Probably a wise decision
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| Crooked heilcoil https://slantsix.org/forum/viewtopic.php?t=64893 |
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| Author: | Pgbarrow [ Thu May 14, 2020 10:06 pm ] |
| Post subject: | Crooked heilcoil |
Hi all, I went to repair the threads on my bellhousing last night and have made a mistake. This bolt hole is one of the four that hold the bellhouse to the transmission. After drilling, tapping, and installing the heilcoil I inserted the bolt to check the fit and discovered it was at a noticeable angle, maybe 5-10 degrees. I am unsure of the best way to proceed, but will start by drilling the heilcoil out bit by bit to try and protect the diameter of the hole. One of the guys on here had also recommended and threaded insert. Would it be possible to find one to fit in a odd sized hole with a 7/16 inner diameter? I may go to a machine shop for this one. Paul |
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| Author: | ProCycle [ Fri May 15, 2020 7:11 am ] |
| Post subject: | Re: Crooked heilcoil |
If you can pick out the end of the helicoil you can probably unwind it out of the hole with no drilling. |
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| Author: | Joshie225 [ Fri May 15, 2020 7:46 am ] |
| Post subject: | Re: Crooked heilcoil |
If you don't have a drill press then you should farm out this job. |
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| Author: | Pgbarrow [ Fri May 15, 2020 10:38 am ] |
| Post subject: | Re: Crooked heilcoil |
Hi Joshie and Procycle, I have a Harbor Freight one, but I think the best thing is to see an expert at this point. I'm honestly not sure why my drill would have gone crooked, but it is only the second time I've used a heilcoil. As far as picking it out, I don't want to do any more damage to the bellhousing before someone looks at it. Paul |
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| Author: | ProCycle [ Fri May 15, 2020 10:49 am ] |
| Post subject: | Re: Crooked heilcoil |
Probably a wise decision
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| Author: | Joshie225 [ Fri May 15, 2020 12:00 pm ] |
| Post subject: | Re: Crooked heilcoil |
Quote: Hi Joshie and Procycle,
The drill may have been straight, but that doesn't mean the tap was also straight.I have a Harbor Freight one, but I think the best thing is to see an expert at this point. I'm honestly not sure why my drill would have gone crooked, but it is only the second time I've used a heilcoil. As far as picking it out, I don't want to do any more damage to the bellhousing before someone looks at it. Paul What you have to do to make sure the hole is tapped straight is: 1. Secure the work to the drill press table. 2. drill the hole 3. remove the drill from the chuck 4. insert a tap follower in the chuck 5. tap the hole using the tap follower to keep the tap plumb/square |
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| Author: | ProCycle [ Fri May 15, 2020 12:02 pm ] |
| Post subject: | Re: Crooked heilcoil |
+1 Left to its own devices a tap will try to start crooked every time. |
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| Author: | Pgbarrow [ Fri May 15, 2020 2:48 pm ] |
| Post subject: | Re: Crooked heilcoil |
One day I hope to have a real shop. That said, I don't know if I can adequately express how utterly irritated I was last night. I'm going to have a very expensive bell housing. Paul |
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| Author: | bcschief [ Fri May 15, 2020 3:11 pm ] |
| Post subject: | Re: Crooked heilcoil |
Take it to a machine shop and have them put a keensert in it. |
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| Author: | twali40 [ Sun May 24, 2020 3:46 pm ] |
| Post subject: | Re: Crooked heilcoil |
You should be able to unwind the helicoil to remove it. I would not try to drill it out as the stainless is likely to mess up the soft aluminum. You can have the hole redrilled for a timesert, keensert or EZ lok. They are all much larger than a helicoil so the current hole shouldn't be a huge ordeal. I'm pretty sure the helicoil drill for that bolt is 7/16" where as the EZ lok requires 3/4-10 tap. As others noted, likely best to get it on a large drill press to straighten out the hole. Best of luck. |
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| Author: | NEVjr [ Sat Aug 15, 2020 8:36 pm ] |
| Post subject: | Re: Crooked heilcoil |
Quote: One day I hope to have a real shop. That said, I don't know if I can adequately express how utterly irritated I was last night.
check out your local makerspace. mine has a reasonably well equipped machine shop
I'm going to have a very expensive bell housing. Paul |
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