Helicoil size for head bolt
- Thread starter j_rov
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Blimey! How did you do that!? Hope the block survives.
Have you thought about using an extractor bit?
Have you thought about using an extractor bit?
Last edited:
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- 33,600
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I just worry with helicoil, especially on a head bolt, you need to be very sure you drill perfectly straight.. don't know the bolt size but you should see it listed somewhere i would have thought
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make your own mind up, if you think these are right... never done the head on a 3.9 so not sure
https://www.lrdirect.com/err2943-cylinder-head-bolt-4-6v8-short
https://www.lrdirect.com/err2943-cylinder-head-bolt-4-6v8-short
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Agrees with my link
hi mate
funny enough watched this the other week regarding snapped bolts etc ,plus some guy using a hinge centre drill , wished to share the link in case u found it interesting
freelance
Well-Known Member
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So ask him to remove the broken stud !
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Try welding a washer onto the thread end, give it a tap with a hammer afterwards then weld a nut onto the washer via the inside of the nut. Tap that with a hammer and it may undo.
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I feel your pain. It'll need a good drill bit as they'll be hard as hell. Never had to do that yet but good luck!
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Left handed drill or mill bit ? That way if it snatches at the bolt, it might unscrew itself ?
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- 19,297
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- Buckinghamshire, UK. ('95 DT)
If water has got down that thread enough to snap the head-bolt I really cannot see it shifting.
I'd be tempted to cut a groove up each side of an old head bolt and run it in and out of the old holes once they're all out to clean out the threads. A bit of moly CV grease on the new bolts to help them slide in and out before refitting the head might help too. Still, got to get that last bugger out first!
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Once you get the broken bit out, consider investing in the ARP Stud kit. Makes re-torqueing the head much easier.
