<VV> Spark plug thread repair - ??

[Ron]

It looks like an incompletely installed thread insert but not a helicoil. 
Someone will recognize exactly what it is, I hope, but it sure looks like it 
can be unscrewed after which I'd try to screw in a new replacement, making 
sure that it goes in all the way.  Search the internet for thread inserts 
and see if any match up with the one you have.  If one does, call the 
manufacturer for some removal techniques.

RonH

----- Original Message ----- 
From: "Doug Mackintosh" <dougmackintosh at yahoo.com>
To: "Virtual Vairs" <virtualvairs at corvair.org>
Sent: Sunday, September 14, 2008 7:28 PM
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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