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Jack Shaft · 03-24-2021, 07:54 AM

Torque is used to put the stud in tension. This allows the assembly to be made without a locking device and provides a stable basis for heat cycling. In my experience .6 is an adequate depth of threads for a 7/16th NC stud.

Use a magnetic base drill (rent one) to insure the pilot hole for the insert is square to the deck. Drilling by hand can result in an offset pilot hole, placing two forces on the stud when tensioned. I prefer the integrity of a timesert and use anaerobic sealant on installation (loctite). Anaerobic means in the absence of air it cures, given the weakness and ductility of ford grey iron castings the sealant actually helps support the assembly by filling any void as well as locking it.

03-24-2021, 07:54 AM	#21
Jack Shaft BANNED Join Date: Dec 2019 Posts: 1,196	Re: Head stud repair with insert...Q Torque is used to put the stud in tension. This allows the assembly to be made without a locking device and provides a stable basis for heat cycling. In my experience .6 is an adequate depth of threads for a 7/16th NC stud. Use a magnetic base drill (rent one) to insure the pilot hole for the insert is square to the deck. Drilling by hand can result in an offset pilot hole, placing two forces on the stud when tensioned. I prefer the integrity of a timesert and use anaerobic sealant on installation (loctite). Anaerobic means in the absence of air it cures, given the weakness and ductility of ford grey iron castings the sealant actually helps support the assembly by filling any void as well as locking it.