced Member
Username: diver_dave
Post Number: 512
Registered: 08-2008
| | Posted on Monday, November 16, 2009 - 10:21 am: |
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There are two types of scoops. One is independant of the sea cock and is wood screwed around its perimeter into the hull. THis type should not need any sealant.
The other type is actually threaded into the seacock, thereby replacing the thruhull piece. If the PO used 5200 on these threads, it will be a bad day at the yard for you. It sounds like silicon rubber was used, which is quite weak. |
Bob Dunne
Member
Username: bobct
Post Number: 33
Registered: 10-2009
| | Posted on Monday, November 16, 2009 - 10:46 am: |
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hmmm, maybe I should try turning it then (unscrewing it) and see if it moves. I have a feeling that these are original, probably not touched in 20 years.
If I can diassemble the seacock enough from the inside to clean it out, I'll be happy. That's all I really need to do - get to the pick up from either side. |
makomark
Senior Member
Username: makomark
Post Number: 1897
Registered: 09-2008
| | Posted on Monday, November 16, 2009 - 11:27 am: |
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Dave - thanks for catching that critical omitted word!
Bob-You should be able to tell if the scoop is integrated with the thru hull by probing thru the slots. The integrated scoops have a plate that connects the clamshell to the threaded portion that usually runs the width of the scoop. By moving you pick, from fore to aft, with the tip against the hull, you should be able to detect that step this plate would create. If no step, then the clamshell should come of pretty easily.
Sometimes, a scotchbrite wheel run around the perimeter of the clamshell makes for finding all the screw heads an easier task. |
