are they straight thread? , therefore they go in till the shoulder seats

or are they pipe thread, and only screw in till they are tight (possibly leaving some threads visible?

 

Should go to the shoulder. You might need to wirebrush out the hole/bung/threads and use anti-seize lubricant only on the threads

 

Go to the shoulder. There should be a crush gasket on it like a sparkplug.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ILcrxsi1 &raquo;</TD></TR><TR><TD CLASS="quote">Go to the shoulder. There should be a crush gasket on it like a sparkplug.</TD></TR></TABLE>

Yup. And use liberal amount of anti seize

 

thanks guys
I was afraid of that


The threads on my header must have been screwed (haha)

I put a sensor in it and it threaded in but got tight b4 it seated. I was told it should go to the shoulder so I torqued it in.

Now that I am replacing it, I cant get it out.

I have broken one o2 socket on it and it still isnt moving.

I have been soaking it with deep creep for 24hrs and I am going to be driving the car monday, with of without a sensor. I would much prefer it be with a sensor.

what can I try to get this out?

 

Sounds like you cross threaded it to me.....good luck

 

yeah I know.

It would be a 1st if I did, but I cant say I didnt.

Anyone have help for removing a possibly Xthreaded o2 sensor?

 

the threads were probably messed up, happens all the time since it gets so hot.

Use an oxy/acetylene torch, with the header/manifold either off the car, or stuff moved around for plenty of room to get to it.

 

I got it out!!!!!

I took a nap
then I turned it back in the slightest bit b4 trying. and it came out like exlax
I even had spun it the last bit.


the only bunged threads are at the shoulder, not at the sensor end.
should I buy a tap b4 I stick a sensor back in?

 

I wonder how much an M18 tap would cost

 

BUT!!!


after swapping the wires
I start to thread the new sensors in and it stops after about 2-3 turns

I guess the header mfgr left some slag in the threads

now to look for a tap, and drive to the store with a hole in my header

such fun

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gibsanez &raquo;</TD></TR><TR><TD CLASS="quote">I wonder how much an M18 tap would cost </TD></TR></TABLE>

http://www.google.com/products...hl=en

 

Well I had no local source for that tap so I decided to go ahead with installing the new sensor.

This time it screwed in much easier, it did not tread to the shoulder by hand like a spark plug, but it was not very stiff. I got it to crush the washer w/o undue effort.
I think the new threads in the header needed to be cleaned.
Well, I guess 3 O2 sensors will have them cleaned.


Just curious, will the spark plug thread tools work for this?

 

I have a tool that was my dad's. I think it was made by snapon and one end has a thread chaser for spark plug holes and the other end is a thread chaser for o2 sensor bungs. It is really handy, because I had the same problem with the threads on a used DC header I picked up (I had to use a pipe wrench and an acetelyne torch to get it out) and have always chased the threads before putting in a new sensor.