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Old 09-16-2013, 09:20 AM
if you beat my boat, well race
 
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thread sealent

good morning e-campers.

could someone please give me the run down on the type of sealent they use on these 5 types of fittings??

ive never used AN fittings before and i dont want ANY leaks.

1) AN fittings for brakes
2) " " for fuel
3) sealent for water fittings
4) for intake manifold plugs
5) for oil ports

i know this is a newbie question, but i want to make sure i have all my quackers in line.

thanks guys!

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Old 09-16-2013, 10:08 AM
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Quote:
Originally Posted by h0trod View Post
1) AN fittings for brakes
2) " " for fuel
3) sealent for water fittings
4) for intake manifold plugs
5) for oil ports
You apparently only have two types of fittings here, AN fittings (37 degree flare) and NPT fittings (coolant, intake plugs, and oil ports).

AN fittings use NO sealant, period. The flare makes the seal. The threads do not seal at all and any sealant is wasted and makes a mess. If you are using aluminum AN fittings, it helps to use lubricant or anti-seize on the threads, but use it sparingly and don't get any on the flare sealing surfaces.

Some will point out that NPT fittings shouldn't need sealant either, since the tapered threads are what seals, but in reality teflon tape or brush-on teflon sealer is usually a good thing, if only to lubricate the threads.

You didn't ask, but inverted flare fittings (factory style brake and fuel fittings, as opposed to AN fittings) also do not use any sealant. The metal-to-metal flare is the seal. If the flares are damaged or mis-formed, you CAN get flared copper sealing washers, though remaking the flare is a far better choice.
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Old 09-16-2013, 10:59 AM
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thank you joe.

some of the items that were going through my head..
(in case you cant read my mind)
were aluminum, to which I believe are stainless adapters
i.e. hardware to willwood calipers.
which you run the stainless steel braided hose to.
I know that flares ( of any type) do not need any sealant.
I asked from a rookie position so that I get everything right.

I have also heard that you do not want to run RTV in locations that
involve fuel and oil.

also that, fittings for the cooling areas require RTV and not teflon.

should we have myth busters do a segment on this?? haha

when using brush on teflon, what is the best way to not make a complete mess?

I always think i need to gob it on in order for it to create a good seal. and I end up making a complete mess.

is there a "proper procedure for dummies"?
or should i just use tape?
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Old 09-16-2013, 11:27 AM
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Quote:
Originally Posted by h0trod View Post
were aluminum, to which I believe are stainless adapters
i.e. hardware to willwood calipers.
which you run the stainless steel braided hose to.
I know that flares ( of any type) do not need any sealant.
I asked from a rookie position so that I get everything right.
That's where I'd use anti-seize on the threads only.

Quote:
I have also heard that you do not want to run RTV in locations that
involve fuel and oil.
I wouldn't use RTV on threads, but I've used RTV on valve covers and oil pans with no problems. Even the factories started doing this in the 1980s.

Quote:
also that, fittings for the cooling areas require RTV and not teflon.
That I haven't heard. In fact, many folks recommend using nothing on threads for sending units, as the threads are usually the ground path. Teflon tape will get mashed around enough that there is always metal-to-metal contact, at least enough for the sending unit ground.

Quote:
when using brush on teflon, what is the best way to not make a complete mess?

I always think i need to gob it on in order for it to create a good seal. and I end up making a complete mess.

is there a "proper procedure for dummies"?
or should i just use tape?
You don't need much of the brush-on sealant. LocTite sells teflon sealant in a small tube, which makes application easier. Frankly, I just use the thicker pink teflon tape and use 1.5-2.5 wraps around the male threads.
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Old 09-16-2013, 12:34 PM
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Locktite 518 was developed for aluminum and dissimilar metals, metal to metal seams, like motor cycle cases.
Anaerobic, sets up but doesn't harden. Good thread locker also. Clean up with alcohol so not for fuel lines.
Pat
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Old 09-16-2013, 03:06 PM
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Quote:
Originally Posted by tapkoote View Post
Locktite 518 was developed for aluminum and dissimilar metals, metal to metal seams, like motor cycle cases.
Anaerobic, sets up but doesn't harden. Good thread locker also. Clean up with alcohol so not for fuel lines.
Pat
I've used it. It's really good stuff.
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