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General Liquid/Water Cooling Discussion For discussion about Full Cooling System kits, or general cooling topics. Keep specific cooling items like pumps, radiators, etc... in their specific forums.

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Unread 06-11-2004, 10:47 PM   #1
Stiffler
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Default Sealing barbs to pump...

My pump's manual says not to use teflon tape to create a watertight seal for the inlet and outlet. What should I use instead? I would like to be able to remove the barbs if I have to also. Any ideas?
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Unread 06-11-2004, 11:20 PM   #2
Groth
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Teflon tape can be sliced into tiny shreds when screwing fitting together. Tiny shreds of teflon clog waterblocks and wrap around impellors.

What pump?
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Unread 06-11-2004, 11:28 PM   #3
Stiffler
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It's a Dolphin Pond 385GPH pump. Is there some sort of silicon caulking that I can use but wont seal permenantly?
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Unread 06-11-2004, 11:39 PM   #4
Groth
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The putty-like thread sealers commonly known as 'pipe dope' should work. Any place that sells plumbing parts will have it.

Does that pump have a fairly thin plastic housing? Another reason they warn against teflon tape is that it makes it easy to over-tighten the barbs and crack the housing. Plastic fittings reduce this risk.
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Unread 06-12-2004, 05:29 AM   #5
nexxo
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True, but I have used teflon successfully. It's all in how you wrap it around the thread of the barb, and how carefully you screw it into the pump.
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Unread 06-12-2004, 09:06 PM   #6
Stiffler
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Alright, I'll get some plastic fittings and some pipe dope. Thanks for the information. I didn't even think about the tape getting into the system. Thanks.
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Unread 06-13-2004, 09:33 AM   #7
bobkoure
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Loctite makes a teflon pipe sealer paste that I like a lot. Very useful stuff. Your local auto parts store almost certainly has it...
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Unread 06-15-2004, 06:57 AM   #8
Turbokeu
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Quote:
Originally Posted by bobkoure
Loctite makes a teflon pipe sealer paste that I like a lot. Very useful stuff. Your local auto parts store almost certainly has it...
I use this sealant from Loctite and I like it a lot too:

It's normally meant for plastic threadings but it works great on metal or mixed threadings too, and it's not permanent.

CD

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Unread 06-15-2004, 07:26 AM   #9
Stiffler
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And none of these will seal so tight that I can't get the barbs off with a little force, right?
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Unread 06-15-2004, 09:14 AM   #10
Turbokeu
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Quote:
Originally Posted by Stiffler
And none of these will seal so tight that I can't get the barbs off with a little force, right?
The Loctite 5331 is flexible after drying, and not permanent.

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Unread 06-15-2004, 09:49 AM   #11
bobkoure
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And the teflon paste will actually make it easier to remove (than dry threads).
FWIW, I've gotten fittings loose that have been sealed with Goop - but they were metal-on-metal and I was using an air impact wrench.
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