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Head Stud Pulled out of Case

Matronics Email Lists Forum Index -> CorvairEngines-List

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sdthatcher

Joined: 13 Mar 2008
Posts: 91
Location: Port Saint Lucie

Posted: Tue Jun 22, 2021 6:40 am Post subject: Head Stud Pulled out of Case

After using Arp lube and using the Finch method for torquing the Head Studs, one of the studs simply came out of the case at about 17 ft-lbs, dragging the threads of the case with it. It looked like a neat little spring. So now after reading William Wynne's articles on thread patterns of the studs, I'm trying to discover the best way to tap the case to accept either the original stud or one that has a more universal thread pattern. Note that the case now has no threads shown and looks like a clean reamed out hole. Any suggestions?

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_________________
Scott Thatcher, Port Saint Lucie, FL
601XL with Corvair, Registered as E-LSA
N601EL, EAA203 140 hours and not flying currently.

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