dfinnegan

I've removed an oxygen sensor from my catalytic converter and some thread material was left behind in the cat. I need to clean out the threads and need to know what the thread is so that I can get a proper tap or have a machine shop do it for me.

Any one know what the thread is for the oxygen sensor tap in the catalytic converter?

Thanks,
Dave

Indycam

Hiye dfinnegan
18mm x 1.5. ?
Big spark plug tap size ?

Check it before you trust me . I don't know for sure .

dfinnegan

Yeah, that's what I figured, too, but I don't have any way to check it.

Any other thoughts from anyone out there?

dfinnegan

By the way, what does the 1.5 represent? Is this the number of mm per thread?

Indycam

Hiya Dfinnegan
"Yeah, that's what I figured, too, but I don't have any way to check it"
I'll check when I get home . Report back to ya tues .

"By the way, what does the 1.5 represent? Is this the number of mm per thread?"
Number of threads per mm , I think .

dfinnegan

Indycam,

Thanks. I have the catalytic converter out to a machine shop; a connection through my father-in-law. We expect they'll be able to clean up the threads. I'll let you know how it goes.

Thanks for your input.

Cheers,
Dave

dfinnegan

The threads are 18 x 1.5

Thanks the input,
Dave

darth

Wouldn't they also be a pipe thread where there is a slight taper in order to achieve a seal?

Bill
90C2

dfinnegan

Bill,

I'm not sure if they are a pipe thread, or not. My father-in-law brought the cat to a machine shop while I was away on business. I think he mentioned that the threads were tapered, but he also mentioned the tap running smoothly through the threads once the bit of stuck material cracked free leading me to believe they were straight threads.

I'll check with him later and post back when I learn.

Cheers,
Dave