Should I just bite the bullet and pull it?
Seasoned HDF Member
Joined: Mar 2010
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From: Poolville
All the more reason to use studs..
HDF Community Team
Joined: Aug 2018
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From: New Hampsha
Don't forget that the Timesert will sit proud of the surface of the part by the thickness of the flange. I would think if you're mounting an exhaust bracket that would be undesirable.
Heli-coils shouldn't pull out if properly installed. We use them in aircraft spark plug holes and the plugs are pulled at least once a year for inspection.
22 ft-lbs on a bolt that is bottomed out puts a whole different load on the threads than 22 ft-lbs on a bolt that's clamping something (and stretching the bolt.)
Last edited by John CC; Nov 16, 2024 at 08:10 PM.
Seasoned HDF Member
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From: Poolville
I believe those screws are 5/16 x 18.. Technically for popper torquing and clamping force with any bolt you would need to get one and a half times the diameter of the bolt thread into it's fixture. Using a longer bolt will not aid in clamping/torquing force..
So 1.5 x 5/16 = 15/32 .. So on a 5/16 x 18 screw that would be roughly 9 threads to safely reach the max torque of that fastener..
So 1.5 x 5/16 = 15/32 .. So on a 5/16 x 18 screw that would be roughly 9 threads to safely reach the max torque of that fastener..
Seasoned HDF Member
Joined: Jan 2015
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From: Sandy Eggo's North County
OP, I'm not a big fan of inserts, unless there is absolutely no other alternative. Since you have a full inch and a half of material to thread, what are the chances of utilizing a "non-traditional" size to drill/tap new threads? Is there enough material internally to support thread strength for this purpose? This would be the deciding factor, on whether to use inserts or not.
One other factor to consider.... some of these holes support a vibrating exhaust system. This could mean "excessive wrenching." These threads are going to have to withstand that, also.
Might even suggest a non-permanent thread locker....
Factor this into your methods .
One other factor to consider.... some of these holes support a vibrating exhaust system. This could mean "excessive wrenching." These threads are going to have to withstand that, also.
Might even suggest a non-permanent thread locker....
Factor this into your methods .
Last edited by NORTY FLATZ; Nov 17, 2024 at 10:39 AM. Reason: Add'l info
Thread Starter
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Stellar HDF Member
Joined: Aug 2019
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From: Unreconstructed
OP, I'm not a big fan of inserts, unless there is absolutely no other alternative. Since you have a full inch and a half of material to thread, what are the chances of utilizing a "non-traditional" size to drill/tap new threads? Is there enough material internally to support thread strength for this purpose? This would be the deciding factor, on whether to use inserts or not.
One other factor to consider.... some of these holes support a vibrating exhaust system. This could mean "excessive wrenching." These threads are going to have to withstand that, also.
Might even suggest a non-permanent thread locker....
Factor this into your methods .
One other factor to consider.... some of these holes support a vibrating exhaust system. This could mean "excessive wrenching." These threads are going to have to withstand that, also.
Might even suggest a non-permanent thread locker....
Factor this into your methods .
Well, after watching the new video @Max Headflow posted and drinking about it last night while watching more videos, I am going to go with the Heli-Coil. Bonus, I already have a kit I bought a couple of years ago to do this job. The race puller showed up this morning and I might have time to get out to the shop after getting some work done. I really appreciate all the good input guys; I've learned a lot.
Road Captain
Joined: Oct 2020
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From: Central Iowa
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That was really interesting. I'm in the category that's been lead to believe that time-serts were by far the superior choice, and maybe in some instances they are, but this video shows otherwise.
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From: poway
I wonder if it's the fact that there is some clearance between the timesert insert and the hole.. Helicoils wind in and have tension on the hole for max bite.
