1993 240sx: how do you remove catalytic converter?

[surreybc]

I'm concerned about the front bolts with 17 mm heads. they go through a hanger and pipe flange and cat flange. I assume only the cat flange is threaded? I assume most replacement cats are not threaded?? thanks


the two downstream bolt/nuts seem to have 14mm heads and nut with pitch of 1.25. I had no problem getting these off.

[STLCoupeStar]

take a plow torch heat up the bolts, did work for me so i used a grinder....or are you asking about the bolt side?

[surreybc]

take a plow torch heat up the bolts, did work for me so i used a grinder....or are you asking about the bolt side?

the end of cat closest to engine. I assume there is no nut. just wondering what is threaded to hold bolt in place. I might just try to break the bolt if it is only threaded into cat which im replacing.

[!Zar!]

Both bolts thread into the cat.

They rust/seize all the time.

Just keep loosening it till it snaps/breaks.

[projectRDM]

They will break, guaranteed. Be prepared for it.

[soreballz]

Soak the living shit out of the bolts with a 1-2 punch of CRC Freeze Off combined with PB Blaster. That's always worked well for me.