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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 12-07-2020, 02:25 PM   #15
86TOYO2k17
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+1 Main reason it should not be used with AN fittings. ...in this application, at least.
If you light some candles, dim the lights, turn on some smooth jazz, poor some champagne, and give your AN fitting a bath in thread sealant you might have a problem.
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Old 12-07-2020, 02:32 PM   #16
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If you light some candles, dim the lights, turn on some smooth jazz, poor some champagne, and give your AN fitting a bath in thread sealant you might have a problem.
It's all upstream of the filter but janky work is janky.
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Old 12-07-2020, 04:14 PM   #17
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It's all upstream of the filter but janky work is janky.
It's upstream until you have a different application with a remote filter. Then you're just an underpaid toyota technician trying to rebuild boxer motors lol

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Old 12-07-2020, 08:40 PM   #18
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It's upstream until you have a different application with a remote filter. Then you're just an underpaid toyota technician trying to rebuild boxer motors lol
You have me there. That's just sad.
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Old 12-08-2020, 09:00 PM   #19
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how did you pressure test the lines? air? water? oil, cold/hot?

where are the lines leaking? you mention crimping, is it leaking at the hose but before the connection, or at the threaded connection point?

what sealing methods have you attempted so far?

Was not getting notifications for this, sorry. Pressurized the lines and the core as an assembly with about 200psi of air. Outdoor temp was around 80 I would guess. And I dunked them into a tank of water, no bubbles to be seen.


And they are leaking around the nut side, at the top where the nut articulates.
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Old 12-08-2020, 09:02 PM   #20
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These gaskets are a godsend. I keep extras on hand.





I actually have these installed, and I am still having issues with one fitting. Might have to bite the bullet and buy yet another fitting and seal.
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Old 12-08-2020, 09:04 PM   #21
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Whenever I've used AN fitting, I don't tighten them much. If you're putting any force into tightening it, it is more prone to leaking in my experience.

Do not use PTFE tape

Just make them a little snug and allow the system to put pressure to them. After a few warm/cool cycles, make them a little more snug. I've even gotten Mishimoto AN fittings to hold this way

I have tried everything from just past snug, to way tighter than they should ever be and I get the same seeping every damn time.
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Old 12-08-2020, 09:23 PM   #22
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I have tried everything from just past snug, to way tighter than they should ever be and I get the same seeping every damn time.
I'd just replace the fittings. I use Phenix fittings for my stuff and don't have issues
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Old 12-08-2020, 09:23 PM   #23
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I actually have these installed, and I am still having issues with one fitting. Might have to bite the bullet and buy yet another fitting and seal.
In my case, the female side of the 12-AN fitting was bent together ever so slightly into an oval. I don't know if they are dropped in a step of the manufacturing process, piled together too deeply in a bin, or whatever. It's disappointing that it is so common. I'd gladly pay a premium for better quality control.


Phenix? Hmmm.... They sure are pretty. I'd have gone with them had I known.


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Old 12-10-2020, 07:27 PM   #24
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No dope or tape on AN fittings period. I have built hundreds and installed thousands of AN fitting hoses. If torqued correct they almost never leak. Yes on troublesome ones the conical seals help.
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