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[SPAM] RE: headbolt thread q



Koabi, I have heard that the preferred method of cleaning the threads in
the head is to use a 'thread chaser' and not a tap.  The thread chaser
is not a cutting tool, as in the case of a tap, it is a cleaning tool.
If your factory threads are damaged then that is another situation.
	The next problem is to find a chaser with the correct size and
pitch.  After searching the web for a while, the best I could do is
locate a set of chasers.  Unfortunately, the sets of chasers were quite
expensive (~$100).
	A fellow lister suggested making a chaser from an old head bolt.
He suggested cutting a grove parallel to the bolt shaft (and basically
perpendicular to the threads).  The grove did not extend the length of
the bolt, only at the base and approximately 1/4 of the way up. Next,
the threads on the bolt are cleaned with a file to remove any burrs.
This grove acts as a trash collector as the threads are cleaned by
running the bolt through the block. 
Rick. 

-----Original Message-----
From: scirocco-l-bounces@scirocco.org
[mailto:scirocco-l-bounces@scirocco.org] On Behalf Of koabi
Sent: Sunday, October 10, 2004 1:54 PM
To: scirocco-l@scirocco.org
Subject: headbolt thread q

It looks to be 1.5 pitch but it's bigger than M10 and smaller than M12 -
I am trying to get a tap to clean out the threads and it's not going
well.  What size is it?!

TIA!
koabi


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