Turbo oil feed line repair

[WaltM]

Hello all;

I have an oil leak where the turbo housing connects to the fitting, that connects to the oil intake line.

The line was repaired once before, but I don't think the guy that did it was paying attention. The fitting that screws into the turbo isn't oriented in the most "cooperative" angle and the male fitting that screws into the turbo fitting should be replaced.

What I'd like to do is replace the spliced hard line w/a short piece (about 8")of steel braded tubing and install a new fitting on the turbo housing.

Can anyone tell me what size line and fitting/thread size I would need to accomplish this?

Thanks

[NavySVO]

IIRC, it's 1/8" NPT. Like I said....... IIRC.

[SVOeric]

I'd throw it away, and buy a new one. Motion dynamics has both hard, and flexible lines. I have their flexible line on my 1E, and the hard one on my 1C, and to be honest, I think I prefer the hard-line.

[WaltM]

IIRC, it's 1/8" NPT. Like I said....... IIRC.

IIRC

[NavySVO]

IIRC

IIRC = If I Remember Correctly

[WaltM]

IIRC = If I Remember Correctly

Thanks. I guess I learn something new everyday !

[mutant]

Can anyone tell me what size line and fitting/thread size I would need to accomplish this?

I just measured an oil feed line, part # E4ZZ-9G440-A
The threads are 24 threads per inch. From my reference book, 1/8 NPT is 27 threads per inch. The diameter is a little strange, it does not fit any of the holes in my thread gauge set really well.
I don't know about the threads on the turbo housing itself....

[WaltM]

I just measured an oil feed line, part # E4ZZ-9G440-A
The threads are 24 threads per inch. From my reference book, 1/8 NPT is 27 threads per inch. The diameter is a little strange, it does not fit any of the holes in my thread gauge set really well.
I don't know about the threads on the turbo housing itself....

That is pretty wierd. If it's not 1/8 NPT, then what is it?

[WaltM]

...to be honest, I think I prefer the hard-line.

Why is that? Just preference? Or is it an engineering thing?

[WaltM]

It's not a pipe thread - it's a tube nut, which is a standard SAE thread. In this case, 3/8-24. Just like brake lines. Pipe threads are intended to provide sealing on the threads - tube nuts don't seal on the threads - they seal on the flare of the tuibe.

The 90-degree brass adapter that threads into the CHRA top has a 1/8 NPT on the male end, and it has a standard inverted flare tube fitting, 3/8-24 female, on the other end. Just go to a hardware store and get another one. Look for an internal hole size of at least 0.125".)

Thanks Mike. You da man! This answers many questions.

Most likely, from your description, the inverted flare inside the 90-degreee fitting has been over-compressed and needs to be replaced. Then when you properly align the tube end, and tighten it you'll feel it "crush" and that is what forms the seal.

The fitting at the turbo housing is probably weak. I guess that's why the it seats past the point of 90 degrees and I needed to "hook" the end of my oil line so I could connect the two. But how does tightening the tube end secure the fitting that's screwed into the housing? I can't visualize it.

[WaltM]

I use a lap of teflon tape on the pipe threads - some turbo rebuilders say not to.

I was "advised" to use permatex high-temp thread sealer (the red stuff) on the fittings. Does it provide the same sealing result as teflon tape?

[WaltM]

I was "advised" to use permatex high-temp thread sealer (the red stuff) on the fittings. Does it provide the same sealing result as teflon tape?

Note that Loctite [and others] makes a very large assortment of stuff and to ID them just by color isn't very specific.

This is the product that I was told to use...

http://www.permatex.com/products/automotive/thread_compounds/a_thread_sealants/auto_Permatex_High_Temperature_Thread_Sealant.htm

[NY eric]

Honestly walt that stuff will go up in smoke the first heat cycle. If the fittings are good you wont need it. If not then replace the fittings. I pesonally like the hard line (no jokes please). The flexible braided lines are ok too it is just my preference.

[WaltM]

Eric:

I'm frustrated. This is the second time that the leak occured. I just want to be done w/it. I'm a big fan of getting things done right the first time; so I don't have to take it back to a garage, or tear it apart again.

If you know what I mean...