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Re: Aluminum heads

To: Dave Wood <djw69@idt.net>
Subject: Re: Aluminum heads
From: "Andrew B. Lundgren" <Lundgren@iname.com>
Date: Tue, 23 May 2000 11:42:04 -0600 (MDT)
Anti-seize is good to use because the metals will bond together, the AL does 
not melt.  I put in heli-coils in my AL head to strengthen the plug holes 
preventing cross threading problems.  As a side effect I have now got stainless 
steel plug holes that don't have the seize problem on the plugs.  All of the 
bolts that I run into the head I use anti-seize on.  

On Tue, 23 May 2000, Dave Wood wrote:

> I changed the plugs in my daughters Mazda last night before I took it though
> the pollution test this morning where it passed I'm happy to say.  My
> question is about the difficulty I had in removing two of the plugs.  I've
> never had a plug so reluctant to be taken out.  Two of them fought me all
> the way out.  The engine had been run briefly about 3 hours previously so it
> was pretty cold by the time I removed the plugs.  The most difficult one had
> aluminum in the bottom two or three threads.  Does the aluminum melt into
> the plugs or what?  The reason I am so concerned is that I need to change
> the plugs in my wife's Olds V6 which is going to be a misery anyway as I
> have to disconnect the dog bones and rotate the engine toward the front in
> order to remove the plugs on the firewall side.  Since it also has aluminum
> heads and I know that the plugs have never been changed, am I looking at the
> same kind of difficulty to remove those?  I understand that it is a good
> policy to put anti-seize compound on any bolts that go into aluminum and I
> assume this is correct for plugs as well?  The only MG content is that there
> are aluminum heads available as replacement heads which I assume could cause
> the same kind of problem.
> 
> Thanks in advance,
> 
> Dave 72 B
> 
> 


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