Extracting broken head bolts? - Snowblower Forum : Snow Blower Forums
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post #1 of 33 Old 02-21-2015, 10:19 PM Thread Starter
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Extracting broken head bolts?

The Tecumseh engine on my old Ariens has 2 cylinder head bolts that broke off in the block. I tried using a Ryobi screw extractor set, but all it seems to do is roll the threads on the extractor, and spin as soon as I start getting any bite into the bolt with them.
Any other ideas, besides drilling the bolts out an re-tapping the threads?

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post #2 of 33 Old 02-21-2015, 10:43 PM
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Most people will stick a washer and nut over the broken piece and then mig weld the inside of the nut to the broken stud. The nut will give you a new head to unscrew and the heat should break the rust bond. I just got a cheap Harbor Freight welder and am not very good with it and have never tried that.

Have you removed the head? Is there enough of the bolt sticking out to get a pipe wench on it or is it flush or under the block?

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post #3 of 33 Old 02-21-2015, 11:09 PM
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Quote:
Originally Posted by caddydaddy View Post
The Tecumseh engine on my old Ariens has 2 cylinder head bolts that broke off in the block. I tried using a Ryobi screw extractor set, but all it seems to do is roll the threads on the extractor, and spin as soon as I start getting any bite into the bolt with them.
Any other ideas, besides drilling the bolts out an re-tapping the threads?
did you remove the complete head ? remove the head and hopefully there should be a nub of the bolt sticking up. grab it with VISE GRIPS and turn it out.




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post #4 of 33 Old 02-21-2015, 11:15 PM Thread Starter
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Originally Posted by Shryp View Post
Most people will stick a washer and nut over the broken piece and then mig weld the inside of the nut to the broken stud. The nut will give you a new head to unscrew and the heat should break the rust bond. I just got a cheap Harbor Freight welder and am not very good with it and have never tried that.

Have you removed the head? Is there enough of the bolt sticking out to get a pipe wench on it or is it flush or under the block?
The head is off. 1 bolt is just under the block deck, the other is barely above it. I did try vise grips on 1 of them, but it didn't budge. I ended up rounding the stub down with them. Now that I've drilled the bolt centers to fit the extractors, the sidewalls aren't thick enough to try vise grips anymore.
I don't have a welder, so I'm not sure what else to try at this point!

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post #5 of 33 Old 02-21-2015, 11:20 PM
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A pipe wrench should grab better than vice grips. Kind of a mute point now I suppose. Can you heat the block with a propane / MAPP torch? That might loosen the corrosion holding on to the studs. Not sure if you have and gaskets / metal / plastic / rubber to deal with. A hammer can work too. Take a flat punch and strike straight down on the studs. The shock can loosen the bond holding them in. You just have to be careful not to expand them.

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post #6 of 33 Old 02-21-2015, 11:23 PM
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Good question, Is the head off? and is there any part of the bolt sticking up?

Yes, being a machinist there are a few ways to get the bolt out with the block off the machine and in the shop. But I'm assuming that's not an option so.... First, spray it with some PB Blast. Then if it is sticking up, maybe you can grab it vise grips. Or take a hack saw and cut a groove in the top to use a flat head screw driver in.

If its not sticking up, grab a punch and a hammer. Look to see if there's a high spot on the broken bolt and use that point as leverage to tap the bolt around and out with the punch and hammer.

When you tried the screw extractor (or easy out as sometimes they're called) Did you first drill a smaller hole in the bolt so the extractor could get in there and actually have something to bite into?

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post #7 of 33 Old 02-21-2015, 11:24 PM Thread Starter
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I've heated the areas up with a propane torch, beat the extractors in with a hammer and they still won't budge.

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post #8 of 33 Old 02-21-2015, 11:31 PM
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I see you answered a couple questions while I was typing my response. Try the hammer and punch. You may need to drill, tap and heli-coil at this point.

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post #9 of 33 Old 02-21-2015, 11:42 PM
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Another thought. Drill the next size up. You may be able to make the wall of the thin enought to get the actual threads to fall out or pick them out. May even need to go 2 or 3 up with the dill bit depending on what size the hole is at now

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post #10 of 33 Old 02-21-2015, 11:54 PM Thread Starter
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Another thought. Drill the next size up. You may be able to make the wall of the thin enought to get the actual threads to fall out or pick them out. May even need to go 2 or 3 up with the dill bit depending on what size the hole is at now
I thought about trying that. I'll see if that does any good. If not, I guess I'll drill it all out and re-tap the threads.

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