teflon?
 

can i use teflon on the threads for my oil lines?

I suppose you could but I don't see a reason. All the oil lines I've seen use a cone type seal. If oil leaks by that it will leak out regardless of the teflon tape. If you are sealing a tapered fitting like a pressure switch then teflon is a good idea.

-Andy

If they are AN fittings, I don't use anything as the AN fitting itself has a beveled edge that handles this. If the part is NPT ( pipe thread) then yes, I would.....

I would not use the tape on threads for engine oil fittings. Use the liquid. You don't want any pieces of tape migrating into the lube system.

+1 for engguy's reply.

Never use thread tape on hydraulic / lubricating oil systems. The migration of a small piece(s) of tape can cause major problems. Use a suitable liquid thead sealer. e.g. Locktite White.

thanks for saving me from destroying my motor

+2 on that. Loctite(Permatex) actually came out with a new hydraulic fitting type sealant that's purple and it works the nuts at sealing even the worst pipe thread type seals as well. I can't remember the actual manf number(ie 252, 272, etc) but I know it's a purple goo, like grape jelly. Stuff is supposed to work well on fittings that are not perfectly clean either, but I've never tried that myself.

+2 or +3 on teflon tape.

Loctite (at least it used to be) PST on tapered threads (pipe threads). Apply anti-seize on AN threads and sealing surfaces to reduce/prevent galling and corrosion.

Sherwood

I assume the oil line fittings, the ones that have the cone shape, are AN/JIC 37 degree type. These seal on the cone surfaces. If there are debris, scratches or nicks on either surface there could be leaks. As mentioned above re. galling.. you want to counter hold the fitting while tightening. JIC fittings have their pros and cons.

There are no AN parts in a stock 911 engine.

The fitting to the case in an early engine is a pipe thread to a straight thread which uses a flare coupling on one end and a banjo fitting on the other end. In the later engine it's a straight thread to a straight thread in the case and the same flare and banjo combo.

I'm talking about the big oil line coupling on the right side of the engine... isn't that a JIC/AN fitting?

No, it's a metric male straight to male straight. Why would the Germans use Army-Navy? :)

John, good point....I thought I remember a cone type feature in there and assumed JIC or AN. I remember reading I think as you point out that JIC grew from US Army/Navy. Then AN is sort of a slightly down graded version, with some lower specs. but should be able to be hooked together in most cases. Right? I think I'm talking about 37 degree JIC/AN.. there could be other angles.