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EFV-8 Club Forum / General Ford Discussion / Broken Head Stud

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Discussion Topic: Broken Head Stud

jamesmundstock

06-18-2017 @ 10:22 AM

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Posts: 113
Joined: Apr 2017

I twisted off one head stud. I made a drill guide bushing and tapped it in the head so I could drill the center of the stud straight. My tap chart says the drill size for a 7/16-14 tap is 23/64 but that was too large when I checked another stud tapped hole. 11/32 was slightly loose so I used it and then tapped the hole out to chase the threads of the stud out. The threads look ok but the tap is loose compared to the other tapped holes. The tap brought out three rings which I am hopping was remnants of the stud thread. I am still not happy with a loose thread. I put another stud in and torqued the head nut to 55 lb-ft and it did not keep wanting to turn. I am still nervous about a loose thread. Has anyone used a time-cert or heli-coil thread repair and had luck with it holding? Thanks in advance for responses.

alanwoodieman

06-18-2017 @ 11:16 AM

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if you torqued the stud to 55 ftlbs , go back after a day or so and see if the bolt will turn-in other words find out if it held the 55 ft lbs. if so then the only worry I would have is a coolant leak around the questionable threads on the stud. I hate to use heli-coil's. never seem to have good luck with them

supereal

06-19-2017 @ 2:02 PM

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If you used a common rethreading tap to clear the hole, it is likely that the threads have been damaged. Always use a chasing tap to preserve the threads. At our shop we often use Helicoil inserts for damaged or missing threads. If you have problems, it is likely the insert was not properly installed. A good machine shop can remedy the situation. Always use a good non-hardening sealer on the block end of studs when you install them some enter the waterjacket and will produce "wet" studs if not sealed. We use a Permatex sealer.

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