Heli coil for spark plug holes

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John Illinois
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Heli coil for spark plug holes

Post by John Illinois » Wed Nov 04, 2020 12:22 pm

I have a head that I got resurfaced and somehow missed inspecting the plug threads. Do tapered pipe helicoils seal ok?
One looks like it has a hacksaw slot cut in side.

John
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Rich Eagle
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Re: Heli coil for spark plug holes

Post by Rich Eagle » Wed Nov 04, 2020 12:37 pm

They do exist. Here is what Stanley makes.
https://www.stanleyengineeredfastening. ... ad-inserts
Here's a kit from Thread Tool Supply.
https://www.threadtoolsupply.com/12-14- ... r-kit.html
Kind of pricey.
When did I do that?
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John kuehn
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Re: Heli coil for spark plug holes

Post by John kuehn » Wed Nov 04, 2020 1:02 pm

Did it have a leak in that hole before you had the head resurfaced?
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Mark Gregush
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Re: Heli coil for spark plug holes

Post by Mark Gregush » Wed Nov 04, 2020 1:44 pm

looks like the cut goes below the thread depth, so bet it would. Here is a link to Oct post on the subject;
viewtopic.php?f=2&t=16663
I know the voices aren't real but damn they have some good ideas! :shock:

1925 Cut down pickup
1920 Dodge touring
1948 Ford F2 pickup
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Les Schubert
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Re: Heli coil for spark plug holes

Post by Les Schubert » Wed Nov 04, 2020 2:24 pm

I have done the repair using genuine Heli Coil a number of times with very satisfactory results!!
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Topic author
John Illinois
Posts: 167
Joined: Mon Jul 29, 2019 1:49 pm
First Name: John
Last Name: Burgett
* REQUIRED* Type and Year of Model Ts owned: 1924 Touring
Location: Camargo Illinois
MTFCA Number: 29590

Re: Heli coil for spark plug holes

Post by John Illinois » Wed Nov 04, 2020 3:36 pm

Buying a Helicoil kit seems like a good option since I already paid to get it surfaced. Even better is the brass plumbers 3/4 to 1/2 adapter in Mark's link. It will be easy to set it up in the mill and install the bushing. I may do all the holes since another one is loose fit.
Thanks everyone for your help.

John
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Dan Hatch
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Re: Heli coil for spark plug holes

Post by Dan Hatch » Wed Nov 04, 2020 6:28 pm

Loc n Switch makes pipe thread inserts.
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Greg Griffin
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Re: Heli coil for spark plug holes

Post by Greg Griffin » Fri Nov 06, 2020 4:28 pm

Check out "Time-Sert". Pricey but superior to Heli-coil in my opinion. Just the thing for stripped threads at the universal ball cap in the oil pan.
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Allan
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Re: Heli coil for spark plug holes

Post by Allan » Sat Nov 07, 2020 1:57 am

I also prefer Timesert/Keyserts. They come in a range of outside diameters which means you can make repairs to oversized holes also. Each may be more expensive than a helicoil, but I can buy them individually, and they have standard threads on the outside, so I don't have to buy an installaton kit.

Allan from down under.
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