The Murphy Builders Site

Hi Drew

Thanks for the update. When you remove the fitting it might be
interesting to see if the o-ring shows any sign of deterioration from
the oil. I don't know if you can actually remove the o-ring easily.
AFAIK either BUNA or viton is fine with automatic transmission fluid.

I would have guessed that the parflex and the DOT approved tubing is
essentially the same material. When I researched plastic tubing, I
concluded that everything except teflon would likely gradually become
brittle with oil or gasolene in it.

Ken

Drew Dalgleish wrote:

Hi Guy's Here's the prommised push loc fitting report. I changed the
fitting on my right float brake caliper a couple weeks ago. With the old
parflex line that has been on the floats since they were new and is now
very stiff I couldn't get the fitting to seal at all. leaked like crazy
right from the start. So I changed the tubing for some of the DOT aproved
stuff. Then I had a seal no leaks no problems. Flew around for a week and a
half without spilling a drop Then yesterday I went into the hangar and
found a big puddle under my right wheel. I don't know what caused the
fitting to start leaking just sitting there but it looks like I'll be
changing back to a regular compression fitting unless anyone has other
suggestions.
Drew

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hi Ken The o-ring is somewhere way down inside and there's a centre sleeve
so I haven't seen it. I did contact the supplier asking for advice and
they told me it was important to cut the tubing with a sharp knife not
side cutters and the cut has to be square. I don't remember how I cut it
the first time but it was likely with side cutters. I took it apart again
and cut a bit more off but it's still leaking a bit. I bought 3 fittings
(luckily that's all they had) so I'm going to try again with a different
fitting but I'm not very optimistic about it being a long time solution.

Hi Drew


Thanks for the update. When you remove the fitting it might be
interesting to see if the o-ring shows any sign of deterioration from the
oil. I don't know if you can actually remove the o-ring easily. AFAIK
either BUNA or viton is fine with automatic transmission fluid.

I would have guessed that the parflex and the DOT approved tubing is
essentially the same material. When I researched plastic tubing, I
concluded that everything except teflon would likely gradually become
brittle with oil or gasolene in it.

Ken


Drew Dalgleish wrote:

Hi Guy's Here's the prommised push loc fitting report. I changed the
fitting on my right float brake caliper a couple weeks ago. With the old
parflex line that has been on the floats since they were new and is
now very stiff I couldn't get the fitting to seal at all. leaked like
crazy right from the start. So I changed the tubing for some of the DOT
aproved stuff. Then I had a seal no leaks no problems. Flew around for a
week and a half without spilling a drop Then yesterday I went into the
hangar and found a big puddle under my right wheel. I don't know what
caused the fitting to start leaking just sitting there but it looks like
I'll be
changing back to a regular compression fitting unless anyone has other
suggestions. Drew

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