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Posted for Dick Reeve <dickreeve@gci.net>:
There's some magic stuff called 'fuel-lube' (brand name = EZ TURN LUBRICANT)
available at your local aircraft parts store.
It's designed specifically for pipe thread fittings such as are in the
sequence valves and retract cylinders but works EVERYWHERE!
It's description sez "Mil-G-6032D AM 1 TYPE 1 MILITARY SPECIFIED"
(for whatever that's worth) but also sez "EZ TURN is a specialty lubricant/sealant that is extremely effective where high octane fuel, certain chemical compounds, salt water and/or harsh environments are present. It will not crack or dry. Great for ant-corrosion, ant-sieze, anti-wear agents, gasket paste, gas valves, and in many other applications.
WARNING: KEEP OUT OF REACH OF CHILDREN
Temperature Range: Over 600degF"
I had your same question when working (bending and flaring) the
hydraulic and fuel lines. Dry aluminum is not happy - lube it.
I had to go back, disassemble and lube ALL fittings, the difference
was remarkable!
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Incidentally, a little dab on your finger will hold that pesky
blind nut or washer that you just can't get two fingers on ...
it's icky-sticky (one of the 'many other applications' above, I guess).
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I know this is probably Hydraulics 101, but how are most of you treating the
hydraulic line fitting threads (e.g, Legacy gear hydraulic lines) and fuel
line fittings? Do you use any sealant or Loctite on the threads? Do you
treat the "swedge" (tapered fit) fittings (like the ones that screw into the
sequence valves) differently from the "straight" ones? I've been told that
Loctite makes a special sealant just for hydraulic lines ... Do you
"torque" the fittings as well, or just hand tight plus a bit? What about
the fuel lines - treat these threads the same way?
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