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1 lunger doo
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busted head bolt
« on: January 7, 2017, 07:53:07 PM »
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got a 65 Oly, with a snapped off bolt probably from overtightening the cylinder head. any tips on how to replace it
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rick
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Re:busted head bolt
« Reply #1 on: January 8, 2017, 06:36:19 AM »
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Were you able to get the head off and expose the broken bolt in the cylinder?
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Re:busted head bolt
« Reply #2 on: January 9, 2017, 09:32:09 AM »
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TAKE THE HEAD AND CYLINDER OFF AND USE A PAIR OF VISE GRIPS OR A SMALL PIPE WRENCH TO REMOVE WHAT'S LEFT OF THE BOLT
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Re:busted head bolt
« Reply #3 on: January 9, 2017, 02:45:39 PM »
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Whoa folks this here is a sixty five Mr one lunger doo has- different animal- no long studs that go through the cylinder and head.

Has four short studs with nuts I believe holding the cast iron jug to the case, then bolt holding the head to the jug.

In a perfect world you could remove the head, and see if you can get a small punch to get the remains of the bolt spinning and thread it out thataways.  Depends on how far down in there it is.

OR you can try drilling the center of the bolt out and using an EZ-out to take the piece out. 

What you may need to do is pull the jug, take it to a machine shop and see what they will charge. I broke an exhaust bolt off and knew I would mess it up worse trying to remove it, I just spent fifty bucks having it professionally extracted.   
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Re:busted head bolt
« Reply #4 on: January 9, 2017, 06:08:58 PM »
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Or try welding a hex nut to the top of he broken bolt. The heat will sometimes break it free and you can back it out with a wrench on the nut you welded on.
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Green and Gold
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Re:busted head bolt
« Reply #5 on: January 12, 2017, 04:30:10 AM »
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X2 on welding a nut to the top of the stud; as long as you can get a TIG tungsten to arc on the stud remains.  Don't want to melt the case.  There's a pretty neat video of a fellow building up a car stud that had broken off just below level of an engine case.  Builds up enough of a bead to get the stud to extend high enough then uses a set of vice grips.  Search on "Broken stud TIG"

Once you've extended the stud you can add a nut to make things easier.  Make sure you let it cool completely (air cool, no water----don't want to make martincite) before trying to back out.    If it still doesn't want to turn easily, use the Tig again but this time to heat the stud to a dull orange, let cool again, try again.   

I've never had too much luck with EZ outs, have to be so hard that they're brittle.   

2nd option would be to precision drill it out  with a carbide.

Good luck

I've used it on alum Briggs and Stratton cases and worked well, i.e. didn't screw up the cases and the bolts have eventually come out.    The threads were shot in one of the holes but a helicoil fixed that. 
« Last Edit: January 12, 2017, 04:40:00 AM by Green and Gold » Report to moderator Logged
1 lunger doo
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Re:busted head bolt
« Reply #6 on: January 22, 2017, 09:48:37 AM »
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Thanks for all the suggestions
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