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Re: [Shop-talk] installing a helicoil

Subject: Re: [Shop-talk] installing a helicoil
From: Neil Sherry <>
Date: Tue, 22 Nov 2011 08:02:32 +0000
Machine shop where I worked didn't use Helicoils for spark plug holes - 
we had shouldered tubular inserts. Admitedly, they required a bigger 
hole to be drilled & tapped, but as long as the head had enough room 
they were less likely to give problems...

On 22/11/2011 04:06, Rand E wrote:
> I was going to suggest the Timeserts but you beat me to it.
> Check Amazon.
> They had the best prices when I looked for one of these.  I ended up getting
> them at the local Fastenal dealer (who also had the helicoils) but I think
> Amazon would have been quicker.
> Randy
> From: Randall
> <>
>> To: 'shop-talk'<>
>> Sent:
> Monday, November 21, 2011 9:31 PM
>> Subject: Re: [Shop-talk] installing a
> helicoil
>>> you probably have a 60/40
>>> chance..
>> IMO if you can tap a
> hole, you can install a Helicoil.  I'm not particularly
>> good at working
> free-hand, and I've never screwed one up enough to have to
>> take other
> measures.  Ruined an insert once, but only because I didn't turn
>> the tap deep
> enough.  (Was threading a starter bolt hole that ran through
>> the mounting
> flange and into the bellhousing; didn't realize how thick the
>> flange was.
> Bolt jammed against the insert and came out with it attached.)
>>> ...If you
>>> screw it up you not only have the cost of a Helicoil kit but
>>> the cost
> of a new head.
>> There are inserts available that will work in a hole too
> big for a Helicoil.
>> For example:
>> -- Randall
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