Re: helicoils

Posted by Rod (NH) on May 16, 2002 at 10:59:35 from (207.3.148.131):

In Reply to: helicoils posted by John Mitteer on May 16, 2002 at 10:07:44:

Hi John,

Best to do it with the head off. I assume you are talking an automotive or tractor engine rather than, say a small single cylinder engine. If it's a small engine, I'd just bite the bullet and pull the head...it's just too easy not to do that. That said though, for a multicylinder engine I have done one with the head in place without any adverse after effects that I know of :o).

I would strongly suggest use of the real HeliCoil tool for this purpose rather than some cheaper knock off...it has an excellent pilot thread, reamer section and final tap built into the tool that makes the process easy, although somewhat expensive if you only are doing one hole.

Put plenty of heavy grease on the tool and work only a little bit at a time...don't thread the thing in all the way in in one fell swoop. Keep taking it back out, cleaning the grease and chips off, regreasing and threading a little more each time for several times until you get it completed. That way you will minimize the possibility that chips will be left in the combustion chamber.

Good luck.

Rod

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