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Question DetailsAsked on 3/3/2017

,i need a bolt removed it has been stripped and drilled . How do I get it out? It is on the head.

This is on an1998 Acura CL

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2 Answers



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Answered 3 years ago by Member Services


If you have an inch or maybe a bit more sticking out still, a bolt extractor is the tool - one type fits over the bolt like a socket and grips it with internal spiral cutting edges as you turn it out with a socket wrench, another type has a hole through it and a cam that grabs the bolt from the outside and pinches it tight and you turn it out with a socket wrench handle. Both types available at tool and auto supply stores - some auto parts stores rent or loan tools like that too if you buy the replacement parts for the repair form them.


Many times, if enough bolt is sticking out, rethreading with a die and double-nutting the bolt to turn it out, or welding a new nut on the bolt and turning it out with that works well.


If already drilled out, then using a left-handed thread drill bit to extract it is likely out of the question, so that leaves an internal tap-type bolt remover or "easy-out" - come both square (meaning hole in bolt can't be near to full diameter of thread or it will ruin the threads in the block) that you drive in tight and then turn to remove the bolt, and also comes threaded like a tap which you turn in counterclockwise and it grips the inside of the bolt and turns it out.


With all those, a good day or more soak with a penetrating oil will certainly help the situation.


If those fail, you can try chilling the bolt with canned air or refrigerant injected into the drillhole - though there is the risk of brittle fracture doing that, so it is nearing a last resort. Heating the heat also works, but getting it hot enough to make a significant difference without scorching gaskets and adjacent wires and hoses and fuel lines is tough on modern vehicles if you cannot remove the head to a workbench.


Last normal resort - drill the bolt out entirely (of course, means hole has to be pretty well centered, and use a helicoil insert to replace the threads and to hold the new bolt. Of course you have to be careful not to drill too deep and go through into an oil or coolant passage or thin spot, and works well in cast iron and steel but tends to split aluminum.


Last, last resort - torching it out with a microtip removal torch (designed to go down into a hole to torch out a bolt without melting the tip in the process) - then helicoil for the fix. All the above tools you can look at on Amazon or other tool site - search for bolt removers and easy-outs.


Obviously, all these incur at least some risk of damaging the head - so taking it to a professional automotive shop might be your best bet overall - probably about $100-250 charge depending on local labor costs and how resistant it is - plus maybe about $50-100 towing charge if car is not driveable. Or if head is off vehicle, take to a performance or custom auto shop to have them remove and replace the bolt.

Part of that decision would depend on whether you are up to replacing a head if you damage it or not, and what a new (or used if up for that) head costs couple to few hundred for the head, $1400 it looks like for a new cylinder block if into that.

Answered 3 years ago by LCD

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