Drilling absent bolts in a vehicle's cylinder belief should one be done as a behind resort. It should peerless be done whether the bolts keep be remodelled so full of years and rusted that they won't come elsewhere any other road. The bolt tendency should retain broken off anterior before you should yet envisage it, and then, any attempts with pliers or other gripping tools should be mythical. Be careful not to damage any branch of the cylinder head.
Instructions
1. Choose the right size drill bit to use with your drill. Use one with a smaller circumference than the bolt you are removing, if only by a little, so you won't damage the interior threads on the cylinder. Use a drill and bits that can allow you to drill in reverse direction if possible.
2. Punch a hole into the bolt head (however much is left of it) using a center punch and hammer. This will help you position and balance the drill bit so it travels straight down without swiveling to one side.
3. Drill a little bit at a time, apply more lubricant to the hole to keep the drill bit from dulling. Whenever you remove the drill bit, use a magnetic wand or similar tool to clean metallic shavings out of the hole.6. Stop drilling and remove the bit should you drill all the way through the bolt without removing it.
If not, remove the bit, apply more lubricant and insert a socket-type bolt extractor into the hole you drilled. Twist the extractor carefully to avoid breaking it.
5. Continue drilling if the extractor won't work. Apply a penetrating lubricant such as WD-40 to the bolt so it penetrates down into the threads to break through the rust and loosen the bolt. If there is enough of the bolt protruding out, you can try using a vise-grip extractor tool to remove the bolt without drilling.4. Position the drill with a reverse-action bit onto the bolt and drill into it by about 3/4 of an inch; this might force the bolt out by itself.
If it comes to this, you must try to drill repeatedly from different positions with the intent of completely grinding up the remnants of the bolt.
