Quote:
Originally Posted by Ron B.
Brett
That would be my best guess. I don't think it is where the hose is crimped to the fitting. I had some of those seals you mentioned but I think they got damaged in storage. Do they work? I'm just thinking that we had a leak at the cooler and we might have tightened this fitting or rather overtightened. The AN fitting that we may have overtightened has been replaced but the hose end is still the original. Would there be a possibility we damaged the hose end over tightening?
thanks Ron
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Ron,
Yes the AN nose cone seals do work.
Now at this point we are well that the 37? Male/Female surfaces forms a
physical seal (sometimes called a mechanical seal). Now when there are foreign objects between the Male/Female surfaces we will not get a proper seat.
By the same token if we over tighten then the Male/Female AN surfaces can become deformed.
Now there are 2 (two) ways one can check for this. The first way is to place a "dab" of Lap Compound on the male surface, then place the female on the male and tighten down (working back and forth as you do). Now take the two components apart and then look at the male surface. If the seal is a proper one you will see a continuous ring where the 2 (two) surfaces mated properly.
If on the other hand you see "gaps' in the ring you will know that you are not getting a proper seal.
Now the above is great.....if you can remove both the fitting and the hose.
If not then its on to "Plan B"...i.e. the nose cone seal.
Simply remove the hose from the male AN fitting, wipe the male to ensure that there is no debris or foreign objects there and place the nose cone seal on the "nose" of the male AN fitting. Replace and re-tighten hose. Then check for leaks/weapage . Again this is great when you can not easily remove the hose or fitting of if you have found a "new" leak just prior to flying home (nose cone seal weight next to nothing and IMHO should be in everyone's field repair kit).
Now a -6 nose cone seal runs $1.35 (here as I cant speak for other suppliers)
and is a far less expensive way to go (as opposed to replacing the hose its self). Now nose cone seals may be purchased from several sources (as I said I know Aircraft Spruce carries them as well) just be sure that you are getting a "name brand" (i.e. Seco for example).
I hope that the above was found to be some what helpful.
Regards,
Brett