[Roadsters] Was cleaning carbs / Now pre-ISO threads

[Gary and Cindy Ault]

Folks,

Remember that Hitachi copied SU carbs (under license, I presume). They 
probably used Whitworth Standard (British) threads.  Has anyone ever tried 
to use genuine SU dome screws from Moss Motors or the like?  Somewhere in 
the back of my aging mind I seem to recall being told that they're a 27 
pitch thread, as opposed to 28 pitch, which would be SAE.  Close, but no 
cigar.  My guess is theBritish parts will work, but I really don't know.

Gary Ault

----- Original Message ----- 
From: <hallosb at juno.com>
To: <datsun-roadsters at autox.team.net>
Sent: Tuesday, December 18, 2007 8:56 PM
Subject: [Roadsters] Was cleaning carbs / Now pre-ISO threads


> Pre-ISO metric screws?? Never heard of such a thing. And I thought the
> clutch head screws on my '56 Chevy were unusual.
>
> This might explain those impossible to find replacement screws.  When I
> disassembled my heater valve, I lost a screw I couldn't replace.  Same
> thing happened with the original alternator.  I have a thread gauge and
> every once in a while I find an unusual thread I can't match with any
> standard sizes either metric or SAE.
>
> Most everything on my '66 is SAE but, it seems like some of the parts do
> use metric threads. Do our cars have a mixture of both SAE and metric?
>
> Dan McHatton
> '66 1600
>
>
>
> On Tue, 18 Dec 2007 11:38:42 EST Keith0alan at aol.com writes:
>
> Be very careful with the dome and float cover screws.  They are pre-ISO
> metric and are impossible to find as they have not been made
> for decades.
>
> keith williams
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