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The Gman

Sheared head bolt "help"

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The Gman

Got another 212 this week. Low compression. Looked like the bottom, sprayed with soap and saw blow by. Bottom bolts were easy to loosen.

Well I done did it. Sheard one of the bolts.

Used heat and pb blaster many times over the coarse of two days.

 

Any thoughts out of this?

It's a Kawasaki 12hp

20180517_130859-2.jpg

20180517_130852.jpg

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BOB ELLISON

I've heard from others to take a nut and weld it in the center to the broken stud. The heat will help brake it loose and the nut head will turn out. Drilling and a easy out is the other way but I have broken a easy out on those before.

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WHX??

I like Bob's idea of welding a nut on it .

Might be some other suggestions here too.

 

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The Gman

Lots of good ideas in that thread, thanks.

Might go with a 1/6 or 1/8 th diamond coated bit to get a good pilot thru it then open to 3/6 ths. Then heat and go with a 1/4 left hand drill. Just gotta be sure it's as close centre as I can.

The left over thread is an inch long and open thru the back.

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953 nut
13 hours ago, The Gman said:

Just gotta be sure it's as close centre as I can

I have found that taking a file to a broken stud and getting the center flat prior to center punching will help ensure a good centering.

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WHX??

Sounds like a good plan Gman... lots of PB Blaster & keep the heat wrench handy. Let us know how it pans out.

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doc724

Done that myself.  Ended up pulling the motor, taking it to a shop that had a big drill press and they drilled it out and cleaned up the threads.  Replaced it with a stud and the stud was installed with high temp JB weld.  That was three years ago and no problems to date, other than the hit to my wallet for 3 hrs of labor to drill out the stud. 

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joel_400

My suggestion would be to weld a washer to the bolt first then weld a nut to the washer. A man I know who works for lincoln welding taught me that trick. Doing alot of automotive exhaust over the years means removing alot of broken studs. Nothing I hate more than trying to drill hard metal out of softer surrounding metal. Since learning this trick I have taken my success rate from 60% to 95% compared to just trying to weld a nut on it. The reason is that using the washer gives you a bit more control and ability to penatrate the stud. Good luck.

Joel

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