> 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.
In this particular case, that's exactly the idea. Since these threads are
tapered, the fitting just screws in a little deeper and the threads still
seal against the freshly cut surface.
For the more general case, I still disagree with your machinist.
Randall
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