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.
> From: Randall
>> To: 'shop-talk'<email@example.com>
> Monday, November 21, 2011 9:31 PM
>> Subject: Re: [Shop-talk] installing a
>>> you probably have a 60/40
>> 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
> Donate: http://www.team.net/donate.html
> Suggested annual donation $12.96
> Archive: http://www.team.net/archive
> Forums: http://www.team.net/forums
Suggested annual donation $12.96