I know when tightening An fittings you should use a light oil to prevent galling and to get better torque reading ,But what kind of oil? can I just use a little Motor oil on the fittings or does it need to be something special what about tapping oil?

 

don't know about AN fittings on cars but in millitary aircraft all we use is petrolatem (read vasoline that costs $20 a can)

 

I use 30 wieght to assemble the AN fittings. I don't use any oil to connect the AN fittings to a pipe end or what not.

Ron

 

At least you're not wasting that $20 petroleum jelly to lube those $900 toilet seats, then "realign" them with the $500 hammer...

You MUST be doing it the right way, since we all know what the "AN" originally designated, right? At least that SHOULD have been in the training. I know you have to be pretty careful about mixing compatible products in those critical systems. What are you using on synthetic/glycol hydraulic fittings?

 

I'm not sure what hydro shop or life support uses on it's AN fittings, my job is "aircraft fuels system mantance" and JP-8 exposed components get petrolatem and parts that are exposed to H-70(hydrozine (sp???)) are installed dry and replaced often. And by the way to cut costs our shop gets a tool budget and we buy our own tools (wich we could take them home, but we cant) uasally snap-on or craftsman. And finally "AN" use to stand for army-navy but they changed it to mean Air Force-navy.