JIC couplings

Talk about technical issues here. Questions and answers!

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hair bear
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JIC couplings

Post #1 by hair bear » Fri Oct 06, 2023 10:39 pm

Is there a trick to get JIC couplings to seal?
Just changed a deceased ram and the old couplings won't seal to the new ram. The ram fittings are identical from what I see but they just won't stop dripping.
Ideas anyone?
If a LandRover doesn't leak oil, it's run out.


essexpete
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Re: JIC couplings

Post #2 by essexpete » Fri Oct 06, 2023 11:54 pm

Have you perhaps over tightened? Annoying, but I wonder if there is slight damage?


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Re: JIC couplings

Post #3 by gecko.cx » Sat Oct 07, 2023 7:19 am

Same as BSP (apart from the obvious differences). The sealing relies on the mating of the conical surfaces. If it's weeping, either the faces aren't mating correctly or the contact pressure is light.
If you are confident the thread isn't binding or similar, I'd loosen the nut slightly and with a tool on the ferule, work the hose back and forth as you tighten the nut. Hopefully you'll that'll reshape the mating surfaces.


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Re: JIC couplings

Post #4 by hair bear » Tue Oct 10, 2023 11:12 pm

Thank, I'll have a look over the w/e.
If a LandRover doesn't leak oil, it's run out.


Topic author
hair bear
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Re: JIC couplings

Post #5 by hair bear » Mon Oct 16, 2023 8:53 pm

Ok, so a closer look revealed that on the old ram the union nut has a couple of threads visible when tight and sealed (just refitted it to check). On the new ram the sockets appear slightly deeper and the nut is tight and threadbound before the union seals. I've contacted the supplier for suggestions so we'll see what happens.
If a LandRover doesn't leak oil, it's run out.


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