[TR] TR head rebuild

[Catpusher at aol.com]

The plug is threaded into the head and usually leaks only after extreme heat 
or chemical cleaning.
The very late factory TR4A heads had the outer top of the plug peened after 
installation (hint)
 
A race track fix is to drill and tap the center of the plug, and run a set 
screw into the hole after putting
a stout flat washer with on OD larger than the plug over the top of the plug. 
 Use sealer under the washer
and on the setscrew. A copper flat sealing washer under the head of the 
setscrew is a good idea.  When you tighten the set screw, it pulls on the plug 
threads in the head and helps seal them.  I raced a head with this fix for many 
seasons, and no water ever leaked into the oil.
 
Hardy

From: "Bob Nogueira" <nogera at worldnet.att.net>
Subject: [TR] TR head rebuild
To: <Triumphs at autox.team.net>


Well the beat goes on, just returned from the machine shop that is
rebuilding the head for my engine. They pressure tested it and say there is
a very tiny leak around the edge of the aluminum plug that is located under
the valve cover in the center of the engine ( to see a picture of the
offending part go to http://www.texmog.com/Head.htm. The leak is very small
and definitely around the edge not through the plug itself.  They are
reluctant to try tapping the plug in more since neither they nor I know how
it is affixed nor if a replacement is available. 
Note they pressure tested it at 40 lbs and I had them drop it to 20 psi (
the lowest the gauge would register) and the tiny bubbles remain. 
Any suggestions or advise out there? 

Bob    


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