AN 8 fitting leak!

thekera · Posted: Sat Apr 19, 2014 6:05 pm Post subject: AN 8 fitting leak!

So went to fire up my 1776 for the first time last night and heard a psssss noise like a tire losing air. Looked under near the full flow filter and saw this:

Image may have been reduced in size. Click image to view fullscreen.

Now I've never ran full flow but thought these were the lines to get if you do? Now the lines seem short to me. So I tried some brass fittings to give it a inch or two but the leak seem to be at the swivel collar of the 90 AN fitting, the portion I believe that takes a 21mm wrench.

Bad fitting? Did I do domething wrong? Common problem? What is a leak prove product? Hydraulic line better as there are many in town?
Thanks

BDubVdub · Samba Member Joined: October 11, 2006 Posts: 612

Is that a brass fitting where the 90* AN fitting is threaded onto?

juki48 · Posted: Sat Apr 19, 2014 6:20 pm Post subject:

is that teflon tape on the AN fitting? is that actually an AN fitting?
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getgeoff · Posted: Sat Apr 19, 2014 6:25 pm Post subject:

With AN hardware I dont think there were any brass fittings used. They are usully alumium and the flare for an AN fitting and others like NPT are different. You may need to use a AN fitting like a coupler to get the extra reach you need. AN is flared at 37 and NPT is 45 degrees I think.

BDubVdub · Samba Member Joined: October 11, 2006 Posts: 612

Looks to me like he has teflon tape on that brass looking coupler that goes in the other brass coupler. If that brass coupler is JIC it's fine but take the tape off it. If it's not JIC, ditch it and get an aluminum AN fitting.

thekera · Posted: Sat Apr 19, 2014 7:02 pm Post subject:

I had a aluminum AN fitting on there originally but it was leaking. Then tried the brass fittings to see if it just needed some length to relax the line as I thought the threads might be getting stressed. Now if you look at the pic you see the drip of oil? It's at the swivel portion of the 90 where the threaded coupler is around that seam. Kinda hard to explain. I guess the fwd seam of the 90 21mm bolt where you tighten the fitting.

BDubVdub · Samba Member Joined: October 11, 2006 Posts: 612

Did you have teflon tape on the AN flared fitting?

thekera · Posted: Sat Apr 19, 2014 7:17 pm Post subject:

Yes, I did. That a no no? I thought I read in another post to use Teflon tape? I zoomed the photo to try and show the leak location.

BDubVdub · Samba Member Joined: October 11, 2006 Posts: 612

That is a no no. You do not need teflon tape on the flared portion of an an fitting.

thekera · Posted: Sat Apr 19, 2014 7:32 pm Post subject:

I just did a wrap on the threads not the taper. Should I just pull the tape? But it's also not leaking there it's leaking on the other end where the swivel bolt meets the 90 bend tube idk though not familiar with these fittings as I've never had full flow. Do I need a new 90 fitting and line? Or is there a cheap simple fix? How tight should these be tightened? I didn't go super tight at first and thought maybe it just need one or two more turns. Tried but still leaked when I went to turn the engine over.

thekera · Posted: Sat Apr 19, 2014 7:42 pm Post subject:

I can see oil seep from the seam on the left in the last photo I posted while turning the engine over.

juki48 · Posted: Sat Apr 19, 2014 7:45 pm Post subject:

BDubVdub · Samba Member Joined: October 11, 2006 Posts: 612

It really shouldn't be leaking. There should be 0 teflon tape on any AN fitting used. If there isn't any tape and it's still leaking at the hose end the hose end is probably bad. However, I've never seen a "bad" hose end.

pallen · Samba Member Joined: February 15, 2012 Posts: 589

Looks like to me...

The brass fitting is not the correct taper, so its not seating into the AN fitting correctly, it looks like all the teflon tape is sealing it so its pushing out the back of the fitting...

You need these:

http://www.summitracing.com/parts/aei-15616?seid=srese1&gclid=CJXRxb2H7r0CFRQV7AodI0wAig
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thekera · Posted: Sat Apr 19, 2014 8:24 pm Post subject:

Now here is what I started with originally before trying the brass.

Are these proper taper? They came with the line from my engine builder.
Now some one mentioned sealant? What kind? Do these lines usually stay leak free? Is there a line that will last a long time, and not leak for sure. I'm starting to believe it's the 90 fitting.

modok · Posted: Sat Apr 19, 2014 8:28 pm Post subject:

I've not been impressed by the aluminum female fittings.
had two of them bind up where the female part rides against the middle part, they should put a steel washer in there so they don't do that.

thekera · Posted: Sat Apr 19, 2014 8:48 pm Post subject:

Now I'm not even to sure of the process to put these braided lines together? How do you install the fittings on the braided lines? Now are hydraulic lines a little less likely to leak? I'd like something I'm not gonna have to worry about springing a leak, if that exists?

BDubVdub · Samba Member Joined: October 11, 2006 Posts: 612

That fitting you just posted isn't aluminum. It's steel. I've never had an AN fitting or line leak. Ever. I think it's mismatched flares. Get an actual AN fitting and try that.

Jcr. Kat · Posted: Sat Apr 19, 2014 10:09 pm Post subject:

Teflon tape is for weekend plumbers you a plumber?

Dale M. · Posted: Sun Apr 20, 2014 6:58 am Post subject:

Teflon tape is for tapered (NPT) threads only.... Any straight thread fitting uses entirely different seal (flair) and Teflon tape is not necessary.... Alternative to TEFLON tape for tapered fittings is standard "pipe dope" or any thread seal goop.... Teflon tape is not always your friend as it can depart from where are using it and end up in some place you don't want it as in a oil passage or whatever....

Dale
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