I've extracted many broken off bolts. I start by giving the bolt a good (or many) hard impact (punch or large drift). This often helps loosen the threads. Then I carefully center drill the bolt, and drill all the way through the broken bolt until I feel the drill bit hit the cavity at the bottom. A sharp drill, plenty of oil and patience are necessary, as well as exact center. I start smaller and work up to reasonable size for an easy out. Careful use of the easy out and know when to back off before it breaks. If easy out doesn't work (and most times they don't), then I drill out a bit larger, take a cut down hacksaw blade ( I cut them lengthwise with aviation tin snips) and make 3 cuts from the center outwards into the threads. After this, I use a center punch, or a specially ground smaller punch to act as a mini chisel and drive towards the center. This almost always causes the threads to break loose, then the 3 pieces can be extracted. It all takes much patience. In most of my cases they were 10MM diesel exhaust manifold bolts, and it saved having to pull the head. This would probably be best with the engine pulled out. Dennis
1991 LS Trooper 2.8 V6 5 speed conversion (Sold)
1989 LS Spacecab 2.6 5 speed 4x4 manual hubs, Rodeo torsion bars, extended shackles, 2" lift, K&N airfilter (drop in), dump bed conversion, burgundy interior change, warn brush bar.
Previously owned: 1987 Trooper II LS, 1989 Trooper (parts only), 1994 Trooper 3.2 Auto, 1997 Rodeo 2.6 5 speed, 1993 shortbed pickup 2.3 (project - sold) 1992 Rodeo 4x4 LS (parts car, devoured by Spacecab needs) plus some 70 plus other non Isuzu vehicles over the years.http://forum.planetisuzoo.com/viewtopic.php?f=15&t=64060
The American dream is getting farther and farther away from the American.
If your wife has 5.00, and you have 20.00, your wife has...25.00
"Water is one of the greatest essentials of life. Without water, you can't make coffee."