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

[Gene Dotson]

    Dean;
    In relation to Charlie's post, Case does not use a bronze filter at the 
carb inlet.
    First try removing the drain plug or petcock drain in the bottom of the 
carburetor and with a clean rag, catch the gas as it comes out and check for 
sediment. Next turn on the fuel at the tank and observe the flow from the 
carb drain. Should have an even flow from the drain. If not, then possibly a 
restriction at the tank outlet.
    As Charlie said, these carburetors are easy to work on. I was at my 
local Tractor Supply store yesterday and noticed they now carry carb kits 
and floats for this carburetor. They also have new sediment bowls and gasket 
and screen sets for most older tractors. Ignition parts too.
    If I had the carb here, I would gladly clean it for you. Easy half hour 
project.
    It is also possible that you have a bad condenser in the distributor 
also. They will often give the same symptons as you describe. Check your 
point gap. Should be at .020.
    Good luck

                                    Gene





> From: dean at vinsonfarm.net
> To: at at lists.antique-tractor.com
> Date: Tue, 23 Jun 2009 23:24:58 -0400
> Subject: [AT] Case VAH won't run; carb issues
>
> 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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