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Old 05-12-2012, 09:14 AM
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A/C - Heater bulkhead plate leaks

I have one of those billet 4 line bulkhead panels to pass the A/C and heater fittings thru the firewall. A couple of the fittings won't tighten... what I mean by that is I can get the nut tight, but the fitting itself still pivots. Consequently, I have a leak. The first thing I thought of is the nut might be butted tight against the plate - but it is not - there are still some threads left. So I can't figure out why this is happening. Has anyone else run into this problem? What's the fix?

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Old 05-12-2012, 10:17 AM
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Do you have the silicone 'O' rings on the fittings? There are supposed to be 3 different sizes - #6, #8 and #10, depending on the lines use and will not seal without them. Those nuts will come close to the end but a thread or so will possibly show.
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Old 05-12-2012, 12:04 PM
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Yep - had the correct o-rings installed. And you are correct, a thread or two still shows beyond the end of the nut.

Looking at the hose fittings, it seems like the shoulder that the nut pushes against is supposed to ride up against the bulkhead fitting and then the o-ring slides inside the machined cavity in the bulkhead. That all looks right - but the shoulder just does not get pushed up to the bulkhead tight enough to prevent it from turning. It doesn't turn real easy, but easier than it should I think.

Based on the above theory though, it would seem to me that the o-ring would be the sealing element, so even if the shoulder of the hose fitting wasn't tight against the bulkhead fitting, that it should still seal. I'm starting to wonder if I have found yet another crappy quality aftermarket item from China!
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