Heli-Coil Cooler line

It's a pipe thread...........Dont know if helicoils come in pipe threads.

^^^ Mr Google says you can, as long as you use tapered helicoils

... although it might require some sealant of some sort, depending on how tight the coils on the helicoil fit together

I have only been told its an inverted flare, not pipe.

Can somebody tell me for sure that its either 1/8 NPT or 1/4-18 NPT or 1/2-20 NF Inverted.

DeathRattle said:

I have only been told its an inverted flare, not pipe.

Can somebody tell me for sure that its either 1/8 NPT or 1/4-18 NPT or 1/2-20 NF Inverted.

Click to expand...

Look at your fitting. Is it a flare fitting on the end of the line that actually screws into the trans, or is there another adapter fitting into the trans.

Pipe size is generally about half the actual dimensions.

e.g. 1/4 inch pipe is about 1/2 inch diameter

1/4 inch pipe thread looks a lot like 1/2 inv. flare.

Each of the two ports, in and out, will be the same size. Look at the other one that is not stripped.

I dont have old fitting. Its a core from a 1981 something. I have been told its a flare and I have been told its a pipe. I just want to find out if anyone knew for sure which one it was. If I have to take trans back out and disassemble it again ill either drill bigger with hex or face bushing or helicoil. Bushings will be cheaper but helicoil will be stronger.

Checked TCI website and they say TH350 takes 1/8 pipe. And that is way off. 1/4 pipe tap fits. I guess I might as well try it. I wont go to far as I dont want to dump a ton of shavings into trans. I will pack the flutes with ice cold moly lube to trap the shavings.