Pulled the donor motor out, bolted it on the stand, went to remove old motor mounts and one of the bolt heads twisted right off.... So, I drilled a pilot hole through it, then went with a bigger drill bit and guess what... it broke. Ok, I won't get into all the details, but now the hole is the same diameter as the bolt, but I can't get any deeper than the broken bit (about 3/8"), now I don't know what I should do... Is there a bit that will drill through the broken bit? I'm open to suggestions. Mike Too late for the should've's - nobody's kickin my a$$ harder than me
get a small chisel or punch ,and just shatter the rest of the old bit out. use saftey glases or shield and smack it it should break up as far as the hole being to big no problem use a helicoil when you get the old one out,
Got a buddy of mine removes them all the time. all you have to do is go to a welding supply house and ask for welding rod that removes broken bolts out.than what you do is get a big nut and lay on top of the hole.Fill up the hole with the rod. It will take about two or three rods to fill the hole and the nut flush.(Sounds like b.s right) What happens is that as you are filling the holeup you are coating the threads with the flux. When you fill it to the top than you wait.As the red starts to fade away you slowly start turn the nut.remember lefty loosy righty tighty. you get the piont. the bolt will start to move Back and forth you get the picture.I seen it done if it breaks off than you repeat and it will come out.My buddy pulled three head bolts of a block before you can finish a six pac.Hope this helps.
Sometimes you can fish a drill bit out with needle nose pliers; try to turn it backwards and then forward. If that fails, use the punch; it should be hard enough to break.
Sometimes you can fish a drill bit out with needle nose pliers; try to turn it backwards and then forward. If that fails, use the punch; it should be hard enough to break.
a masonary drill bit will work to drill through another bit or extractor it is hard on the bit and work last long but it is a last resort sometimes these bits are super tuff I used one to drill through a broken extractor. welding a nut on top also works well
For a first time poster, you gonna be handy to have around. I'll file this advice for future use. No go introduce yourself proper like in the right forum per the rules.
I couldn't post this until today since it was bookmarked on my computer at work. This site has some good pics showing how to remove broken off bolts. http://www.geocities.com/jim_mason_49913/brokenstuds.html Slonaker
Can I heat it up with a torch then blast it out with the O2 once it's cherry red? Will that hurt the block?
Dude, just weld a nut to it and back it out with a socket or wrench. It don't get no easier. It's a 5 minute fix with a 110 MIG. JH
I snapped off a head bolt on my old flathead... and it was one that went into the water jacket... and I too busted off a drill bit in it. I used a torch to blow it out... It worked fine... just have a steady hand. I ran a tap through it a couple times once it was cleared out and it worked out fine. Man... I'm glad I dont have to deal with that one... sorry.
Well I can't get any deeper with any drill bits I have... do I need a special kind of bit? I've tried ***anium and cobalt. Do I need to get a carbide bit maybe? This really ****s ***
Try and build weld up on the end of the bolt. Build it up until you have a big blob of weld sticking out of the hole. Grab the still glowing (dull red) blob with vise grips and try and get it to turn, a little bit each way at first then more and more until it comes out. You might have to make many attempts. The mig will not want to stick to the block. The heat/cool action will loosen the bolt stub. It might be worth turning the block over so the hole is vertical so the weld will puddle in the hole. You want a powerful mig welder on full power. I've done this a few times and if you keep trying it never fails. Further note: It might be possible to trim 1/8" or so off that boss to make the bolt less shrouded. There should still be plenty of thread depth for it to work. The lost metal could be made up with a thick washer. Mart.
I was in a machine shop yesterday and noticed a head with 3 broken bolts in it. I asked the guy how he does it when he gets this stuff in. He welds on it just like mentioned before but said he does about 6 or so a day. If you are not confident in doing this you should ask the local machine shop to do it and I bet it wont cost that much. Yours looks like a fun one to me so this is what I would do. Just my .02 cents Bob
You can burn it out with a torch.The cast iron of the block will dissapate the heat much faster than the bolt will.Use lots of heat to get most of the heat in the bolt.burn the center out first and work out.Clean it up with a tap.This works I've done it.And doesn't hurt the block.
[quote='29MurrayTub]You had me worried. I thought it was a movie about two mechanics... Whew![/quote] hahahaha
Well I learned a few new tricks today I well have to try next time, but I well add another that I use on broken exhaust manifold bolts for Ford FE motors (they always break) I use my dremmel tool and a cobalt reamer type bit (has the groves cut down the length of the shaft) I drill all the way through the bolt then work in a circular motion from the center out until I have ground all the bolt except the treads out, at this piont I start retapping the hole slowly (or you well break the tap) screw it in alittle then back it out and clean out the hole, keep repeating until its good as new, works every time!! One caution though, always were gloves and safety gl***'s as those small filings really hurt and stick everywhere. edsel
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