Removing a stuck steel bolt from an aluminum engine block requires patience and skill. Aluminum engine blocks can easily be rendered useless through reckless attempts to remove stuck bolts. A steel bolt gets stuck after some time because it has fused with the aluminum block through galvanic action. Although this happens slowly and at a very small scale, it is enough over a period of time to seize the bolt permanently. Remember that in performing the extraction procedure, you have to exercise a lot of patience so as not to induce further damage to the aluminum engine block.
Apply penetrating oil around the stuck bolt. You want the area soaked so use plenty of oil. Allow several hours for the oil to work itself into the threads of the bolt.
Fit the locking pliers very tightly around the remaining part of the bolt and apply counterclockwise pressure on the bolt to unscrew it. Sometimes, it helps to give the pliers a sharp rap with a hammer in the direction you want it to turn to jar the bolt loose.
Heat the steel bolt (with the propane torch), not the aluminum, until it starts to glow. While heating the bolt, tap on it to help break the fused area. Wait 15 minutes and then reattach the locking pliers again. Try turning the bolt again in a counterclockwise direction. In some cases, it helps to try to turn the bolt in a clockwise direction before applying a counterclockwise force. This procedure does not always work on the first try. Repeat this step up to 4 times to try to get the bolt out.
