I don't know how much is too much, but I can say that re-bushing will not
affect the end play in the shaft. I suspect that there is much wear in
this area. The cause of increased end play is when the buterfly wears on
the inside of the carb throat, causing metal on the butterfly, or the
inside of the throat to wear away. The butterfly can be replaced, but I
believe that the throat on the 1600 carbs is part of the main casting.
Peace,
Pat
- Support Habitat for Humanity, A "hand up", not a "hand out" -
Pat Horne, Network Manager, Shop Supervisor, Future planner
CS Dept, University of Texas, Austin, Tx. 78712 USA
voice (512)471-9730, fax (512)471-8885, horne@cs.utexas.edu
On Tue, 12 Mar 2002, Brian St. Jacques wrote:
> Yes, by side to side I'm talking about the shaft sliding in and out. How
> much play between the shaft and the bushing is too much?
>
> Brian
> '68 1600
>
> -----Original Message-----
> From: owner-datsun-roadsters@autox.team.net
> [mailto:owner-datsun-roadsters@autox.team.net]On Behalf Of Patrick J.
> Horne
> Sent: Tuesday, March 12, 2002 10:18 AM
> To: Brian St. Jacques
> Cc: Datsun-Roadsters
> Subject: Re: 1600 Su's
>
>
> By side to side play are you talking about the shaft sliding in and out?
> If so, that shouldn't be a problem. That just means that there is
> clearance between the bore of the throat and the butterfly. That
> shouldn;t cause any problems because the airflow around the butterfly will
> be part of the airflow that is required for idle. The place that the air
> leaks that re-bushing the carb are located is when the shaft does not fit
> the bushes tightly, allowing air to enter the carb around the shaft. I
> wouldn't have any problem with .001" clearance around the shaft. Make sure
> that when you measure this clearance that the butterfly is open so you
> don't have binding between the butterfly and the throat interfering with
> the measurement.
>
> Peace,
> Pat
>
> - Support Habitat for Humanity, A "hand up", not a "hand out" -
>
> Pat Horne, Network Manager, Shop Supervisor, Future planner
> CS Dept, University of Texas, Austin, Tx. 78712 USA
> voice (512)471-9730, fax (512)471-8885, horne@cs.utexas.edu
>
> On Tue, 12 Mar 2002, Brian St. Jacques wrote:
>
> > Hello out there,
> >
> > I have a question regarding re-bushing the throttle shafts on the 1600 SU
> > carbs. I just pulled mine in order to do a rebuild on them and the first
> > thing I checked was the throttle shafts. At WOT, there is about .020" of
> > side to side movement of the butterfly valve that goes away when it is
> > closed. As for the shaft play in the bushing, I would say there is
> probably
> > a good .001" of slop.
> >
> > So does it sound like these carbs are in need of new bushings? If so, what
> > is the "reasonably priced" route to go? I looked at the Z-Therapy site and
> > there carbs are a little more than I am looking for in price and
> condition.
> > I am more than willing to go after the rest of the rebuild myself, but I
> > would rather not get into the shaft bushings. As always, your help is
> > greatly appreciated!
> >
> > Brian
> > '68 1600
> >
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