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Extremely leaky AN fitting on oil return line

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my98GST

15+ Year Contributor
1,045
21
Jun 1, 2005
Cleveland, Tennessee
I recently purchased my PTE turbo from ExtremePSI and got the install kit with it. On the oil return it has AN fittings and a tube for the oil to go back in to the oil pan. On the oil pan side, there is the adapter that goes into the oil pan, and then its got a threaded part where it accepts another AN fitting that has the nipple to slide into the hose. Where the nipple goes inside of the female fitting to be screwed onto the oil pan fitting, its leaking excessively from there. What can I do?
 
Make sure the threads are the right size first. Then make sure you didn't cross thread them. Then reinstall it using teflon tape around the fitting to help ensure it sealing.
 
yeah its not cross threaded... its coming out of the front of the female fitting so I guess its working its way back around. I suppose I could try the teflon......If that doesn't work, any suggestions besides "a new one?"
 
With an -AN fitting (37*), the threads are NOT what makes the seal. You'll notice an angled portion at the end of the male portion and a mating angle on the female portion. You probably "buggered" the angle portion that makes the seal, or as stated, cross-threaded the fitting.

At that point it is NOT really repairable IMO. Get a new fitting(s).

The only other thing is that you may have a mix-match of fittings (-AN (37*) to a 45* flare).


http://www.fordmuscle.com/archives/2004/12/ANfittings/index.php
 
You should NEVER use teflon tape on AN fittings. AN fittings can leak as a result of overtightening and damaging the compression seal.

More than likely, you have a damaged fitting, or you are dealing with a improperly assembled hose/line.

Who assembled the return line? Which specific options did you purchase with this kit,

Which style of line did you purchase? Did you purchase the XRP stainless line (silver) with regular Aeroquip fittings, or did you purchase the socketless line (blue)with the pushlock fittings.

On the images at Extreme PSI, they show the stainless kit using a straight fitting and a 30 degree fitting, ~10" of XRP line, gaskets and adapter fittings to bolt onto the oil pan and the turbo oil return. The socketless kit shows them using a 90 degree pushlock, a straight pushlock fitting, 10" of socketless line, gaskets and adapter fittings.

If you did fabricate these lines yourself, inspect that you installed the line into the fitting properly -- if you don't understand what it should look like when properly installed, you should consult Aeroquip's instructions ( http://hydraulics.eaton.com/products/pdfs/fc/A-SPPE-MC001-E2.pdf )(page 41 and 42 for reference). You should always use an assembly lube with both styles of fittings for this application. The assembly lube should be S.A.E. 30 lubricating oil or Aeroquip FBM3553 hose assembly lube. Personally, I have had the best experience with Lucas Heavy Duty Oil Stabilizer -- it is cheap, and you get much more for the money spent.

If you feel that you cannot do this on your own, go to a local performance shop (that actually has experience with real race cars -- even if it means going to a domestic shop, not rice cars), and have them do it for you. If the fittings are still in good condition and not visually damaged (inside or outside), they are usually reusable. The hose is reusable, EXCEPT for the section that was previously installed in the fitting.


If you are still having problems with leakage, you should really check the other variables; i.e. gaskets and adapter fitting surfaces. Even then, if you are having difficulties with a leaking oil line, use the pushlock fittings with the Aeroquip socketless (blue) line -- it is pretty much idiot-proof as long as you follow the directions from page 42 in the above referenced website for Aeroquip.
 

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Don't wanna start another thread, so I'll must continue this one. I purchased the 16g install kit from Extreme PSI. It's just the rubber hose, the nippled turbo fitting, and the 2-piece oil pan fitting, which is a threaded(female) flange piece and the nippled, angled piece that threads into the flanged piece.
It's not cross threaded. It's screwed in as far as it can go before hitting the oil pan flange. I've tefloned the hell out of it and even applied thread sealant. It still leaks oil. My conclusion is the threads are 2 fricking deep, a poor design or manufacturing defect.
My question is, how can I seal this up? Is there an awesome sealant I can use or something? I'm trying to work with what I have, before buying something else.
 
AN fittings do not require teflon tape as twicks69 mentioned. You only use teflon tape on NPT fittings... but many people often confuse the two
 
Heres what you do. Buy a bulkhead fitting, buy a locknut, buy a Teflon washer, buy a O-ring, make it look like the photo , thread the whole thing into the oil pan fitting, secure down the locknut. This should stop the leaking.
 

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