[Healeys] Thread Size for Overdrive operating Valve Plug
Bob Haskell
rchaskell at earthlink.net
Sat May 23 13:52:24 MDT 2020
I made an adapter to 1/4" NPT years ago. Looks like the thread is
1/2"-20. Mine measured 0.495". Michael has the right idea, that allows
you to keep the ball and spring in place and measure the pressure under
normal operation.
Cheers,
Bob Haskell
Austin Healey 3000 BN7/BT7 registrar
On 5/23/20 2:26 PM, jpaynepbr at cox.net wrote:
> Anybody know what the official size designation and thread is for the
> Overdrive Operating Valve Plug?
>
> Trying to fit up a pressure gauge, and having issues finding the right
> adapter. The Major OD of the plug is .49”, and the British standard
> pipe taper and parallel major OD is .51”, so they aren’t going in.
>
> Thanks,
>
> Jonas
>
>
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