We have problem's with those on BMW's also. In fact they have come up with a
new style vent hose that has a screen on it to prevent it from happening.
Ken
DATSTER
----- Original Message -----
From: "Patrick J. Horne" <horne@cs.utexas.edu>
To: <datsun-roadsters@autox.team.net>
Sent: Wednesday, May 10, 2000 12:28 PM
Subject: It's award time!
>
>
>
> Be it known to all people that
>
> TOM WALTER
>
> is hereby awarded the
>
> LONG DISTANCE/ X-RAY VISION AWARD
>
> for his troubleshooting of
> Hitachi carb problems from 60 miles
> away.
>
> -----------------------------------
>
> I rebuilt a spare set of carbs for my 67.5 1600
> a couple of weeks ago and installed them. I used
> Tom's Tech Tips on tuning but couldn't get the
> carbs to adjust correctly. I finally got them
> close, but the float levels were different by over
> 1/8". Using the O2 sensor everything seemed to be
> fine, so off to Austin I went (30 miles). By the
> time I reached Austin the car was running on 2 cyl,
> not a good sign!
>
> Limped home and hit the carbs again. I couldn't get
> them to work correctly, no matter what I did.
>
> A call to Tom, telling him about the different float
> levels and the symptoms produced the following statement
> from Tom: "Hmm you don't have a dirt dauber nest in the
> vent line on one of the carbs, do you?" I assured him
> that I had vatted everything and had blown everything
> out, and, besides, the vent lines had been on the other
> carbs that ran rather well just before the swap. He said
> that he had no idea, so there I was back at square one.
>
> I decided to start from scratch and check everything. I
> set the fuel levels the same, jsut below the jet, set the
> jet adjustment 2 turns down and started the engine again.
> Fuel poured out of the throat of the front carb, the one
> that I had to set low so that I could get any adjustment
> on. After much checking I decided to revisit Tom's comment.
> Blowing through the vent/overflow tube from the front carb
> showed a blockage! Sticking a wire through produced the
> beginnings of a dirt dauber nest! After removing it the
> carbs were up and running fine in less than 10 minutes!
>
> Tom, with your skills in diagnosing things I think you
> could make a bunch more money than Motorola pays you by
> just sitting around and diagnosing our Roadster problems
> long distance for a fee!
>
> Thanks for your help.
>
> Peace,
> Pat
>
>
>
>
> --
> - Support Habitat for Humanity, A "hand up", not a "hand out" -
> Pat Horne, Network Manager, Shop Supervisor, Hardware Guru
> CS Dept, University of Texas, Austin, Tx. 78712 USA
> voice (512)471-9517, fax (512)471-8885, UUCP:cs.utexas.edu!horne
>
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