[Healeys] pressure relief valve

[John & Kerry Rowe]

Actually the thread is 1/8 NPT-27 tpi ,which tap is usually supplied in most
kits which is fairly close to the 3/8x28tpi. Why this is in these kits is
beyond me, but it is there!
John Rowe
Qld Australia
BN1 BT7

-----Original Message-----
From: healeys-bounces at autox.team.net [mailto:healeys-bounces at autox.team.net]
On Behalf Of Michael Salter
Sent: Sunday, 3 October 2010 11:05 AM
To: healeys at autox.team.net
Subject: Re: [Healeys] pressure relief valve

Actually I don't think it is either.
The thread is 3/8" x 28 T.P.I. whereas BSF is 3/8" x 24 T.P.I. I was able to
buy a tap for it many years ago after discovering that 3/8" x 24 just would
not do the job!!
Why on earth they used such a fine thread in aluminum I have no idea but I
guess someone had a "better idea".

Michael Salter