I need this thing working.

7 of the exhaust studs are the normal 13mm wrench variety, but there's ONE that isnt teh 13mm one, nor any other nut I have ever seen.

is there any OTHER *stock* (doesn't look stock though) choice for nuts?

i mean could the guy have stepped down from a M8 to a M6 or something?

actually i think its smaller than a M6, not for sure, just my gut feeling. I almost want to try a clutch cable nut to see if that will cinch down.

b

Try a 12mm.

Japanese cars use an M8 nut that is a 12mm on the outside.


They believe 13mm is unlucky.

it looks smaller than the M8 though, which prompted my search for the stud *smaller* than M8, which would be M6?

I can't imagine what happened there, maybe some threaded insert or helicoil to go from M8 to M6 or something to that nature?

b

like clay, I'm referring to the stud itself...I had both 12mm outside and 13mm outside nuts on my old engine, but they were all M8 on the inside....


b

So it still looks like a nut (6 sided) yet no socket fits it? Try 10-14mm and 7/16-9/16.. then try whitworth.

If the stud is undersized, then you need to extract it and replace it.

I just weld an old nut onto the effed up stud and let it cool. then I unscrew it and replace it.

Ooh, could be M7.. that'd be unusual though. Clutch cable nuts are M7 I think. Could also be 1/4-20 or 1/4-28. Both of those would be seriously DAPO.

Beat me to it. Actually, after restoring a few brit vehicles, whitworth was the first theing that came into my mind.

Zach

sockets arent teh problem. Also wouldnt be a problem if I already had a nut to go along with this stud. But I'll try to get some M7 nuts and some M6 ones and go to town tomorrow.

b

why not just buy the right stud (and dont you have some core heads there?) and put an OE stud in.....