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

[CEE VILL]

Hey Dean,

>From your picture, it appears the fuel line is fastened to a 90 degree elbow at the carb (block side).  If there is enough space between the carb and the block, unhook the line, then remove the brass elbow from the carburetor.  Many times there is a very fine filter screen fastened into the inner end of this elbow.  It may be about 3/4 inch long, so bring the elbow straight out away from the carb so you do not crush the screen.  This is like a final filter in the original system.  If clogged, it will shut off suppply just as you describe.  If it is too close to the block, you may have to remove the carburetor to clean the screen.  I spray the screen with gumout carburator cleaner, then blow it well with compressed air.  To inspect, hold it up to a light source (like the sky ((girn))) and make sure you can see through it. You can also spray some gumout into the carb and let it soak a few minutes while the line is unhooked.  From time to time I also may take out the adjustment screw and spray cleaner into the carb through that hole as well with problem such as yours.  

Good luck,

Charlie V, in WNY  

 

> 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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