<VV> Spark plug thread repair - ??

[Charles Lee]

Doug,

It looks like a "heli-coil" though I haven't seen one in a while now.

These were used to replace a stripped thread in a spark plug opening to
avoid replacing the head ?

I believe that's what you have found - a real relic ?

Charlie'

-----Original Message-----
From: virtualvairs-bounces at corvair.org
[mailto:virtualvairs-bounces at corvair.org] On Behalf Of Doug Mackintosh
Sent: Sunday, September 14, 2008 7:28 PM
To: Virtual Vairs
Subject: <VV> Spark plug thread repair - ??


I've never seen anything like this before. Can anyone tell me what I'm
looking at, and any ideas how to fix it?
 
This is on the mongrel Corvair I am working on. The engine is (mostly)
1965 110 HP. The # 6 spark plug hole has this protrusion, which I assume
is part of some attempt at thread repair. As you can see, it protrudes
(approx 1/8 inch) from the head. The surface the plug gasket would seat
on is a narrow edge (not a nice wide gasket seat as would normally be in
the head). The threads go partway down the hole. Where the
threads/insert end, the hole in the head is larger diameter. The threads
also stop short of the top - there is a small (1/32" ?) counterbore in
the top before the threads start. Here is a link to a photo:

http://www.flickr.com/photos/30499360@N07/2858425990/
 
Does this look familiar to anyone? Does anyone know what to do about it?
I hesitate to do anything since at this point,  I don't understand how
it was installed.
 
Thanks

-- Doug Mackintosh
Corsa member since 1996
Corsa/NC member since 1996, Virtual Vairs member
Corvair owner 1969-1971 and 1996-on


      
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