Hi all,

Ive been trying to remove my passenger side exhaust manifold so that i can helicoil the head. Problem is that i have one last nut connecting the manifold to the crossover that I cannot break loose. I've been soaking it with kroil for the last week and trying to wrench on it. Even with an impact wrench I cant get this thing to break loose. Im running out of ideas, you guys got any?

 

Breaker bar, long pipe, and a fat guy. snap that thing off so you can get a pipe wrench(monkey wrench) on the stud, and start praying that doesn't break in the head or you'll be doing more than one coil and some drilling too.

 

Dremel tool to gently score the nut and open it with a chisel? A nut splitter may work too. Then clean up the threads with a thread chaser.

 

The nut is not located on the head, its holds the crossover pipe to the manifold. So if the stud snaps I wouldnt care too much because i would be able to take the whole manifold out and drill the stud out. Also I tried a breaker bar first and I sheared my swivel. I should say that the way Im getting to this nut is with a swivel and about two feet of extensions.

 

Good idea rworegon. Im considering that one, if i can get the dremmel on it

 

I had the same problem, even PB Blaster wouldn't break them loose. Ended up just snapping 2 of the 3 bolts with a long breaker bar. They should be replaced anyway.

 

Acetylene?

 

Ya I might end up doing that if i cant chissel it off.

 

Put a half inch drive breaker bar and extensions and slide either slide a small pipe over the end or use the closed end of a big wrench to give more leverage. The bolt will either loosen or break.

 

Thats how i got the two top ones off but the bottom one wont budge, I ended up shearing my swivel instead. My impact wrench wont even get it off.

 

If you can't get the leverage, or heat it, or use a spliter/chisle. The only other option is a tougher swivel(beefy impact gun type). There might be something 'm overlooking, like the spliter cause I can't ever get those in where I need em.

 

I'd be easy on using a giant breaker bar. There's no guaranty that what you break will just be the stud.

I had to remove the manifold and downpipe together, and once I had it on the driveway ground the nut off with an angle grinder. That left the stud, which cleaned up well enough with just a wire brush. You may not be able to do this with the manifold/crossover, in which case the dremel tool route is the way to go.

 

heat that sucker up it always works for me.

using a swivel with an impact pretty much eats up the torque of your gun
(swivel absorbs the impact)

 

With the 2 extensions and the swivel your getting to much twisting on everything but the nut.

That and the fact it is so hard to even reach up in that area

 

Hey guys thanks for all the suggestions. I ended up getting an impact chisel on the thing. Stud needs to be replaced but thats fine. I think i'll use some anti-sieze when i put it all back together.

 

Remember that threaded connection is VERY hot in operation. "Ordinary" anti-sieze will just burn away. There is a sort of anti-sieze used on O2 sensors (I think it's glass balls in grease; the grease burns away). YMMV.