Air rail plug pics

[CUMAPART]

I've never used or seen the OEM plugs in any head. Most have the brass 1/4" NPT brass plug with the allen head. I take it the OEM ones are steel. I have also seen the threaded inserts from the OEM air rail welded up and if done right it looks pretty clean and seals nicely.

 

[DAD2SIX]

I will add what i just did to this old thread.
I cut my stock air rail adapters and welded them up and ground them flat. Took 15 min and was free.

 

[Mace]

You realize that you welded the wrong end of the injection ports shut???
The shoulder is needed if you do not use a tapered thread plug.

 

[DAD2SIX]

I do now......... Sob

 

[FJ40Jim]

And the hex makes it so the plug can't go down into the hole and hit the bottom to seal.
That's why it needs to be an allen.

<cue sad trombone>

 

[DAD2SIX]

I don't always f-up but when I do I make sure to do it in front of everyone. What a bone head mistake. Lol

 

[FJ40Jim]

Here, have a and a . Then get some allen head plugs and screw in there.

Things aren't so bad after all.

 

[huminajumina]

I had hex brass plugs lying around, so I ground all the hex head off & put a slot in the top so I could use a screwdriver to thread them in, it was free. You can do that with yours if you want to save it. You will probably never get them back out, but you will probably never be reinstalling an air rail.

 

[DAD2SIX]

I couldn't no go out like that. Here is my V2.0 air rail plugs. I had some Allen head bolts on the shelf and they slid right in. I let them stick out a little bit then welded up the gap. Then ground them down. Redemption!....... Still funny tho

 

[Mace]

lol,

 

[Curtice]

Thread back from the dead. How tight to torque the plugs? Thanks.

 

[FJ40Jim]

They don't need to be super tight. They aren't mechanically loaded and will rust in place quickly.

 

[Curtice]

Thank you!

 

[largeone]

I have one brass plug toward the back of my engine that is leaking slightly. What effect does this have on the engine? I think a P.O. Used the NPT 1/4” plugs. The rest of the plugs are holding fine.

 

[FJ40Jim]

Zero effect on how the engine runs. The plugs are downstream of the combustion process.

A large enough exhaust leak underhood would be a noise source and a CO danger.

 

[Pskhaat]

Folks, how does a stock 3FE just simply without AI. Other than regaining the marginal power to spin the air pump, and to reduce and dilute the exhaust a bit, what ill/good effects are there on system removal? Do the O₂ sensors see a richer exhaust with less oxygen and make poor fuel system judgement then?

 

[FJ40Jim]

Runs fine. The O2 sensors see a more accurate exhaust gas and the engine runs closer to the ideal 14.7. These are narrowband sensors, so they can't read an AFR of 16 due to AI, and then compensate down to 14.7