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RE: Leaking heater valve TR6

Subject: RE: Leaking heater valve TR6
From: "Randall" <tr3driver@comcast.net>
Date: Sat, 4 Sep 2004 09:44:37 -0700
Cc: "Big Triumph List" <triumphs@autox.team.net>
> 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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