The Gman 476 #1 Posted May 17, 2018 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 Share this post Link to post Share on other sites
BOB ELLISON 2,976 #2 Posted May 17, 2018 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. 1 Share this post Link to post Share on other sites
WHX?? 46,404 #3 Posted May 17, 2018 I like Bob's idea of welding a nut on it . Might be some other suggestions here too. 1 Share this post Link to post Share on other sites
The Gman 476 #4 Posted May 17, 2018 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. Share this post Link to post Share on other sites
953 nut 51,027 #5 Posted May 18, 2018 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. Share this post Link to post Share on other sites
WHX?? 46,404 #6 Posted May 18, 2018 Sounds like a good plan Gman... lots of PB Blaster & keep the heat wrench handy. Let us know how it pans out. Share this post Link to post Share on other sites
doc724 924 #7 Posted May 18, 2018 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. Share this post Link to post Share on other sites
joel_400 59 #8 Posted May 27, 2018 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 2 Share this post Link to post Share on other sites