Open 12pt Wrench to Access Header Bolt?

Do they make an open 12pt wrench to access header bolts? I don't mean a regular wrench, where one end is 12pt and the other is open (hex). I mean the open side had the 12pt profile...imagine cutting the 12pt closed end of a wrench in 1/2 so you can slide it over a bolt.

I have a header bolt that is backing out and it's on the inside bend of the one of the header tube. I can't get a regular 3/8 socket or wrench over it. In fact, I don't even know how my installer ever install the bolt in the first place, b/c the bend in the header is so tight.

Tell me they make this before I hack up a tool to make it myself.

yes they do its called a line wrench... i think thats what your talking about.

But I know the trouble you are having. I use a small ignition wrench that is 12pt closed on one side. I just ground it down a bit on the bench grinder to thin the walls. Fits perfect.

a line wrench is not a 12 point type. might try denting the header in just a little on that primary to give you a little more room. might effect your flow a little bit but better than a exhaust leak.

a line wrench is not a 12 point type. might try denting the header in just a little on that primary to give you a little more room. might effect your flow a little bit but better than a exhaust leak.


Guess I should hide the 12 pt line wrench set I have in my truck.
;) Maybe you cant get them from Sears but I have a Snap-On set that is 12 pt.

Denting in the primary may also help but a small ignition wrench works very well.

I ended up grinding down the closed end of a 3/8 wrench. Not quite to half, but may 150 degree open...almost like a tiny spanner wrench. I also end up beveling the ends as well..hard to explain, once I have a picture, I'll post it.

For my case, it was a loose header bolt at the worst spot, where the bolt is right at the inside bend of the header.

Anywhoo..after some grinding on the grinding wheel and some manual filing...I have a great tool...well, great for just 1 damn application.

Snapon makes them. It's called a flarenut crowsfoot. We in the aviation industry use them all the time for torquing b-nuts on tubing and hoses.


http://buy1.snapon.com/catalog/item.asp?P65=&tool=all&item_ID=1213&group_ID=147&store=snapon-store&dir=catalog

I used my gear wrench, worked fine.