[AT] Case VAH won't run; carb issues

[Ken Knierim]

Hey Dean,
   Do you have a fuel filter on it someplace? My guess is there may
have been some rust in the tank and sloshing fuel in it stirred the
bottom up and chased it down the fuel line. I've done this on my
Case's before and put a filter on them. Gotta be careful to keep it
clean though because they don't like any pressure drop across a
plugged up filter either (I run with minimal fuel in the tank).

Hope this helps

Ken in AZ


On Tue, Jun 23, 2009 at 8:24 PM, Dean Vinson<dean at vinsonfarm.net> wrote:
> I was up at my dad's farm last weekend and continued tinkering with the old
> VAH.  This is the tractor we had when I was a kid, and which I bought back
> in 2006 about 20 years after my dad sold it.  It's still up at the farm and
> I haven't made many trips up there to work on it, so don't know much about
> its recent history.
>
> When I first brought it back to the farm in 2006 it started and ran very
> well, but it hasn't run since sometime in 2008 I guess, not really sure when
> the last time was.
>
> On my last two visits, a few months ago and just this past weekend, I
> disassembled, cleaned, and reassembled the sediment bowl and fuel line, and
> there's a good fast flow of fuel through the line when it's disconnected
> from the carburetor.  Put new gas in the tank, which had been very very low,
> maybe empty.  Disassembled and cleaned the air cleaner.  In the process
> discovered the air cleaner was mounted too low in its vertical adjustment
> range, causing the air pipe to be about 1/4" out of alignment with the carb
> intake pipe, which over some long number of years had reduced the rubber
> connecting hose to a twisted rotten oily mess.  Fixed all that stuff.
> Confirmed that there's a good spark, and that there's a reason to be careful
> with your finger placement when testing for spark.  Cleaned off the exterior
> of the carburetor, but haven't opened it up.
>
> After all that, the tractor will start right off and run great for a second
> or two, then die and won't fire again until some more time passes.  I
> fiddled with the main jet and idle adjustment screws but couldn't get it to
> do any better.  So my theory is that something is clogging the carburetor,
> and the next step is to take it to a shop for a rebuild or to try a
> maintenance kit myself.
>
> Any recommendations?  It's a Marvel-Schebler TSX-597.  There's an
> in-progress photo at
> http://www.vinsonfarm.net/photos/Case_VAH_carburetor.jpg.
>
> Thanks--
>
> Dean Vinson
> Dayton, Ohio
> www.vinsonfarm.net
>
>
>
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