Is that an good idea to put sealant or RTV on AN fittings?

[dongoesby]

I'm installing my Taka turbo lines on my s14 SR motor. For the AN fittings, I have heard mixed reviews that people installed on their motor. I have just installed them on the block with copper washers. As for insurance, is that an good idea to put sealant or RTV on these AN fittings (water in/out and oil)?

[japslapsilvia]

NO. AN fitting seal by the Flare. do not use RTV to seal AN fittings togather.

There are "seals" for AN fittings, called Seco7 seals or conical seals, those are the only type of seal that you would use on an fittings and those are ONLY used if the fittings have nicks or scratches on the sealing surface.

[upstate240sx]

NO. AN fitting seal by the Flare. do not use RTV to seal AN fittings togather.

There are "seals" for AN fittings, called Seco7 seals or conical seals, those are the only type of seal that you would use on an fittings and those are ONLY used if the fittings have nicks or scratches on the sealing surface.

good to know

[ManoNegra]

Army/Navy - hence the AN - fittings were designed to seal the way they come.
Nothing else required.

[ZilviaKid]

fuck, now i have to remove some tape..

[dongoesby]

NO. AN fitting seal by the Flare. do not use RTV to seal AN fittings togather.

There are "seals" for AN fittings, called Seco7 seals or conical seals, those are the only type of seal that you would use on an fittings and those are ONLY used if the fittings have nicks or scratches on the sealing surface.

I might be wrong, but the actual AN flare is between the AN fitting and the Taka line end/plugs. To be clear, the AN fitting has two ends, the end that goes toward the engine is not an AN flare and the end goes toward the Taka line is AN flare which creates seal by itself. Enlight me.

[japslapsilvia]

I might be wrong, but the actual AN flare is between the AN fitting and the Taka line end/plugs. To be clear, the AN fitting has two ends, the end that goes toward the engine is not an AN flare and the end goes toward the Taka line is AN flare which creates seal by itself. Enlight me.

Correct.
The Fitting has 2 ends, one is the actual AN side, which has the 37* flare. That flare will seat against the Concave end of the actual hose end and create a seal.

The other end of your fittings are Metric (the ones that screw into the block) and Inverted flare, the one that screws in the turbo. The metric ends have to use the crush washer b/c they will NOT seal by the threads. It would be pointless to use RTV or Teflon tape for these fittings. The inverted flare fitting that screws into the turbo will seal by the flare (like the AN fittings) so there is NO need to put Teflon or RTV.

It should also be noted that Teflon tape should ONLY be used for Tapered Pipe threads. Such as NPT or BSPT. The reason is that those fittings seal b/c of the taper in the thread.

The metric fitting that screw into your block are Straight or Parallel thread…they cannot seal by the actual thread but rather seal by the “seat” of the fitting, hence the crush washers.

[MURPHY]

while we're on the topic of AN, NPT fittings and turbo lines, does ANYONE know the size of a RB oil drain on the block?

[japslapsilvia]

while we're on the topic of AN, NPT fittings and turbo lines, does ANYONE know the size of a RB oil drain on the block?

if its the same as SR (i dont know for a fact if it is) then its 1/2" BSPT.

[dongoesby]

Correct.
The Fitting has 2 ends, one is the actual AN side, which has the 37* flare. That flare will seat against the Concave end of the actual hose end and create a seal.

The other end of your fittings are Metric (the ones that screw into the block) and Inverted flare, the one that screws in the turbo. The metric ends have to use the crush washer b/c they will NOT seal by the threads. It would be pointless to use RTV or Teflon tape for these fittings. The inverted flare fitting that screws into the turbo will seal by the flare (like the AN fittings) so there is NO need to put Teflon or RTV.

It should also be noted that Teflon tape should ONLY be used for Tapered Pipe threads. Such as NPT or BSPT. The reason is that those fittings seal b/c of the taper in the thread.

The metric fitting that screw into your block are Straight or Parallel thread…they cannot seal by the actual thread but rather seal by the “seat” of the fitting, hence the crush washers.

Very informative. Thanks! In additional of yours, I found both Metric and Inverted flare to be the same for the water in/out fittings (I believe it is the same for oil hose fitting except for the oil restrictor which couldn't go in all the way). All the fittings (metric/inverted) look exactly the same. Said by Harp, the maker of Taka lines, he uses nothing on his setup, no sealant, no teflon, nothing. And he never experiences a drop of oil leaking out from his block or turbo.

However, base on what you said that Metric seals by where it is sitting rather than the thread, would it be an added insurance to put high-temp sealant onto the thread of Metric fitting? I know those sealant goes up to 200 C.

As for the Inverted flare, I think I'm feeling good to just leave it as is with copper washers.

[landins13]

use teflon thread tape if youre concerned with it that much but dont use rtv thats just rediculous

[GSXRJJordan]

To recap:
AN flared fitting: Looks like a nipple. No tape/sealant/anything.
NPT/BSPT: Tapered threads. Use teflon tape if it's water, or oil-safe thread-sealant (Permatex white tube, red "high temp" label, Autozone) if you're paranoid.
Metric O-ring/crush washer: Non-tapered threads - make sure the mating face is flat/clean. Don't use any sealant, it'll just mess with the washer or o-ring. Don't overtorque.

[timlush]

while we're on the topic of an, npt fittings and turbo lines, does anyone know the size of a rb oil drain on the block?

3/4 npt ....

[japslapsilvia]

3/4 npt ....

its not NPT. its BSPT, they are very close in thread pitch. BUT they are different. you can use a NPT fitting in the motor BUT there is a small risk of damaging the threads.

Most if not ALL Japanese and Euro cars use BSPT, not NPT.

[timlush]

Well the NPT threaded right in and doesn't leak so it works for me.