Exhaust manifold removal

[Timber Crasher]

I just broke an ear on my drivers side exhaust manifold.
Is there any thing I should know ,prior to removal,that will help prevent snapping off the bolts? Should the manifold be hot?
I'am soaking the bolts with some penetrating spray.
The rig is a 1972 Scout 2 ,304 or 345,4 speed,4x4,center dump manifold.
Any advice would be appreciated. Thanks,gary

 

[Robert Kenney]

Assuming you didn't break the ear off while loosening the bolts you're on the right track with penetrating oil. I don't think heat at a safe level will help...

So the bolts git jammed by rust because the rust actually occupies more space then the metal it was made from.. Natures locktite.

for me a few hard taps/raps on the bolt head with a hammer in a direction like you were driving a nail will help loosen the rust and the grip it has on the bolt. Thats the best I can suggest other than patience with the penetrating oil.

 

[Timber Crasher]

Yes, I ran up the nut with an air wrench and broke the ear like an idiot. I'm paying for it now waiting 2 days for the part.
I appreciate the advice. I'll keep spraying the penetrating stuff and frequently hard tap like you say for a couple days.
Thanks, gary