[Roadsters] screw thread size for hitachi carbs

[Keith0alan at aol.com]

I don't know for sure. 
 
 
In a message dated 7/6/2013 7:36:07 A.M. Pacific Daylight Time,  
ljordan704 at netscape.net writes:

So the  ones available from Dean and Rallye are non-  standard?

Linda

Sent from my iPod

On Jul 6, 2013, at 5:51  AM, keith0alan at aol.com wrote:

> Hello all,
> 
>   As far as I know all 1600 carbs are 5x.75 pre ISO French standard  
metric.
> I have never found anyone making them. Early 2000 carbs are  the same. 
Late
> 2000 and Z carbs are ISO 5x.8 and are commonly  available. There are a 
couple
> of options. There is a number size screw  quite close. .75mm threads are 
33.8
> tpi, .8mm is 31.75 tpi. The .75  hole can be tapped to .8 . You loose some
> material but it does work.  What I do is take the original screws and 
lightly
> tap the head to push  the metal back into place then tap a new phillips 
bit
> into the recess  to reform the head. A little fiddly but it works. 
Carefully
> cutting a  flat slot with a hack saw is an option but pretty far down the 
list.
>  Always take good care of your original screws using a proper fitting  
screw
> driver. Some penetrating oil and a little heat will help loosen  them. I 
will
> also grab them with a tiny pair of vice grips. This will  mark them up a 
little
> but saves the screwdriver recess.
>  
> keith williams
> 
> 
> -----Original  Message-----
> From: ppeters914 <ppeters914 at comcast.net>
>  To: Datsun Roadster List <datsun-roadsters at autox.team.net>
> Sent:  Sat, Jul 6, 2013 1:01 am
> Subject: Re: [Roadsters] screw thread size  for hitachi carbs
> 
> 
> Good luck, but.....
>  
> The headlight retaining screws on the 411 are 4mm with that odd .75  
pitch. I
> checked with Tacoma Screw, Maryland Metric, and several  others. They 
don't
> exist.
> 
> Googling found one  reference to an old (WWII?) French rifle part.
> 
> Maybe  Ztherapy?
> 
> Pete
> Sent via BlackBerry by  AT&T
> 
> -----Original Message-----
> From: "Gordon  Glasgow" <gsglasgow at comcast.net>
> Sender:  datsun-roadsters-bounces at autox.team.netDate: Fri, 5 Jul 2013 
22:02:08
>  To: 'robert williams'<wilrobasy at hotmail.com>;
>  <datsun-roadsters at autox.team.net>
> Subject: Re: [Roadsters] screw  thread size for hitachi carbs
> 
> Disclaimer: These are the sizes  I measured on my 2000 SU's, but I don't
> think the 1600 ones are  necessarily different. Oddly, my parts manual 
lists
> the same part  number for both the piston pot screws and the float bowl 
cover
> screws  on the 2000 SU's (contradicting what I just measured), but 
different
>  numbers for those two screws on the 1600.
> 
> The screws for the  piston pots are 5mm x 0.8 pitch. That's pretty 
standard.
> 
> The  screws for the float bowl covers are 5mm x 0.75 pitch, which is
>  definitely not standard. I believe it's called a French Metric. You 
might  be
> able to special-order them through a place like Tacoma Screw  Products if 
the
> vendors don't have them.
> 
> Gordon  Glasgow
> 
> -----Original Message-----
> From:  datsun-roadsters-bounces at autox.team.net
>  [mailto:datsun-roadsters-bounces at autox.team.net] On Behalf Of robert
>  williams
> Sent: Friday, July 05, 2013 7:37 AM
> To:  datsun-roadsters at autox.team.net
> Subject: [Roadsters] screw thread size  for hitachi carbs
> 
> Hello List,
> 
> The ground up  resto is in the home straight so looking to finish up a few
> smaller  items.
> Does anyone know the thread size of the following  screws:
> 4 x phillips head screws that fasten the top of the float  bowls on the
> hitachi carbs 4x screws for the piston pots on the carbs  for an early 
(1966)
> 1600 low screen.
> 
> I thought they  may be 11/32 unf but alas they seem to be a smaller.
> The tops of my  screws are burred and battered from years of abuse so 
thought
> I would  replace them.
> 
> regards,
> 
> Rob
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