My flywheel bolts are refusing to come out, well 2 of them anyway. My cheap 230lb/ft impact gun wouldn't do it, so I tried by hand, got over 200nm on them but nothing. I couldn't get anymore on it without the socket slipping so don't want to keep trying that. So I bought a 700lb/ft impact gun aaaand nothing, won't do it. I've only got a small compressor so probably not getting the max out the gun but still, this is ridiculous! The gun says 90psi max and my compressor does 100 so it shouldn't be too bad. I've tried tightening them with the gun first, nothing, tried putting all the other bolts back in really tight, nothing.

 

I'm completely out of ideas and it's doing my nut in! I don't really know what to try next? And all this while the heads are getting more and more chewed up. I've got an oxy-acetelene welder but figured I shouldn't heat this up.

 

Anyone got any bright ideas? I'm at the end of my tether!

I've always shocked bolts off, ring ended spanner and a mallet.

I ended up grinding the heads off to get the flywheel off, then the studs came out easily with no pressure on them. Nicked the flywheel more than I would have liked but having looked at it now it's off the car I think it needs replacing anyway so it doesn't matter, there's heat marks on the back of it!

Ahhh to late to post a remedy...lots of localised heat on the bolt heads (mapp gas bottle) would of released the thread lock. The grinding would of done the same to them hence them just coming out with no heads.

I did wonder about heating them with a torch but wasn't sure it was a good idea on the end of the crank. I did try and get the second out with the gun again after grinding off the first, they were right next to each other so thought it might have got hot enough, but no.