When I was reassembling my engine last year my machinist warned me not
to use normal taps to clean threads. He told me there are special
"thread chaser" taps to use for cleaning threas. The problem being the
ordinary tap will cut away thread surface and loosen the fit.
> Jim, I don't have much experience with TR6 heads, but on TR3 heads I
> generally make it a practice to chase those threads with the appropriate
> pipe tap. Your local tool supply house should have the tap (think I paid
> $10 for mine), and you can use an 8pt socket with a T-bar to turn it.
--
Best regards,
Tom
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